"""OpenAI chat wrapper."""

from __future__ import annotations

import base64
import json
import logging
import os
import re
import ssl
import sys
import warnings
from collections.abc import AsyncIterator, Iterator, Mapping, Sequence
from functools import partial
from io import BytesIO
from json import JSONDecodeError
from math import ceil
from operator import itemgetter
from typing import (
    TYPE_CHECKING,
    Any,
    Callable,
    Literal,
    Optional,
    TypedDict,
    TypeVar,
    Union,
    cast,
)
from urllib.parse import urlparse

import certifi
import openai
import tiktoken
from langchain_core._api.deprecation import deprecated
from langchain_core.callbacks import (
    AsyncCallbackManagerForLLMRun,
    CallbackManagerForLLMRun,
)
from langchain_core.language_models import LanguageModelInput
from langchain_core.language_models.chat_models import (
    BaseChatModel,
    LangSmithParams,
    agenerate_from_stream,
    generate_from_stream,
)
from langchain_core.messages import (
    AIMessage,
    AIMessageChunk,
    BaseMessage,
    BaseMessageChunk,
    ChatMessage,
    ChatMessageChunk,
    FunctionMessage,
    FunctionMessageChunk,
    HumanMessage,
    HumanMessageChunk,
    InvalidToolCall,
    SystemMessage,
    SystemMessageChunk,
    ToolCall,
    ToolMessage,
    ToolMessageChunk,
    convert_to_openai_data_block,
    is_data_content_block,
)
from langchain_core.messages.ai import (
    InputTokenDetails,
    OutputTokenDetails,
    UsageMetadata,
)
from langchain_core.messages.tool import tool_call_chunk
from langchain_core.output_parsers import JsonOutputParser, PydanticOutputParser
from langchain_core.output_parsers.openai_tools import (
    JsonOutputKeyToolsParser,
    PydanticToolsParser,
    make_invalid_tool_call,
    parse_tool_call,
)
from langchain_core.outputs import ChatGeneration, ChatGenerationChunk, ChatResult
from langchain_core.runnables import (
    Runnable,
    RunnableLambda,
    RunnableMap,
    RunnablePassthrough,
)
from langchain_core.runnables.config import run_in_executor
from langchain_core.tools import BaseTool
from langchain_core.tools.base import _stringify
from langchain_core.utils import get_pydantic_field_names
from langchain_core.utils.function_calling import (
    convert_to_openai_function,
    convert_to_openai_tool,
)
from langchain_core.utils.pydantic import (
    PydanticBaseModel,
    TypeBaseModel,
    is_basemodel_subclass,
)
from langchain_core.utils.utils import _build_model_kwargs, from_env, secret_from_env
from pydantic import BaseModel, ConfigDict, Field, SecretStr, model_validator
from pydantic.v1 import BaseModel as BaseModelV1
from typing_extensions import Self

if TYPE_CHECKING:
    from openai.types.responses import Response

logger = logging.getLogger(__name__)

# This SSL context is equivelent to the default `verify=True`.
# https://www.python-httpx.org/advanced/ssl/#configuring-client-instances
global_ssl_context = ssl.create_default_context(cafile=certifi.where())

_FUNCTION_CALL_IDS_MAP_KEY = "__openai_function_call_ids__"


def _convert_dict_to_message(_dict: Mapping[str, Any]) -> BaseMessage:
    """Convert a dictionary to a LangChain message.

    Args:
        _dict: The dictionary.

    Returns:
        The LangChain message.
    """
    role = _dict.get("role")
    name = _dict.get("name")
    id_ = _dict.get("id")
    if role == "user":
        return HumanMessage(content=_dict.get("content", ""), id=id_, name=name)
    elif role == "assistant":
        # Fix for azure
        # Also OpenAI returns None for tool invocations
        content = _dict.get("content", "") or ""
        additional_kwargs: dict = {}
        if function_call := _dict.get("function_call"):
            additional_kwargs["function_call"] = dict(function_call)
        tool_calls = []
        invalid_tool_calls = []
        if raw_tool_calls := _dict.get("tool_calls"):
            additional_kwargs["tool_calls"] = raw_tool_calls
            for raw_tool_call in raw_tool_calls:
                try:
                    tool_calls.append(parse_tool_call(raw_tool_call, return_id=True))
                except Exception as e:
                    invalid_tool_calls.append(
                        make_invalid_tool_call(raw_tool_call, str(e))
                    )
        if audio := _dict.get("audio"):
            additional_kwargs["audio"] = audio
        return AIMessage(
            content=content,
            additional_kwargs=additional_kwargs,
            name=name,
            id=id_,
            tool_calls=tool_calls,
            invalid_tool_calls=invalid_tool_calls,
        )
    elif role in ("system", "developer"):
        if role == "developer":
            additional_kwargs = {"__openai_role__": role}
        else:
            additional_kwargs = {}
        return SystemMessage(
            content=_dict.get("content", ""),
            name=name,
            id=id_,
            additional_kwargs=additional_kwargs,
        )
    elif role == "function":
        return FunctionMessage(
            content=_dict.get("content", ""), name=cast(str, _dict.get("name")), id=id_
        )
    elif role == "tool":
        additional_kwargs = {}
        if "name" in _dict:
            additional_kwargs["name"] = _dict["name"]
        return ToolMessage(
            content=_dict.get("content", ""),
            tool_call_id=cast(str, _dict.get("tool_call_id")),
            additional_kwargs=additional_kwargs,
            name=name,
            id=id_,
        )
    else:
        return ChatMessage(content=_dict.get("content", ""), role=role, id=id_)  # type: ignore[arg-type]


def _format_message_content(content: Any) -> Any:
    """Format message content."""
    if content and isinstance(content, list):
        formatted_content = []
        for block in content:
            # Remove unexpected block types
            if (
                isinstance(block, dict)
                and "type" in block
                and block["type"] in ("tool_use", "thinking", "reasoning_content")
            ):
                continue
            elif isinstance(block, dict) and is_data_content_block(block):
                formatted_content.append(convert_to_openai_data_block(block))
            # Anthropic image blocks
            elif (
                isinstance(block, dict)
                and block.get("type") == "image"
                and (source := block.get("source"))
                and isinstance(source, dict)
            ):
                if source.get("type") == "base64" and (
                    (media_type := source.get("media_type"))
                    and (data := source.get("data"))
                ):
                    formatted_content.append(
                        {
                            "type": "image_url",
                            "image_url": {"url": f"data:{media_type};base64,{data}"},
                        }
                    )
                elif source.get("type") == "url" and (url := source.get("url")):
                    formatted_content.append(
                        {"type": "image_url", "image_url": {"url": url}}
                    )
                else:
                    continue
            else:
                formatted_content.append(block)
    else:
        formatted_content = content

    return formatted_content


def _convert_message_to_dict(message: BaseMessage) -> dict:
    """Convert a LangChain message to a dictionary.

    Args:
        message: The LangChain message.

    Returns:
        The dictionary.
    """
    message_dict: dict[str, Any] = {"content": _format_message_content(message.content)}
    if (name := message.name or message.additional_kwargs.get("name")) is not None:
        message_dict["name"] = name

    # populate role and additional message data
    if isinstance(message, ChatMessage):
        message_dict["role"] = message.role
    elif isinstance(message, HumanMessage):
        message_dict["role"] = "user"
    elif isinstance(message, AIMessage):
        message_dict["role"] = "assistant"
        if message.tool_calls or message.invalid_tool_calls:
            message_dict["tool_calls"] = [
                _lc_tool_call_to_openai_tool_call(tc) for tc in message.tool_calls
            ] + [
                _lc_invalid_tool_call_to_openai_tool_call(tc)
                for tc in message.invalid_tool_calls
            ]
        elif "tool_calls" in message.additional_kwargs:
            message_dict["tool_calls"] = message.additional_kwargs["tool_calls"]
            tool_call_supported_props = {"id", "type", "function"}
            message_dict["tool_calls"] = [
                {k: v for k, v in tool_call.items() if k in tool_call_supported_props}
                for tool_call in message_dict["tool_calls"]
            ]
        elif "function_call" in message.additional_kwargs:
            # OpenAI raises 400 if both function_call and tool_calls are present in the
            # same message.
            message_dict["function_call"] = message.additional_kwargs["function_call"]
        else:
            pass
        # If tool calls present, content null value should be None not empty string.
        if "function_call" in message_dict or "tool_calls" in message_dict:
            message_dict["content"] = message_dict["content"] or None

        if "audio" in message.additional_kwargs:
            # openai doesn't support passing the data back - only the id
            # https://platform.openai.com/docs/guides/audio/multi-turn-conversations
            raw_audio = message.additional_kwargs["audio"]
            audio = (
                {"id": message.additional_kwargs["audio"]["id"]}
                if "id" in raw_audio
                else raw_audio
            )
            message_dict["audio"] = audio
    elif isinstance(message, SystemMessage):
        message_dict["role"] = message.additional_kwargs.get(
            "__openai_role__", "system"
        )
    elif isinstance(message, FunctionMessage):
        message_dict["role"] = "function"
    elif isinstance(message, ToolMessage):
        message_dict["role"] = "tool"
        message_dict["tool_call_id"] = message.tool_call_id

        supported_props = {"content", "role", "tool_call_id"}
        message_dict = {k: v for k, v in message_dict.items() if k in supported_props}
    else:
        raise TypeError(f"Got unknown type {message}")
    return message_dict


def _convert_delta_to_message_chunk(
    _dict: Mapping[str, Any], default_class: type[BaseMessageChunk]
) -> BaseMessageChunk:
    id_ = _dict.get("id")
    role = cast(str, _dict.get("role"))
    content = cast(str, _dict.get("content") or "")
    additional_kwargs: dict = {}
    if _dict.get("function_call"):
        function_call = dict(_dict["function_call"])
        if "name" in function_call and function_call["name"] is None:
            function_call["name"] = ""
        additional_kwargs["function_call"] = function_call
    tool_call_chunks = []
    if raw_tool_calls := _dict.get("tool_calls"):
        additional_kwargs["tool_calls"] = raw_tool_calls
        try:
            tool_call_chunks = [
                tool_call_chunk(
                    name=rtc["function"].get("name"),
                    args=rtc["function"].get("arguments"),
                    id=rtc.get("id"),
                    index=rtc["index"],
                )
                for rtc in raw_tool_calls
            ]
        except KeyError:
            pass

    if role == "user" or default_class == HumanMessageChunk:
        return HumanMessageChunk(content=content, id=id_)
    elif role == "assistant" or default_class == AIMessageChunk:
        return AIMessageChunk(
            content=content,
            additional_kwargs=additional_kwargs,
            id=id_,
            tool_call_chunks=tool_call_chunks,  # type: ignore[arg-type]
        )
    elif role in ("system", "developer") or default_class == SystemMessageChunk:
        if role == "developer":
            additional_kwargs = {"__openai_role__": "developer"}
        else:
            additional_kwargs = {}
        return SystemMessageChunk(
            content=content, id=id_, additional_kwargs=additional_kwargs
        )
    elif role == "function" or default_class == FunctionMessageChunk:
        return FunctionMessageChunk(content=content, name=_dict["name"], id=id_)
    elif role == "tool" or default_class == ToolMessageChunk:
        return ToolMessageChunk(
            content=content, tool_call_id=_dict["tool_call_id"], id=id_
        )
    elif role or default_class == ChatMessageChunk:
        return ChatMessageChunk(content=content, role=role, id=id_)
    else:
        return default_class(content=content, id=id_)  # type: ignore


def _update_token_usage(
    overall_token_usage: Union[int, dict], new_usage: Union[int, dict]
) -> Union[int, dict]:
    # Token usage is either ints or dictionaries
    # `reasoning_tokens` is nested inside `completion_tokens_details`
    if isinstance(new_usage, int):
        if not isinstance(overall_token_usage, int):
            raise ValueError(
                f"Got different types for token usage: "
                f"{type(new_usage)} and {type(overall_token_usage)}"
            )
        return new_usage + overall_token_usage
    elif isinstance(new_usage, dict):
        if not isinstance(overall_token_usage, dict):
            raise ValueError(
                f"Got different types for token usage: "
                f"{type(new_usage)} and {type(overall_token_usage)}"
            )
        return {
            k: _update_token_usage(overall_token_usage.get(k, 0), v)
            for k, v in new_usage.items()
        }
    else:
        warnings.warn(f"Unexpected type for token usage: {type(new_usage)}")
        return new_usage


def _handle_openai_bad_request(e: openai.BadRequestError) -> None:
    if (
        "'response_format' of type 'json_schema' is not supported with this model"
    ) in e.message:
        message = (
            "This model does not support OpenAI's structured output feature, which "
            "is the default method for `with_structured_output` as of "
            "langchain-openai==0.3. To use `with_structured_output` with this model, "
            'specify `method="function_calling"`.'
        )
        warnings.warn(message)
        raise e
    elif "Invalid schema for response_format" in e.message:
        message = (
            "Invalid schema for OpenAI's structured output feature, which is the "
            "default method for `with_structured_output` as of langchain-openai==0.3. "
            'Specify `method="function_calling"` instead or update your schema. '
            "See supported schemas: "
            "https://platform.openai.com/docs/guides/structured-outputs#supported-schemas"  # noqa: E501
        )
        warnings.warn(message)
        raise e
    else:
        raise


class _FunctionCall(TypedDict):
    name: str


_BM = TypeVar("_BM", bound=BaseModel)
_DictOrPydanticClass = Union[dict[str, Any], type[_BM], type]
_DictOrPydantic = Union[dict, _BM]


class _AllReturnType(TypedDict):
    raw: BaseMessage
    parsed: Optional[_DictOrPydantic]
    parsing_error: Optional[BaseException]


class BaseChatOpenAI(BaseChatModel):
    client: Any = Field(default=None, exclude=True)  #: :meta private:
    async_client: Any = Field(default=None, exclude=True)  #: :meta private:
    root_client: Any = Field(default=None, exclude=True)  #: :meta private:
    root_async_client: Any = Field(default=None, exclude=True)  #: :meta private:
    model_name: str = Field(default="gpt-3.5-turbo", alias="model")
    """Model name to use."""
    temperature: Optional[float] = None
    """What sampling temperature to use."""
    model_kwargs: dict[str, Any] = Field(default_factory=dict)
    """Holds any model parameters valid for `create` call not explicitly specified."""
    openai_api_key: Optional[SecretStr] = Field(
        alias="api_key", default_factory=secret_from_env("OPENAI_API_KEY", default=None)
    )
    openai_api_base: Optional[str] = Field(default=None, alias="base_url")
    """Base URL path for API requests, leave blank if not using a proxy or service 
        emulator."""
    openai_organization: Optional[str] = Field(default=None, alias="organization")
    """Automatically inferred from env var `OPENAI_ORG_ID` if not provided."""
    # to support explicit proxy for OpenAI
    openai_proxy: Optional[str] = Field(
        default_factory=from_env("OPENAI_PROXY", default=None)
    )
    request_timeout: Union[float, tuple[float, float], Any, None] = Field(
        default=None, alias="timeout"
    )
    """Timeout for requests to OpenAI completion API. Can be float, httpx.Timeout or 
        None."""
    stream_usage: bool = False
    """Whether to include usage metadata in streaming output. If True, an additional
    message chunk will be generated during the stream including usage metadata.

    .. versionadded:: 0.3.9
    """
    max_retries: Optional[int] = None
    """Maximum number of retries to make when generating."""
    presence_penalty: Optional[float] = None
    """Penalizes repeated tokens."""
    frequency_penalty: Optional[float] = None
    """Penalizes repeated tokens according to frequency."""
    seed: Optional[int] = None
    """Seed for generation"""
    logprobs: Optional[bool] = None
    """Whether to return logprobs."""
    top_logprobs: Optional[int] = None
    """Number of most likely tokens to return at each token position, each with
     an associated log probability. `logprobs` must be set to true 
     if this parameter is used."""
    logit_bias: Optional[dict[int, int]] = None
    """Modify the likelihood of specified tokens appearing in the completion."""
    streaming: bool = False
    """Whether to stream the results or not."""
    n: Optional[int] = None
    """Number of chat completions to generate for each prompt."""
    top_p: Optional[float] = None
    """Total probability mass of tokens to consider at each step."""
    max_tokens: Optional[int] = Field(default=None)
    """Maximum number of tokens to generate."""
    reasoning_effort: Optional[str] = None
    """Constrains effort on reasoning for reasoning models. 
    
    Reasoning models only, like OpenAI o1 and o3-mini.

    Currently supported values are low, medium, and high. Reducing reasoning effort 
    can result in faster responses and fewer tokens used on reasoning in a response.
    
    .. versionadded:: 0.2.14
    """
    tiktoken_model_name: Optional[str] = None
    """The model name to pass to tiktoken when using this class. 
    Tiktoken is used to count the number of tokens in documents to constrain 
    them to be under a certain limit. By default, when set to None, this will 
    be the same as the embedding model name. However, there are some cases 
    where you may want to use this Embedding class with a model name not 
    supported by tiktoken. This can include when using Azure embeddings or 
    when using one of the many model providers that expose an OpenAI-like 
    API but with different models. In those cases, in order to avoid erroring 
    when tiktoken is called, you can specify a model name to use here."""
    default_headers: Union[Mapping[str, str], None] = None
    default_query: Union[Mapping[str, object], None] = None
    # Configure a custom httpx client. See the
    # [httpx documentation](https://www.python-httpx.org/api/#client) for more details.
    http_client: Union[Any, None] = Field(default=None, exclude=True)
    """Optional httpx.Client. Only used for sync invocations. Must specify 
        http_async_client as well if you'd like a custom client for async invocations.
    """
    http_async_client: Union[Any, None] = Field(default=None, exclude=True)
    """Optional httpx.AsyncClient. Only used for async invocations. Must specify 
        http_client as well if you'd like a custom client for sync invocations."""
    stop: Optional[Union[list[str], str]] = Field(default=None, alias="stop_sequences")
    """Default stop sequences."""
    extra_body: Optional[Mapping[str, Any]] = None
    """Optional additional JSON properties to include in the request parameters when
    making requests to OpenAI compatible APIs, such as vLLM."""
    include_response_headers: bool = False
    """Whether to include response headers in the output message response_metadata."""
    disabled_params: Optional[dict[str, Any]] = Field(default=None)
    """Parameters of the OpenAI client or chat.completions endpoint that should be 
    disabled for the given model.
    
    Should be specified as ``{"param": None | ['val1', 'val2']}`` where the key is the 
    parameter and the value is either None, meaning that parameter should never be
    used, or it's a list of disabled values for the parameter.
    
    For example, older models may not support the 'parallel_tool_calls' parameter at 
    all, in which case ``disabled_params={"parallel_tool_calls": None}`` can be passed 
    in.
    
    If a parameter is disabled then it will not be used by default in any methods, e.g.
    in :meth:`~langchain_openai.chat_models.base.ChatOpenAI.with_structured_output`.
    However this does not prevent a user from directly passed in the parameter during
    invocation. 
    """
    service_tier: Optional[str] = None
    """Latency tier for request. Options are 'auto', 'default', or 'flex'. Relevant
    for users of OpenAI's scale tier service.
    """

    use_responses_api: Optional[bool] = None
    """Whether to use the Responses API instead of the Chat API.

    If not specified then will be inferred based on invocation params.

    .. versionadded:: 0.3.9
    """

    model_config = ConfigDict(populate_by_name=True)

    @model_validator(mode="before")
    @classmethod
    def build_extra(cls, values: dict[str, Any]) -> Any:
        """Build extra kwargs from additional params that were passed in."""
        all_required_field_names = get_pydantic_field_names(cls)
        values = _build_model_kwargs(values, all_required_field_names)
        return values

    @model_validator(mode="before")
    @classmethod
    def validate_temperature(cls, values: dict[str, Any]) -> Any:
        """Currently o1 models only allow temperature=1."""
        model = values.get("model_name") or values.get("model") or ""
        if model.startswith("o1") and "temperature" not in values:
            values["temperature"] = 1
        return values

    @model_validator(mode="after")
    def validate_environment(self) -> Self:
        """Validate that api key and python package exists in environment."""
        if self.n is not None and self.n < 1:
            raise ValueError("n must be at least 1.")
        elif self.n is not None and self.n > 1 and self.streaming:
            raise ValueError("n must be 1 when streaming.")

        # Check OPENAI_ORGANIZATION for backwards compatibility.
        self.openai_organization = (
            self.openai_organization
            or os.getenv("OPENAI_ORG_ID")
            or os.getenv("OPENAI_ORGANIZATION")
        )
        self.openai_api_base = self.openai_api_base or os.getenv("OPENAI_API_BASE")
        client_params: dict = {
            "api_key": (
                self.openai_api_key.get_secret_value() if self.openai_api_key else None
            ),
            "organization": self.openai_organization,
            "base_url": self.openai_api_base,
            "timeout": self.request_timeout,
            "default_headers": self.default_headers,
            "default_query": self.default_query,
        }
        if self.max_retries is not None:
            client_params["max_retries"] = self.max_retries

        if self.openai_proxy and (self.http_client or self.http_async_client):
            openai_proxy = self.openai_proxy
            http_client = self.http_client
            http_async_client = self.http_async_client
            raise ValueError(
                "Cannot specify 'openai_proxy' if one of "
                "'http_client'/'http_async_client' is already specified. Received:\n"
                f"{openai_proxy=}\n{http_client=}\n{http_async_client=}"
            )
        if not self.client:
            if self.openai_proxy and not self.http_client:
                try:
                    import httpx
                except ImportError as e:
                    raise ImportError(
                        "Could not import httpx python package. "
                        "Please install it with `pip install httpx`."
                    ) from e
                self.http_client = httpx.Client(
                    proxy=self.openai_proxy, verify=global_ssl_context
                )
            sync_specific = {"http_client": self.http_client}
            self.root_client = openai.OpenAI(**client_params, **sync_specific)  # type: ignore[arg-type]
            self.client = self.root_client.chat.completions
        if not self.async_client:
            if self.openai_proxy and not self.http_async_client:
                try:
                    import httpx
                except ImportError as e:
                    raise ImportError(
                        "Could not import httpx python package. "
                        "Please install it with `pip install httpx`."
                    ) from e
                self.http_async_client = httpx.AsyncClient(
                    proxy=self.openai_proxy, verify=global_ssl_context
                )
            async_specific = {"http_client": self.http_async_client}
            self.root_async_client = openai.AsyncOpenAI(
                **client_params,
                **async_specific,  # type: ignore[arg-type]
            )
            self.async_client = self.root_async_client.chat.completions
        return self

    @property
    def _default_params(self) -> dict[str, Any]:
        """Get the default parameters for calling OpenAI API."""
        exclude_if_none = {
            "presence_penalty": self.presence_penalty,
            "frequency_penalty": self.frequency_penalty,
            "seed": self.seed,
            "top_p": self.top_p,
            "logprobs": self.logprobs,
            "top_logprobs": self.top_logprobs,
            "logit_bias": self.logit_bias,
            "stop": self.stop or None,  # also exclude empty list for this
            "max_tokens": self.max_tokens,
            "extra_body": self.extra_body,
            "n": self.n,
            "temperature": self.temperature,
            "reasoning_effort": self.reasoning_effort,
            "service_tier": self.service_tier,
        }

        params = {
            "model": self.model_name,
            "stream": self.streaming,
            **{k: v for k, v in exclude_if_none.items() if v is not None},
            **self.model_kwargs,
        }

        return params

    def _combine_llm_outputs(self, llm_outputs: list[Optional[dict]]) -> dict:
        overall_token_usage: dict = {}
        system_fingerprint = None
        for output in llm_outputs:
            if output is None:
                # Happens in streaming
                continue
            token_usage = output.get("token_usage")
            if token_usage is not None:
                for k, v in token_usage.items():
                    if v is None:
                        continue
                    if k in overall_token_usage:
                        overall_token_usage[k] = _update_token_usage(
                            overall_token_usage[k], v
                        )
                    else:
                        overall_token_usage[k] = v
            if system_fingerprint is None:
                system_fingerprint = output.get("system_fingerprint")
        combined = {"token_usage": overall_token_usage, "model_name": self.model_name}
        if system_fingerprint:
            combined["system_fingerprint"] = system_fingerprint
        return combined

    def _convert_chunk_to_generation_chunk(
        self,
        chunk: dict,
        default_chunk_class: type,
        base_generation_info: Optional[dict],
    ) -> Optional[ChatGenerationChunk]:
        if chunk.get("type") == "content.delta":  # from beta.chat.completions.stream
            return None
        token_usage = chunk.get("usage")
        choices = (
            chunk.get("choices", [])
            # from beta.chat.completions.stream
            or chunk.get("chunk", {}).get("choices", [])
        )

        usage_metadata: Optional[UsageMetadata] = (
            _create_usage_metadata(token_usage) if token_usage else None
        )
        if len(choices) == 0:
            # logprobs is implicitly None
            generation_chunk = ChatGenerationChunk(
                message=default_chunk_class(content="", usage_metadata=usage_metadata)
            )
            return generation_chunk

        choice = choices[0]
        if choice["delta"] is None:
            return None

        message_chunk = _convert_delta_to_message_chunk(
            choice["delta"], default_chunk_class
        )
        generation_info = {**base_generation_info} if base_generation_info else {}

        if finish_reason := choice.get("finish_reason"):
            generation_info["finish_reason"] = finish_reason
            if model_name := chunk.get("model"):
                generation_info["model_name"] = model_name
            if system_fingerprint := chunk.get("system_fingerprint"):
                generation_info["system_fingerprint"] = system_fingerprint
            if service_tier := chunk.get("service_tier"):
                generation_info["service_tier"] = service_tier

        logprobs = choice.get("logprobs")
        if logprobs:
            generation_info["logprobs"] = logprobs

        if usage_metadata and isinstance(message_chunk, AIMessageChunk):
            message_chunk.usage_metadata = usage_metadata

        generation_chunk = ChatGenerationChunk(
            message=message_chunk, generation_info=generation_info or None
        )
        return generation_chunk

    def _stream_responses(
        self,
        messages: list[BaseMessage],
        stop: Optional[list[str]] = None,
        run_manager: Optional[CallbackManagerForLLMRun] = None,
        **kwargs: Any,
    ) -> Iterator[ChatGenerationChunk]:
        kwargs["stream"] = True
        payload = self._get_request_payload(messages, stop=stop, **kwargs)
        if self.include_response_headers:
            raw_context_manager = self.root_client.with_raw_response.responses.create(
                **payload
            )
            context_manager = raw_context_manager.parse()
            headers = {"headers": dict(raw_context_manager.headers)}
        else:
            context_manager = self.root_client.responses.create(**payload)
            headers = {}
        original_schema_obj = kwargs.get("response_format")

        with context_manager as response:
            is_first_chunk = True
            has_reasoning = False
            for chunk in response:
                metadata = headers if is_first_chunk else {}
                if generation_chunk := _convert_responses_chunk_to_generation_chunk(
                    chunk,
                    schema=original_schema_obj,
                    metadata=metadata,
                    has_reasoning=has_reasoning,
                ):
                    if run_manager:
                        run_manager.on_llm_new_token(
                            generation_chunk.text, chunk=generation_chunk
                        )
                    is_first_chunk = False
                    if "reasoning" in generation_chunk.message.additional_kwargs:
                        has_reasoning = True
                    yield generation_chunk

    async def _astream_responses(
        self,
        messages: list[BaseMessage],
        stop: Optional[list[str]] = None,
        run_manager: Optional[AsyncCallbackManagerForLLMRun] = None,
        **kwargs: Any,
    ) -> AsyncIterator[ChatGenerationChunk]:
        kwargs["stream"] = True
        payload = self._get_request_payload(messages, stop=stop, **kwargs)
        if self.include_response_headers:
            raw_context_manager = (
                await self.root_async_client.with_raw_response.responses.create(
                    **payload
                )
            )
            context_manager = raw_context_manager.parse()
            headers = {"headers": dict(raw_context_manager.headers)}
        else:
            context_manager = await self.root_async_client.responses.create(**payload)
            headers = {}
        original_schema_obj = kwargs.get("response_format")

        async with context_manager as response:
            is_first_chunk = True
            has_reasoning = False
            async for chunk in response:
                metadata = headers if is_first_chunk else {}
                if generation_chunk := _convert_responses_chunk_to_generation_chunk(
                    chunk,
                    schema=original_schema_obj,
                    metadata=metadata,
                    has_reasoning=has_reasoning,
                ):
                    if run_manager:
                        await run_manager.on_llm_new_token(
                            generation_chunk.text, chunk=generation_chunk
                        )
                    is_first_chunk = False
                    if "reasoning" in generation_chunk.message.additional_kwargs:
                        has_reasoning = True
                    yield generation_chunk

    def _should_stream_usage(
        self, stream_usage: Optional[bool] = None, **kwargs: Any
    ) -> bool:
        """Determine whether to include usage metadata in streaming output.

        For backwards compatibility, we check for `stream_options` passed
        explicitly to kwargs or in the model_kwargs and override self.stream_usage.
        """
        stream_usage_sources = [  # order of precedence
            stream_usage,
            kwargs.get("stream_options", {}).get("include_usage"),
            self.model_kwargs.get("stream_options", {}).get("include_usage"),
            self.stream_usage,
        ]
        for source in stream_usage_sources:
            if isinstance(source, bool):
                return source
        return self.stream_usage

    def _stream(
        self,
        messages: list[BaseMessage],
        stop: Optional[list[str]] = None,
        run_manager: Optional[CallbackManagerForLLMRun] = None,
        *,
        stream_usage: Optional[bool] = None,
        **kwargs: Any,
    ) -> Iterator[ChatGenerationChunk]:
        kwargs["stream"] = True
        stream_usage = self._should_stream_usage(stream_usage, **kwargs)
        if stream_usage:
            kwargs["stream_options"] = {"include_usage": stream_usage}
        payload = self._get_request_payload(messages, stop=stop, **kwargs)
        default_chunk_class: type[BaseMessageChunk] = AIMessageChunk
        base_generation_info = {}

        if "response_format" in payload:
            if self.include_response_headers:
                warnings.warn(
                    "Cannot currently include response headers when response_format is "
                    "specified."
                )
            payload.pop("stream")
            response_stream = self.root_client.beta.chat.completions.stream(**payload)
            context_manager = response_stream
        else:
            if self.include_response_headers:
                raw_response = self.client.with_raw_response.create(**payload)
                response = raw_response.parse()
                base_generation_info = {"headers": dict(raw_response.headers)}
            else:
                response = self.client.create(**payload)
            context_manager = response
        try:
            with context_manager as response:
                is_first_chunk = True
                for chunk in response:
                    if not isinstance(chunk, dict):
                        chunk = chunk.model_dump()
                    generation_chunk = self._convert_chunk_to_generation_chunk(
                        chunk,
                        default_chunk_class,
                        base_generation_info if is_first_chunk else {},
                    )
                    if generation_chunk is None:
                        continue
                    default_chunk_class = generation_chunk.message.__class__
                    logprobs = (generation_chunk.generation_info or {}).get("logprobs")
                    if run_manager:
                        run_manager.on_llm_new_token(
                            generation_chunk.text,
                            chunk=generation_chunk,
                            logprobs=logprobs,
                        )
                    is_first_chunk = False
                    yield generation_chunk
        except openai.BadRequestError as e:
            _handle_openai_bad_request(e)
        if hasattr(response, "get_final_completion") and "response_format" in payload:
            final_completion = response.get_final_completion()
            generation_chunk = self._get_generation_chunk_from_completion(
                final_completion
            )
            if run_manager:
                run_manager.on_llm_new_token(
                    generation_chunk.text, chunk=generation_chunk
                )
            yield generation_chunk

    def _generate(
        self,
        messages: list[BaseMessage],
        stop: Optional[list[str]] = None,
        run_manager: Optional[CallbackManagerForLLMRun] = None,
        **kwargs: Any,
    ) -> ChatResult:
        if self.streaming:
            stream_iter = self._stream(
                messages, stop=stop, run_manager=run_manager, **kwargs
            )
            return generate_from_stream(stream_iter)
        payload = self._get_request_payload(messages, stop=stop, **kwargs)
        generation_info = None
        if "response_format" in payload:
            if self.include_response_headers:
                warnings.warn(
                    "Cannot currently include response headers when response_format is "
                    "specified."
                )
            payload.pop("stream")
            try:
                response = self.root_client.beta.chat.completions.parse(**payload)
            except openai.BadRequestError as e:
                _handle_openai_bad_request(e)
        elif self._use_responses_api(payload):
            original_schema_obj = kwargs.get("response_format")
            if original_schema_obj and _is_pydantic_class(original_schema_obj):
                response = self.root_client.responses.parse(**payload)
            else:
                if self.include_response_headers:
                    raw_response = self.root_client.with_raw_response.responses.create(
                        **payload
                    )
                    response = raw_response.parse()
                    generation_info = {"headers": dict(raw_response.headers)}
                else:
                    response = self.root_client.responses.create(**payload)
            return _construct_lc_result_from_responses_api(
                response, schema=original_schema_obj, metadata=generation_info
            )
        elif self.include_response_headers:
            raw_response = self.client.with_raw_response.create(**payload)
            response = raw_response.parse()
            generation_info = {"headers": dict(raw_response.headers)}
        else:
            response = self.client.create(**payload)
        return self._create_chat_result(response, generation_info)

    def _use_responses_api(self, payload: dict) -> bool:
        if isinstance(self.use_responses_api, bool):
            return self.use_responses_api
        else:
            return _use_responses_api(payload)

    def _get_request_payload(
        self,
        input_: LanguageModelInput,
        *,
        stop: Optional[list[str]] = None,
        **kwargs: Any,
    ) -> dict:
        messages = self._convert_input(input_).to_messages()
        if stop is not None:
            kwargs["stop"] = stop

        payload = {**self._default_params, **kwargs}
        if self._use_responses_api(payload):
            payload = _construct_responses_api_payload(messages, payload)
        else:
            payload["messages"] = [_convert_message_to_dict(m) for m in messages]
        return payload

    def _create_chat_result(
        self,
        response: Union[dict, openai.BaseModel],
        generation_info: Optional[dict] = None,
    ) -> ChatResult:
        generations = []

        response_dict = (
            response if isinstance(response, dict) else response.model_dump()
        )
        # Sometimes the AI Model calling will get error, we should raise it.
        # Otherwise, the next code 'choices.extend(response["choices"])'
        # will throw a "TypeError: 'NoneType' object is not iterable" error
        # to mask the true error. Because 'response["choices"]' is None.
        if response_dict.get("error"):
            raise ValueError(response_dict.get("error"))

        token_usage = response_dict.get("usage")
        for res in response_dict["choices"]:
            message = _convert_dict_to_message(res["message"])
            if token_usage and isinstance(message, AIMessage):
                message.usage_metadata = _create_usage_metadata(token_usage)
            generation_info = generation_info or {}
            generation_info["finish_reason"] = (
                res.get("finish_reason")
                if res.get("finish_reason") is not None
                else generation_info.get("finish_reason")
            )
            if "logprobs" in res:
                generation_info["logprobs"] = res["logprobs"]
            gen = ChatGeneration(message=message, generation_info=generation_info)
            generations.append(gen)
        llm_output = {
            "token_usage": token_usage,
            "model_name": response_dict.get("model", self.model_name),
            "system_fingerprint": response_dict.get("system_fingerprint", ""),
        }
        if "id" in response_dict:
            llm_output["id"] = response_dict["id"]
        if "service_tier" in response_dict:
            llm_output["service_tier"] = response_dict["service_tier"]

        if isinstance(response, openai.BaseModel) and getattr(
            response, "choices", None
        ):
            message = response.choices[0].message  # type: ignore[attr-defined]
            if hasattr(message, "parsed"):
                generations[0].message.additional_kwargs["parsed"] = message.parsed
            if hasattr(message, "refusal"):
                generations[0].message.additional_kwargs["refusal"] = message.refusal

        return ChatResult(generations=generations, llm_output=llm_output)

    async def _astream(
        self,
        messages: list[BaseMessage],
        stop: Optional[list[str]] = None,
        run_manager: Optional[AsyncCallbackManagerForLLMRun] = None,
        *,
        stream_usage: Optional[bool] = None,
        **kwargs: Any,
    ) -> AsyncIterator[ChatGenerationChunk]:
        kwargs["stream"] = True
        stream_usage = self._should_stream_usage(stream_usage, **kwargs)
        if stream_usage:
            kwargs["stream_options"] = {"include_usage": stream_usage}
        payload = self._get_request_payload(messages, stop=stop, **kwargs)
        default_chunk_class: type[BaseMessageChunk] = AIMessageChunk
        base_generation_info = {}

        if "response_format" in payload:
            if self.include_response_headers:
                warnings.warn(
                    "Cannot currently include response headers when response_format is "
                    "specified."
                )
            payload.pop("stream")
            response_stream = self.root_async_client.beta.chat.completions.stream(
                **payload
            )
            context_manager = response_stream
        else:
            if self.include_response_headers:
                raw_response = await self.async_client.with_raw_response.create(
                    **payload
                )
                response = raw_response.parse()
                base_generation_info = {"headers": dict(raw_response.headers)}
            else:
                response = await self.async_client.create(**payload)
            context_manager = response
        try:
            async with context_manager as response:
                is_first_chunk = True
                async for chunk in response:
                    if not isinstance(chunk, dict):
                        chunk = chunk.model_dump()
                    generation_chunk = self._convert_chunk_to_generation_chunk(
                        chunk,
                        default_chunk_class,
                        base_generation_info if is_first_chunk else {},
                    )
                    if generation_chunk is None:
                        continue
                    default_chunk_class = generation_chunk.message.__class__
                    logprobs = (generation_chunk.generation_info or {}).get("logprobs")
                    if run_manager:
                        await run_manager.on_llm_new_token(
                            generation_chunk.text,
                            chunk=generation_chunk,
                            logprobs=logprobs,
                        )
                    is_first_chunk = False
                    yield generation_chunk
        except openai.BadRequestError as e:
            _handle_openai_bad_request(e)
        if hasattr(response, "get_final_completion") and "response_format" in payload:
            final_completion = await response.get_final_completion()
            generation_chunk = self._get_generation_chunk_from_completion(
                final_completion
            )
            if run_manager:
                await run_manager.on_llm_new_token(
                    generation_chunk.text, chunk=generation_chunk
                )
            yield generation_chunk

    async def _agenerate(
        self,
        messages: list[BaseMessage],
        stop: Optional[list[str]] = None,
        run_manager: Optional[AsyncCallbackManagerForLLMRun] = None,
        **kwargs: Any,
    ) -> ChatResult:
        if self.streaming:
            stream_iter = self._astream(
                messages, stop=stop, run_manager=run_manager, **kwargs
            )
            return await agenerate_from_stream(stream_iter)
        payload = self._get_request_payload(messages, stop=stop, **kwargs)
        generation_info = None
        if "response_format" in payload:
            if self.include_response_headers:
                warnings.warn(
                    "Cannot currently include response headers when response_format is "
                    "specified."
                )
            payload.pop("stream")
            try:
                response = await self.root_async_client.beta.chat.completions.parse(
                    **payload
                )
            except openai.BadRequestError as e:
                _handle_openai_bad_request(e)
        elif self._use_responses_api(payload):
            original_schema_obj = kwargs.get("response_format")
            if original_schema_obj and _is_pydantic_class(original_schema_obj):
                response = await self.root_async_client.responses.parse(**payload)
            else:
                if self.include_response_headers:
                    raw_response = (
                        await self.root_async_client.with_raw_response.responses.create(
                            **payload
                        )
                    )
                    response = raw_response.parse()
                    generation_info = {"headers": dict(raw_response.headers)}
                else:
                    response = await self.root_async_client.responses.create(**payload)
            return _construct_lc_result_from_responses_api(
                response, schema=original_schema_obj, metadata=generation_info
            )
        elif self.include_response_headers:
            raw_response = await self.async_client.with_raw_response.create(**payload)
            response = raw_response.parse()
            generation_info = {"headers": dict(raw_response.headers)}
        else:
            response = await self.async_client.create(**payload)
        return await run_in_executor(
            None, self._create_chat_result, response, generation_info
        )

    @property
    def _identifying_params(self) -> dict[str, Any]:
        """Get the identifying parameters."""
        return {"model_name": self.model_name, **self._default_params}

    def _get_invocation_params(
        self, stop: Optional[list[str]] = None, **kwargs: Any
    ) -> dict[str, Any]:
        """Get the parameters used to invoke the model."""
        params = {
            "model": self.model_name,
            **super()._get_invocation_params(stop=stop),
            **self._default_params,
            **kwargs,
        }
        # Redact headers from built-in remote MCP tool invocations
        if (tools := params.get("tools")) and isinstance(tools, list):
            params["tools"] = [
                ({**tool, "headers": "**REDACTED**"} if "headers" in tool else tool)
                if isinstance(tool, dict) and tool.get("type") == "mcp"
                else tool
                for tool in tools
            ]

        return params

    def _get_ls_params(
        self, stop: Optional[list[str]] = None, **kwargs: Any
    ) -> LangSmithParams:
        """Get standard params for tracing."""
        params = self._get_invocation_params(stop=stop, **kwargs)
        ls_params = LangSmithParams(
            ls_provider="openai",
            ls_model_name=self.model_name,
            ls_model_type="chat",
            ls_temperature=params.get("temperature", self.temperature),
        )
        if ls_max_tokens := params.get("max_tokens", self.max_tokens) or params.get(
            "max_completion_tokens", self.max_tokens
        ):
            ls_params["ls_max_tokens"] = ls_max_tokens
        if ls_stop := stop or params.get("stop", None):
            ls_params["ls_stop"] = ls_stop
        return ls_params

    @property
    def _llm_type(self) -> str:
        """Return type of chat model."""
        return "openai-chat"

    def _get_encoding_model(self) -> tuple[str, tiktoken.Encoding]:
        if self.tiktoken_model_name is not None:
            model = self.tiktoken_model_name
        else:
            model = self.model_name
        try:
            encoding = tiktoken.encoding_for_model(model)
        except KeyError:
            model = "cl100k_base"
            encoding = tiktoken.get_encoding(model)
        return model, encoding

    def get_token_ids(self, text: str) -> list[int]:
        """Get the tokens present in the text with tiktoken package."""
        if self.custom_get_token_ids is not None:
            return self.custom_get_token_ids(text)
        # tiktoken NOT supported for Python 3.7 or below
        if sys.version_info[1] <= 7:
            return super().get_token_ids(text)
        _, encoding_model = self._get_encoding_model()
        return encoding_model.encode(text)

    def get_num_tokens_from_messages(
        self,
        messages: list[BaseMessage],
        tools: Optional[
            Sequence[Union[dict[str, Any], type, Callable, BaseTool]]
        ] = None,
    ) -> int:
        """Calculate num tokens for gpt-3.5-turbo and gpt-4 with tiktoken package.

        **Requirements**: You must have the ``pillow`` installed if you want to count
        image tokens if you are specifying the image as a base64 string, and you must
        have both ``pillow`` and ``httpx`` installed if you are specifying the image
        as a URL. If these aren't installed image inputs will be ignored in token
        counting.

        OpenAI reference: https://github.com/openai/openai-cookbook/blob/
        main/examples/How_to_format_inputs_to_ChatGPT_models.ipynb

        Args:
            messages: The message inputs to tokenize.
            tools: If provided, sequence of dict, BaseModel, function, or BaseTools
                to be converted to tool schemas.
        """
        # TODO: Count bound tools as part of input.
        if tools is not None:
            warnings.warn(
                "Counting tokens in tool schemas is not yet supported. Ignoring tools."
            )
        if sys.version_info[1] <= 7:
            return super().get_num_tokens_from_messages(messages)
        model, encoding = self._get_encoding_model()
        if model.startswith("gpt-3.5-turbo-0301"):
            # every message follows <im_start>{role/name}\n{content}<im_end>\n
            tokens_per_message = 4
            # if there's a name, the role is omitted
            tokens_per_name = -1
        elif model.startswith("gpt-3.5-turbo") or model.startswith("gpt-4"):
            tokens_per_message = 3
            tokens_per_name = 1
        else:
            raise NotImplementedError(
                f"get_num_tokens_from_messages() is not presently implemented "
                f"for model {model}. See "
                "https://platform.openai.com/docs/guides/text-generation/managing-tokens"  # noqa: E501
                " for information on how messages are converted to tokens."
            )
        num_tokens = 0
        messages_dict = [_convert_message_to_dict(m) for m in messages]
        for message in messages_dict:
            num_tokens += tokens_per_message
            for key, value in message.items():
                # This is an inferred approximation. OpenAI does not document how to
                # count tool message tokens.
                if key == "tool_call_id":
                    num_tokens += 3
                    continue
                if isinstance(value, list):
                    # content or tool calls
                    for val in value:
                        if isinstance(val, str) or val["type"] == "text":
                            text = val["text"] if isinstance(val, dict) else val
                            num_tokens += len(encoding.encode(text))
                        elif val["type"] == "image_url":
                            if val["image_url"].get("detail") == "low":
                                num_tokens += 85
                            else:
                                image_size = _url_to_size(val["image_url"]["url"])
                                if not image_size:
                                    continue
                                num_tokens += _count_image_tokens(*image_size)
                        # Tool/function call token counting is not documented by OpenAI.
                        # This is an approximation.
                        elif val["type"] == "function":
                            num_tokens += len(
                                encoding.encode(val["function"]["arguments"])
                            )
                            num_tokens += len(encoding.encode(val["function"]["name"]))
                        elif val["type"] == "file":
                            warnings.warn(
                                "Token counts for file inputs are not supported. "
                                "Ignoring file inputs."
                            )
                            pass
                        else:
                            raise ValueError(
                                f"Unrecognized content block type\n\n{val}"
                            )
                elif not value:
                    continue
                else:
                    # Cast str(value) in case the message value is not a string
                    # This occurs with function messages
                    num_tokens += len(encoding.encode(str(value)))
                if key == "name":
                    num_tokens += tokens_per_name
        # every reply is primed with <im_start>assistant
        num_tokens += 3
        return num_tokens

    @deprecated(
        since="0.2.1",
        alternative="langchain_openai.chat_models.base.ChatOpenAI.bind_tools",
        removal="1.0.0",
    )
    def bind_functions(
        self,
        functions: Sequence[Union[dict[str, Any], type[BaseModel], Callable, BaseTool]],
        function_call: Optional[
            Union[_FunctionCall, str, Literal["auto", "none"]]
        ] = None,
        **kwargs: Any,
    ) -> Runnable[LanguageModelInput, BaseMessage]:
        """Bind functions (and other objects) to this chat model.

        Assumes model is compatible with OpenAI function-calling API.

        NOTE: Using bind_tools is recommended instead, as the `functions` and
            `function_call` request parameters are officially marked as deprecated by
            OpenAI.

        Args:
            functions: A list of function definitions to bind to this chat model.
                Can be  a dictionary, pydantic model, or callable. Pydantic
                models and callables will be automatically converted to
                their schema dictionary representation.
            function_call: Which function to require the model to call.
                Must be the name of the single provided function or
                "auto" to automatically determine which function to call
                (if any).
            **kwargs: Any additional parameters to pass to the
                :class:`~langchain.runnable.Runnable` constructor.
        """

        formatted_functions = [convert_to_openai_function(fn) for fn in functions]
        if function_call is not None:
            function_call = (
                {"name": function_call}
                if isinstance(function_call, str)
                and function_call not in ("auto", "none")
                else function_call
            )
            if isinstance(function_call, dict) and len(formatted_functions) != 1:
                raise ValueError(
                    "When specifying `function_call`, you must provide exactly one "
                    "function."
                )
            if (
                isinstance(function_call, dict)
                and formatted_functions[0]["name"] != function_call["name"]
            ):
                raise ValueError(
                    f"Function call {function_call} was specified, but the only "
                    f"provided function was {formatted_functions[0]['name']}."
                )
            kwargs = {**kwargs, "function_call": function_call}
        return super().bind(functions=formatted_functions, **kwargs)

    def bind_tools(
        self,
        tools: Sequence[Union[dict[str, Any], type, Callable, BaseTool]],
        *,
        tool_choice: Optional[
            Union[dict, str, Literal["auto", "none", "required", "any"], bool]
        ] = None,
        strict: Optional[bool] = None,
        parallel_tool_calls: Optional[bool] = None,
        **kwargs: Any,
    ) -> Runnable[LanguageModelInput, BaseMessage]:
        """Bind tool-like objects to this chat model.

        Assumes model is compatible with OpenAI tool-calling API.

        Args:
            tools: A list of tool definitions to bind to this chat model.
                Supports any tool definition handled by
                :meth:`langchain_core.utils.function_calling.convert_to_openai_tool`.
            tool_choice: Which tool to require the model to call. Options are:

                - str of the form ``"<<tool_name>>"``: calls <<tool_name>> tool.
                - ``"auto"``: automatically selects a tool (including no tool).
                - ``"none"``: does not call a tool.
                - ``"any"`` or ``"required"`` or ``True``: force at least one tool to be called.
                - dict of the form ``{"type": "function", "function": {"name": <<tool_name>>}}``: calls <<tool_name>> tool.
                - ``False`` or ``None``: no effect, default OpenAI behavior.
            strict: If True, model output is guaranteed to exactly match the JSON Schema
                provided in the tool definition. If True, the input schema will be
                validated according to
                https://platform.openai.com/docs/guides/structured-outputs/supported-schemas.
                If False, input schema will not be validated and model output will not
                be validated.
                If None, ``strict`` argument will not be passed to the model.
            parallel_tool_calls: Set to ``False`` to disable parallel tool use.
                Defaults to ``None`` (no specification, which allows parallel tool use).
            kwargs: Any additional parameters are passed directly to
                :meth:`~langchain_openai.chat_models.base.ChatOpenAI.bind`.

        .. versionchanged:: 0.1.21

            Support for ``strict`` argument added.

        """  # noqa: E501

        if parallel_tool_calls is not None:
            kwargs["parallel_tool_calls"] = parallel_tool_calls
        formatted_tools = [
            convert_to_openai_tool(tool, strict=strict) for tool in tools
        ]
        tool_names = []
        for tool in formatted_tools:
            if "function" in tool:
                tool_names.append(tool["function"]["name"])
            elif "name" in tool:
                tool_names.append(tool["name"])
            else:
                pass
        if tool_choice:
            if isinstance(tool_choice, str):
                # tool_choice is a tool/function name
                if tool_choice in tool_names:
                    tool_choice = {
                        "type": "function",
                        "function": {"name": tool_choice},
                    }
                elif tool_choice in (
                    "file_search",
                    "web_search_preview",
                    "computer_use_preview",
                    "code_interpreter",
                    "mcp",
                ):
                    tool_choice = {"type": tool_choice}
                # 'any' is not natively supported by OpenAI API.
                # We support 'any' since other models use this instead of 'required'.
                elif tool_choice == "any":
                    tool_choice = "required"
                else:
                    pass
            elif isinstance(tool_choice, bool):
                tool_choice = "required"
            elif isinstance(tool_choice, dict):
                pass
            else:
                raise ValueError(
                    f"Unrecognized tool_choice type. Expected str, bool or dict. "
                    f"Received: {tool_choice}"
                )
            kwargs["tool_choice"] = tool_choice
        return super().bind(tools=formatted_tools, **kwargs)

    def with_structured_output(
        self,
        schema: Optional[_DictOrPydanticClass] = None,
        *,
        method: Literal[
            "function_calling", "json_mode", "json_schema"
        ] = "function_calling",
        include_raw: bool = False,
        strict: Optional[bool] = None,
        tools: Optional[list] = None,
        **kwargs: Any,
    ) -> Runnable[LanguageModelInput, _DictOrPydantic]:
        """Model wrapper that returns outputs formatted to match the given schema.

        Args:
            schema:
                The output schema. Can be passed in as:

                - an OpenAI function/tool schema,
                - a JSON Schema,
                - a TypedDict class (support added in 0.1.20),
                - or a Pydantic class.

                If ``schema`` is a Pydantic class then the model output will be a
                Pydantic instance of that class, and the model-generated fields will be
                validated by the Pydantic class. Otherwise the model output will be a
                dict and will not be validated. See :meth:`langchain_core.utils.function_calling.convert_to_openai_tool`
                for more on how to properly specify types and descriptions of
                schema fields when specifying a Pydantic or TypedDict class.

            method: The method for steering model generation, one of:

                - "function_calling":
                    Uses OpenAI's tool-calling (formerly called function calling)
                    API: https://platform.openai.com/docs/guides/function-calling
                - "json_schema":
                    Uses OpenAI's Structured Output API: https://platform.openai.com/docs/guides/structured-outputs
                    Supported for "gpt-4o-mini", "gpt-4o-2024-08-06", "o1", and later
                    models.
                - "json_mode":
                    Uses OpenAI's JSON mode. Note that if using JSON mode then you
                    must include instructions for formatting the output into the
                    desired schema into the model call:
                    https://platform.openai.com/docs/guides/structured-outputs/json-mode

                Learn more about the differences between the methods and which models
                support which methods here:

                - https://platform.openai.com/docs/guides/structured-outputs/structured-outputs-vs-json-mode
                - https://platform.openai.com/docs/guides/structured-outputs/function-calling-vs-response-format

            include_raw:
                If False then only the parsed structured output is returned. If
                an error occurs during model output parsing it will be raised. If True
                then both the raw model response (a BaseMessage) and the parsed model
                response will be returned. If an error occurs during output parsing it
                will be caught and returned as well. The final output is always a dict
                with keys "raw", "parsed", and "parsing_error".
            strict:

                - True:
                    Model output is guaranteed to exactly match the schema.
                    The input schema will also be validated according to
                    https://platform.openai.com/docs/guides/structured-outputs/supported-schemas
                - False:
                    Input schema will not be validated and model output will not be
                    validated.
                - None:
                    ``strict`` argument will not be passed to the model.

            tools:
                A list of tool-like objects to bind to the chat model. Requires that:

                - ``method`` is ``"json_schema"`` (default).
                - ``strict=True``
                - ``include_raw=True``

                If a model elects to call a
                tool, the resulting ``AIMessage`` in ``"raw"`` will include tool calls.

                .. dropdown:: Example

                    .. code-block:: python

                        from langchain.chat_models import init_chat_model
                        from pydantic import BaseModel


                        class ResponseSchema(BaseModel):
                            response: str


                        def get_weather(location: str) -> str:
                            \"\"\"Get weather at a location.\"\"\"
                            pass

                        llm = init_chat_model("openai:gpt-4o-mini")

                        structured_llm = llm.with_structured_output(
                            ResponseSchema,
                            tools=[get_weather],
                            strict=True,
                            include_raw=True,
                        )

                        structured_llm.invoke("What's the weather in Boston?")

                    .. code-block:: python

                        {
                            "raw": AIMessage(content="", tool_calls=[...], ...),
                            "parsing_error": None,
                            "parsed": None,
                        }

            kwargs: Additional keyword args aren't supported.

        Returns:
            A Runnable that takes same inputs as a :class:`langchain_core.language_models.chat.BaseChatModel`.

            | If ``include_raw`` is False and ``schema`` is a Pydantic class, Runnable outputs an instance of ``schema`` (i.e., a Pydantic object). Otherwise, if ``include_raw`` is False then Runnable outputs a dict.

            | If ``include_raw`` is True, then Runnable outputs a dict with keys:

            - "raw": BaseMessage
            - "parsed": None if there was a parsing error, otherwise the type depends on the ``schema`` as described above.
            - "parsing_error": Optional[BaseException]

        .. versionchanged:: 0.1.20

            Added support for TypedDict class ``schema``.

        .. versionchanged:: 0.1.21

            Support for ``strict`` argument added.
            Support for ``method`` = "json_schema" added.

        .. versionchanged:: 0.3.12
            Support for ``tools`` added.
        """  # noqa: E501
        if kwargs:
            raise ValueError(f"Received unsupported arguments {kwargs}")
        if strict is not None and method == "json_mode":
            raise ValueError(
                "Argument `strict` is not supported with `method`='json_mode'"
            )
        is_pydantic_schema = _is_pydantic_class(schema)

        if method == "json_schema":
            # Check for Pydantic BaseModel V1
            if (
                is_pydantic_schema and issubclass(schema, BaseModelV1)  # type: ignore[arg-type]
            ):
                warnings.warn(
                    "Received a Pydantic BaseModel V1 schema. This is not supported by "
                    'method="json_schema". Please use method="function_calling" '
                    "or specify schema via JSON Schema or Pydantic V2 BaseModel. "
                    'Overriding to method="function_calling".'
                )
                method = "function_calling"
            # Check for incompatible model
            if self.model_name and (
                self.model_name.startswith("gpt-3")
                or self.model_name.startswith("gpt-4-")
                or self.model_name == "gpt-4"
            ):
                warnings.warn(
                    f"Cannot use method='json_schema' with model {self.model_name} "
                    f"since it doesn't support OpenAI's Structured Output API. You can "
                    f"see supported models here: "
                    f"https://platform.openai.com/docs/guides/structured-outputs#supported-models. "  # noqa: E501
                    "To fix this warning, set `method='function_calling'. "
                    "Overriding to method='function_calling'."
                )
                method = "function_calling"

        if method == "function_calling":
            if schema is None:
                raise ValueError(
                    "schema must be specified when method is not 'json_mode'. "
                    "Received None."
                )
            tool_name = convert_to_openai_tool(schema)["function"]["name"]
            bind_kwargs = self._filter_disabled_params(
                tool_choice=tool_name,
                parallel_tool_calls=False,
                strict=strict,
                ls_structured_output_format={
                    "kwargs": {"method": method, "strict": strict},
                    "schema": schema,
                },
            )

            llm = self.bind_tools([schema], **bind_kwargs)
            if is_pydantic_schema:
                output_parser: Runnable = PydanticToolsParser(
                    tools=[schema],  # type: ignore[list-item]
                    first_tool_only=True,  # type: ignore[list-item]
                )
            else:
                output_parser = JsonOutputKeyToolsParser(
                    key_name=tool_name, first_tool_only=True
                )
        elif method == "json_mode":
            llm = self.bind(
                response_format={"type": "json_object"},
                ls_structured_output_format={
                    "kwargs": {"method": method},
                    "schema": schema,
                },
            )
            output_parser = (
                PydanticOutputParser(pydantic_object=schema)  # type: ignore[arg-type]
                if is_pydantic_schema
                else JsonOutputParser()
            )
        elif method == "json_schema":
            if schema is None:
                raise ValueError(
                    "schema must be specified when method is not 'json_mode'. "
                    "Received None."
                )
            response_format = _convert_to_openai_response_format(schema, strict=strict)
            bind_kwargs = dict(
                response_format=response_format,
                ls_structured_output_format={
                    "kwargs": {"method": method, "strict": strict},
                    "schema": convert_to_openai_tool(schema),
                },
            )
            if tools:
                bind_kwargs["tools"] = [
                    convert_to_openai_tool(t, strict=strict) for t in tools
                ]
            llm = self.bind(**bind_kwargs)
            if is_pydantic_schema:
                output_parser = RunnableLambda(
                    partial(_oai_structured_outputs_parser, schema=cast(type, schema))
                ).with_types(output_type=cast(type, schema))
            else:
                output_parser = JsonOutputParser()
        else:
            raise ValueError(
                f"Unrecognized method argument. Expected one of 'function_calling' or "
                f"'json_mode'. Received: '{method}'"
            )

        if include_raw:
            parser_assign = RunnablePassthrough.assign(
                parsed=itemgetter("raw") | output_parser, parsing_error=lambda _: None
            )
            parser_none = RunnablePassthrough.assign(parsed=lambda _: None)
            parser_with_fallback = parser_assign.with_fallbacks(
                [parser_none], exception_key="parsing_error"
            )
            return RunnableMap(raw=llm) | parser_with_fallback
        else:
            return llm | output_parser

    def _filter_disabled_params(self, **kwargs: Any) -> dict[str, Any]:
        if not self.disabled_params:
            return kwargs
        filtered = {}
        for k, v in kwargs.items():
            # Skip param
            if k in self.disabled_params and (
                self.disabled_params[k] is None or v in self.disabled_params[k]
            ):
                continue
            # Keep param
            else:
                filtered[k] = v
        return filtered

    def _get_generation_chunk_from_completion(
        self, completion: openai.BaseModel
    ) -> ChatGenerationChunk:
        """Get chunk from completion (e.g., from final completion of a stream)."""
        chat_result = self._create_chat_result(completion)
        chat_message = chat_result.generations[0].message
        if isinstance(chat_message, AIMessage):
            usage_metadata = chat_message.usage_metadata
            # Skip tool_calls, already sent as chunks
            if "tool_calls" in chat_message.additional_kwargs:
                chat_message.additional_kwargs.pop("tool_calls")
        else:
            usage_metadata = None
        message = AIMessageChunk(
            content="",
            additional_kwargs=chat_message.additional_kwargs,
            usage_metadata=usage_metadata,
        )
        return ChatGenerationChunk(
            message=message, generation_info=chat_result.llm_output
        )


class ChatOpenAI(BaseChatOpenAI):  # type: ignore[override]
    """OpenAI chat model integration.

    .. dropdown:: Setup
        :open:

        Install ``langchain-openai`` and set environment variable ``OPENAI_API_KEY``.

        .. code-block:: bash

            pip install -U langchain-openai
            export OPENAI_API_KEY="your-api-key"

    .. dropdown:: Key init args — completion params

        model: str
            Name of OpenAI model to use.
        temperature: float
            Sampling temperature.
        max_tokens: Optional[int]
            Max number of tokens to generate.
        logprobs: Optional[bool]
            Whether to return logprobs.
        stream_options: Dict
            Configure streaming outputs, like whether to return token usage when
            streaming (``{"include_usage": True}``).
        use_responses_api: Optional[bool]
            Whether to use the responses API.

        See full list of supported init args and their descriptions in the params section.

    .. dropdown:: Key init args — client params

        timeout: Union[float, Tuple[float, float], Any, None]
            Timeout for requests.
        max_retries: Optional[int]
            Max number of retries.
        api_key: Optional[str]
            OpenAI API key. If not passed in will be read from env var OPENAI_API_KEY.
        base_url: Optional[str]
            Base URL for API requests. Only specify if using a proxy or service
            emulator.
        organization: Optional[str]
            OpenAI organization ID. If not passed in will be read from env
            var OPENAI_ORG_ID.

        See full list of supported init args and their descriptions in the params section.

    .. dropdown:: Instantiate

        .. code-block:: python

            from langchain_openai import ChatOpenAI

            llm = ChatOpenAI(
                model="gpt-4o",
                temperature=0,
                max_tokens=None,
                timeout=None,
                max_retries=2,
                # api_key="...",
                # base_url="...",
                # organization="...",
                # other params...
            )

        **NOTE**: Any param which is not explicitly supported will be passed directly to the
        ``openai.OpenAI.chat.completions.create(...)`` API every time to the model is
        invoked. For example:

        .. code-block:: python

            from langchain_openai import ChatOpenAI
            import openai

            ChatOpenAI(..., frequency_penalty=0.2).invoke(...)

            # results in underlying API call of:

            openai.OpenAI(..).chat.completions.create(..., frequency_penalty=0.2)

            # which is also equivalent to:

            ChatOpenAI(...).invoke(..., frequency_penalty=0.2)

    .. dropdown:: Invoke

        .. code-block:: python

            messages = [
                (
                    "system",
                    "You are a helpful translator. Translate the user sentence to French.",
                ),
                ("human", "I love programming."),
            ]
            llm.invoke(messages)

        .. code-block:: pycon

            AIMessage(
                content="J'adore la programmation.",
                response_metadata={
                    "token_usage": {
                        "completion_tokens": 5,
                        "prompt_tokens": 31,
                        "total_tokens": 36,
                    },
                    "model_name": "gpt-4o",
                    "system_fingerprint": "fp_43dfabdef1",
                    "finish_reason": "stop",
                    "logprobs": None,
                },
                id="run-012cffe2-5d3d-424d-83b5-51c6d4a593d1-0",
                usage_metadata={"input_tokens": 31, "output_tokens": 5, "total_tokens": 36},
            )

    .. dropdown:: Stream

        .. code-block:: python

            for chunk in llm.stream(messages):
                print(chunk.text(), end="")

        .. code-block:: python

            AIMessageChunk(content="", id="run-9e1517e3-12bf-48f2-bb1b-2e824f7cd7b0")
            AIMessageChunk(content="J", id="run-9e1517e3-12bf-48f2-bb1b-2e824f7cd7b0")
            AIMessageChunk(content="'adore", id="run-9e1517e3-12bf-48f2-bb1b-2e824f7cd7b0")
            AIMessageChunk(content=" la", id="run-9e1517e3-12bf-48f2-bb1b-2e824f7cd7b0")
            AIMessageChunk(
                content=" programmation", id="run-9e1517e3-12bf-48f2-bb1b-2e824f7cd7b0"
            )
            AIMessageChunk(content=".", id="run-9e1517e3-12bf-48f2-bb1b-2e824f7cd7b0")
            AIMessageChunk(
                content="",
                response_metadata={"finish_reason": "stop"},
                id="run-9e1517e3-12bf-48f2-bb1b-2e824f7cd7b0",
            )

        .. code-block:: python

            stream = llm.stream(messages)
            full = next(stream)
            for chunk in stream:
                full += chunk
            full

        .. code-block:: python

            AIMessageChunk(
                content="J'adore la programmation.",
                response_metadata={"finish_reason": "stop"},
                id="run-bf917526-7f58-4683-84f7-36a6b671d140",
            )

    .. dropdown:: Async

        .. code-block:: python

            await llm.ainvoke(messages)

            # stream:
            # async for chunk in (await llm.astream(messages))

            # batch:
            # await llm.abatch([messages])

        .. code-block:: python

            AIMessage(
                content="J'adore la programmation.",
                response_metadata={
                    "token_usage": {
                        "completion_tokens": 5,
                        "prompt_tokens": 31,
                        "total_tokens": 36,
                    },
                    "model_name": "gpt-4o",
                    "system_fingerprint": "fp_43dfabdef1",
                    "finish_reason": "stop",
                    "logprobs": None,
                },
                id="run-012cffe2-5d3d-424d-83b5-51c6d4a593d1-0",
                usage_metadata={"input_tokens": 31, "output_tokens": 5, "total_tokens": 36},
            )

    .. dropdown:: Tool calling

        .. code-block:: python

            from pydantic import BaseModel, Field


            class GetWeather(BaseModel):
                '''Get the current weather in a given location'''

                location: str = Field(
                    ..., description="The city and state, e.g. San Francisco, CA"
                )


            class GetPopulation(BaseModel):
                '''Get the current population in a given location'''

                location: str = Field(
                    ..., description="The city and state, e.g. San Francisco, CA"
                )


            llm_with_tools = llm.bind_tools(
                [GetWeather, GetPopulation]
                # strict = True  # enforce tool args schema is respected
            )
            ai_msg = llm_with_tools.invoke(
                "Which city is hotter today and which is bigger: LA or NY?"
            )
            ai_msg.tool_calls

        .. code-block:: python

            [
                {
                    "name": "GetWeather",
                    "args": {"location": "Los Angeles, CA"},
                    "id": "call_6XswGD5Pqk8Tt5atYr7tfenU",
                },
                {
                    "name": "GetWeather",
                    "args": {"location": "New York, NY"},
                    "id": "call_ZVL15vA8Y7kXqOy3dtmQgeCi",
                },
                {
                    "name": "GetPopulation",
                    "args": {"location": "Los Angeles, CA"},
                    "id": "call_49CFW8zqC9W7mh7hbMLSIrXw",
                },
                {
                    "name": "GetPopulation",
                    "args": {"location": "New York, NY"},
                    "id": "call_6ghfKxV264jEfe1mRIkS3PE7",
                },
            ]

        Note that ``openai >= 1.32`` supports a ``parallel_tool_calls`` parameter
        that defaults to ``True``. This parameter can be set to ``False`` to
        disable parallel tool calls:

        .. code-block:: python

            ai_msg = llm_with_tools.invoke(
                "What is the weather in LA and NY?", parallel_tool_calls=False
            )
            ai_msg.tool_calls

        .. code-block:: python

            [
                {
                    "name": "GetWeather",
                    "args": {"location": "Los Angeles, CA"},
                    "id": "call_4OoY0ZR99iEvC7fevsH8Uhtz",
                }
            ]

        Like other runtime parameters, ``parallel_tool_calls`` can be bound to a model
        using ``llm.bind(parallel_tool_calls=False)`` or during instantiation by
        setting ``model_kwargs``.

        See ``ChatOpenAI.bind_tools()`` method for more.

    .. dropdown:: Built-in tools

        .. versionadded:: 0.3.9

        You can access `built-in tools <https://platform.openai.com/docs/guides/tools?api-mode=responses>`_
        supported by the OpenAI Responses API. See LangChain
        `docs <https://python.langchain.com/docs/integrations/chat/openai/>`_ for more
        detail.

        .. code-block:: python

            from langchain_openai import ChatOpenAI

            llm = ChatOpenAI(model="gpt-4o-mini")

            tool = {"type": "web_search_preview"}
            llm_with_tools = llm.bind_tools([tool])

            response = llm_with_tools.invoke("What was a positive news story from today?")
            response.content

        .. code-block:: python

            [
                {
                    "type": "text",
                    "text": "Today, a heartwarming story emerged from ...",
                    "annotations": [
                        {
                            "end_index": 778,
                            "start_index": 682,
                            "title": "Title of story",
                            "type": "url_citation",
                            "url": "<url of story>",
                        }
                    ],
                }
            ]

    .. dropdown:: Managing conversation state

        .. versionadded:: 0.3.9

        OpenAI's Responses API supports management of
        `conversation state <https://platform.openai.com/docs/guides/conversation-state?api-mode=responses>`_.
        Passing in response IDs from previous messages will continue a conversational
        thread. See LangChain
        `docs <https://python.langchain.com/docs/integrations/chat/openai/>`_ for more
        detail.

        .. code-block:: python

            from langchain_openai import ChatOpenAI

            llm = ChatOpenAI(model="gpt-4o-mini", use_responses_api=True)
            response = llm.invoke("Hi, I'm Bob.")
            response.text()

        .. code-block:: python

            "Hi Bob! How can I assist you today?"

        .. code-block:: python

            second_response = llm.invoke(
                "What is my name?", previous_response_id=response.response_metadata["id"]
            )
            second_response.text()

        .. code-block:: python

            "Your name is Bob. How can I help you today, Bob?"

    .. dropdown:: Reasoning output

        OpenAI's Responses API supports `reasoning models <https://platform.openai.com/docs/guides/reasoning?api-mode=responses>`_
        that expose a summary of internal reasoning processes.

        .. code-block:: python

            from langchain_openai import ChatOpenAI

            reasoning = {
                "effort": "medium",  # 'low', 'medium', or 'high'
                "summary": "auto",  # 'detailed', 'auto', or None
            }

            llm = ChatOpenAI(
                model="o4-mini", use_responses_api=True, model_kwargs={"reasoning": reasoning}
            )
            response = llm.invoke("What is 3^3?")

            print(f"Output: {response.text()}")
            print(f"Reasoning: {response.additional_kwargs['reasoning']}")

        .. code-block:: none

            Output: 3^3 = 27.

            Reasoning: {
                'id': 'rs_67fffc44b1c08191b6ca9bead6d832590433145b1786f809',
                'summary': [
                    {'text': 'The user wants to know...', 'type': 'summary_text'}
                ],
                'type': 'reasoning'
            }

    .. dropdown:: Structured output

        .. code-block:: python

            from typing import Optional

            from pydantic import BaseModel, Field


            class Joke(BaseModel):
                '''Joke to tell user.'''

                setup: str = Field(description="The setup of the joke")
                punchline: str = Field(description="The punchline to the joke")
                rating: Optional[int] = Field(description="How funny the joke is, from 1 to 10")


            structured_llm = llm.with_structured_output(Joke)
            structured_llm.invoke("Tell me a joke about cats")

        .. code-block:: python

            Joke(
                setup="Why was the cat sitting on the computer?",
                punchline="To keep an eye on the mouse!",
                rating=None,
            )

        See ``ChatOpenAI.with_structured_output()`` for more.

    .. dropdown:: JSON mode

        .. code-block:: python

            json_llm = llm.bind(response_format={"type": "json_object"})
            ai_msg = json_llm.invoke(
                "Return a JSON object with key 'random_ints' and a value of 10 random ints in [0-99]"
            )
            ai_msg.content

        .. code-block:: python

            '\\n{\\n  "random_ints": [23, 87, 45, 12, 78, 34, 56, 90, 11, 67]\\n}'

    .. dropdown:: Image input

        .. code-block:: python

            import base64
            import httpx
            from langchain_core.messages import HumanMessage

            image_url = "https://upload.wikimedia.org/wikipedia/commons/thumb/d/dd/Gfp-wisconsin-madison-the-nature-boardwalk.jpg/2560px-Gfp-wisconsin-madison-the-nature-boardwalk.jpg"
            image_data = base64.b64encode(httpx.get(image_url).content).decode("utf-8")
            message = HumanMessage(
                content=[
                    {"type": "text", "text": "describe the weather in this image"},
                    {
                        "type": "image_url",
                        "image_url": {"url": f"data:image/jpeg;base64,{image_data}"},
                    },
                ]
            )
            ai_msg = llm.invoke([message])
            ai_msg.content

        .. code-block:: python

            "The weather in the image appears to be clear and pleasant. The sky is mostly blue with scattered, light clouds, suggesting a sunny day with minimal cloud cover. There is no indication of rain or strong winds, and the overall scene looks bright and calm. The lush green grass and clear visibility further indicate good weather conditions."

    .. dropdown:: Token usage

        .. code-block:: python

            ai_msg = llm.invoke(messages)
            ai_msg.usage_metadata

        .. code-block:: python

            {"input_tokens": 28, "output_tokens": 5, "total_tokens": 33}

        When streaming, set the ``stream_usage`` kwarg:

        .. code-block:: python

            stream = llm.stream(messages, stream_usage=True)
            full = next(stream)
            for chunk in stream:
                full += chunk
            full.usage_metadata

        .. code-block:: python

            {"input_tokens": 28, "output_tokens": 5, "total_tokens": 33}

        Alternatively, setting ``stream_usage`` when instantiating the model can be
        useful when incorporating ``ChatOpenAI`` into LCEL chains-- or when using
        methods like ``.with_structured_output``, which generate chains under the
        hood.

        .. code-block:: python

            llm = ChatOpenAI(model="gpt-4o", stream_usage=True)
            structured_llm = llm.with_structured_output(...)

    .. dropdown:: Logprobs

        .. code-block:: python

            logprobs_llm = llm.bind(logprobs=True)
            ai_msg = logprobs_llm.invoke(messages)
            ai_msg.response_metadata["logprobs"]

        .. code-block:: python

            {
                "content": [
                    {
                        "token": "J",
                        "bytes": [74],
                        "logprob": -4.9617593e-06,
                        "top_logprobs": [],
                    },
                    {
                        "token": "'adore",
                        "bytes": [39, 97, 100, 111, 114, 101],
                        "logprob": -0.25202933,
                        "top_logprobs": [],
                    },
                    {
                        "token": " la",
                        "bytes": [32, 108, 97],
                        "logprob": -0.20141791,
                        "top_logprobs": [],
                    },
                    {
                        "token": " programmation",
                        "bytes": [
                            32,
                            112,
                            114,
                            111,
                            103,
                            114,
                            97,
                            109,
                            109,
                            97,
                            116,
                            105,
                            111,
                            110,
                        ],
                        "logprob": -1.9361265e-07,
                        "top_logprobs": [],
                    },
                    {
                        "token": ".",
                        "bytes": [46],
                        "logprob": -1.2233183e-05,
                        "top_logprobs": [],
                    },
                ]
            }

    .. dropdown:: Response metadata

        .. code-block:: python

            ai_msg = llm.invoke(messages)
            ai_msg.response_metadata

        .. code-block:: python

            {
                "token_usage": {
                    "completion_tokens": 5,
                    "prompt_tokens": 28,
                    "total_tokens": 33,
                },
                "model_name": "gpt-4o",
                "system_fingerprint": "fp_319be4768e",
                "finish_reason": "stop",
                "logprobs": None,
            }

    .. dropdown:: Flex processing

        OpenAI offers a variety of
        `service tiers <https://platform.openai.com/docs/guides/flex-processing>`_.
        The "flex" tier offers cheaper pricing for requests, with the trade-off that
        responses may take longer and resources might not always be available.
        This approach is best suited for non-critical tasks, including model testing,
        data enhancement, or jobs that can be run asynchronously.

        To use it, initialize the model with ``service_tier="flex"``:

        .. code-block:: python

            from langchain_openai import ChatOpenAI

            llm = ChatOpenAI(model="o4-mini", service_tier="flex")

        Note that this is a beta feature that is only available for a subset of models.
        See OpenAI `docs <https://platform.openai.com/docs/guides/flex-processing>`_
        for more detail.

    """  # noqa: E501

    max_tokens: Optional[int] = Field(default=None, alias="max_completion_tokens")
    """Maximum number of tokens to generate."""

    @property
    def lc_secrets(self) -> dict[str, str]:
        return {"openai_api_key": "OPENAI_API_KEY"}

    @classmethod
    def get_lc_namespace(cls) -> list[str]:
        """Get the namespace of the langchain object."""
        return ["langchain", "chat_models", "openai"]

    @property
    def lc_attributes(self) -> dict[str, Any]:
        attributes: dict[str, Any] = {}

        if self.openai_organization:
            attributes["openai_organization"] = self.openai_organization

        if self.openai_api_base:
            attributes["openai_api_base"] = self.openai_api_base

        if self.openai_proxy:
            attributes["openai_proxy"] = self.openai_proxy

        return attributes

    @classmethod
    def is_lc_serializable(cls) -> bool:
        """Return whether this model can be serialized by Langchain."""
        return True

    @property
    def _default_params(self) -> dict[str, Any]:
        """Get the default parameters for calling OpenAI API."""
        params = super()._default_params
        if "max_tokens" in params:
            params["max_completion_tokens"] = params.pop("max_tokens")

        return params

    def _get_request_payload(
        self,
        input_: LanguageModelInput,
        *,
        stop: Optional[list[str]] = None,
        **kwargs: Any,
    ) -> dict:
        payload = super()._get_request_payload(input_, stop=stop, **kwargs)
        # max_tokens was deprecated in favor of max_completion_tokens
        # in September 2024 release
        if "max_tokens" in payload:
            payload["max_completion_tokens"] = payload.pop("max_tokens")

        # Mutate system message role to "developer" for o-series models
        if self.model_name and re.match(r"^o\d", self.model_name):
            for message in payload.get("messages", []):
                if message["role"] == "system":
                    message["role"] = "developer"
        return payload

    def _stream(self, *args: Any, **kwargs: Any) -> Iterator[ChatGenerationChunk]:
        """Route to Chat Completions or Responses API."""
        if self._use_responses_api({**kwargs, **self.model_kwargs}):
            return super()._stream_responses(*args, **kwargs)
        else:
            return super()._stream(*args, **kwargs)

    async def _astream(
        self, *args: Any, **kwargs: Any
    ) -> AsyncIterator[ChatGenerationChunk]:
        """Route to Chat Completions or Responses API."""
        if self._use_responses_api({**kwargs, **self.model_kwargs}):
            async for chunk in super()._astream_responses(*args, **kwargs):
                yield chunk
        else:
            async for chunk in super()._astream(*args, **kwargs):
                yield chunk

    def with_structured_output(
        self,
        schema: Optional[_DictOrPydanticClass] = None,
        *,
        method: Literal["function_calling", "json_mode", "json_schema"] = "json_schema",
        include_raw: bool = False,
        strict: Optional[bool] = None,
        **kwargs: Any,
    ) -> Runnable[LanguageModelInput, _DictOrPydantic]:
        """Model wrapper that returns outputs formatted to match the given schema.

        Args:
            schema:
                The output schema. Can be passed in as:

                - a JSON Schema,
                - a TypedDict class,
                - or a Pydantic class,
                - an OpenAI function/tool schema.

                If ``schema`` is a Pydantic class then the model output will be a
                Pydantic instance of that class, and the model-generated fields will be
                validated by the Pydantic class. Otherwise the model output will be a
                dict and will not be validated. See :meth:`langchain_core.utils.function_calling.convert_to_openai_tool`
                for more on how to properly specify types and descriptions of
                schema fields when specifying a Pydantic or TypedDict class.

            method: The method for steering model generation, one of:

                - "json_schema":
                    Uses OpenAI's Structured Output API:
                    https://platform.openai.com/docs/guides/structured-outputs
                    Supported for "gpt-4o-mini", "gpt-4o-2024-08-06", "o1", and later
                    models.
                - "function_calling":
                    Uses OpenAI's tool-calling (formerly called function calling)
                    API: https://platform.openai.com/docs/guides/function-calling
                - "json_mode":
                    Uses OpenAI's JSON mode. Note that if using JSON mode then you
                    must include instructions for formatting the output into the
                    desired schema into the model call:
                    https://platform.openai.com/docs/guides/structured-outputs/json-mode

                Learn more about the differences between the methods and which models
                support which methods here:

                - https://platform.openai.com/docs/guides/structured-outputs/structured-outputs-vs-json-mode
                - https://platform.openai.com/docs/guides/structured-outputs/function-calling-vs-response-format

            include_raw:
                If False then only the parsed structured output is returned. If
                an error occurs during model output parsing it will be raised. If True
                then both the raw model response (a BaseMessage) and the parsed model
                response will be returned. If an error occurs during output parsing it
                will be caught and returned as well. The final output is always a dict
                with keys "raw", "parsed", and "parsing_error".
            strict:

                - True:
                    Model output is guaranteed to exactly match the schema.
                    The input schema will also be validated according to
                    https://platform.openai.com/docs/guides/structured-outputs/supported-schemas
                - False:
                    Input schema will not be validated and model output will not be
                    validated.
                - None:
                    ``strict`` argument will not be passed to the model.

                If schema is specified via TypedDict or JSON schema, ``strict`` is not
                enabled by default. Pass ``strict=True`` to enable it.

                Note: ``strict`` can only be non-null if ``method`` is
                ``"json_schema"`` or ``"function_calling"``.

            kwargs: Additional keyword args aren't supported.

        Returns:
            A Runnable that takes same inputs as a :class:`langchain_core.language_models.chat.BaseChatModel`.

            | If ``include_raw`` is False and ``schema`` is a Pydantic class, Runnable outputs an instance of ``schema`` (i.e., a Pydantic object). Otherwise, if ``include_raw`` is False then Runnable outputs a dict.

            | If ``include_raw`` is True, then Runnable outputs a dict with keys:

            - "raw": BaseMessage
            - "parsed": None if there was a parsing error, otherwise the type depends on the ``schema`` as described above.
            - "parsing_error": Optional[BaseException]

        .. versionchanged:: 0.1.20

            Added support for TypedDict class ``schema``.

        .. versionchanged:: 0.1.21

            Support for ``strict`` argument added.
            Support for ``method="json_schema"`` added.

        .. versionchanged:: 0.3.0

            ``method`` default changed from "function_calling" to "json_schema".

        .. dropdown:: Example: schema=Pydantic class, method="json_schema", include_raw=False, strict=True

            Note, OpenAI has a number of restrictions on what types of schemas can be
            provided if ``strict`` = True. When using Pydantic, our model cannot
            specify any Field metadata (like min/max constraints) and fields cannot
            have default values.

            See all constraints here: https://platform.openai.com/docs/guides/structured-outputs/supported-schemas

            .. code-block:: python

                from typing import Optional

                from langchain_openai import ChatOpenAI
                from pydantic import BaseModel, Field


                class AnswerWithJustification(BaseModel):
                    '''An answer to the user question along with justification for the answer.'''

                    answer: str
                    justification: Optional[str] = Field(
                        default=..., description="A justification for the answer."
                    )


                llm = ChatOpenAI(model="gpt-4o", temperature=0)
                structured_llm = llm.with_structured_output(AnswerWithJustification)

                structured_llm.invoke(
                    "What weighs more a pound of bricks or a pound of feathers"
                )

                # -> AnswerWithJustification(
                #     answer='They weigh the same',
                #     justification='Both a pound of bricks and a pound of feathers weigh one pound. The weight is the same, but the volume or density of the objects may differ.'
                # )

        .. dropdown:: Example: schema=Pydantic class, method="function_calling", include_raw=False, strict=False

            .. code-block:: python

                from typing import Optional

                from langchain_openai import ChatOpenAI
                from pydantic import BaseModel, Field


                class AnswerWithJustification(BaseModel):
                    '''An answer to the user question along with justification for the answer.'''

                    answer: str
                    justification: Optional[str] = Field(
                        default=..., description="A justification for the answer."
                    )


                llm = ChatOpenAI(model="gpt-4o", temperature=0)
                structured_llm = llm.with_structured_output(
                    AnswerWithJustification, method="function_calling"
                )

                structured_llm.invoke(
                    "What weighs more a pound of bricks or a pound of feathers"
                )

                # -> AnswerWithJustification(
                #     answer='They weigh the same',
                #     justification='Both a pound of bricks and a pound of feathers weigh one pound. The weight is the same, but the volume or density of the objects may differ.'
                # )

        .. dropdown:: Example: schema=Pydantic class, method="json_schema", include_raw=True

            .. code-block:: python

                from langchain_openai import ChatOpenAI
                from pydantic import BaseModel


                class AnswerWithJustification(BaseModel):
                    '''An answer to the user question along with justification for the answer.'''

                    answer: str
                    justification: str


                llm = ChatOpenAI(model="gpt-4o", temperature=0)
                structured_llm = llm.with_structured_output(
                    AnswerWithJustification, include_raw=True
                )

                structured_llm.invoke(
                    "What weighs more a pound of bricks or a pound of feathers"
                )
                # -> {
                #     'raw': AIMessage(content='', additional_kwargs={'tool_calls': [{'id': 'call_Ao02pnFYXD6GN1yzc0uXPsvF', 'function': {'arguments': '{"answer":"They weigh the same.","justification":"Both a pound of bricks and a pound of feathers weigh one pound. The weight is the same, but the volume or density of the objects may differ."}', 'name': 'AnswerWithJustification'}, 'type': 'function'}]}),
                #     'parsed': AnswerWithJustification(answer='They weigh the same.', justification='Both a pound of bricks and a pound of feathers weigh one pound. The weight is the same, but the volume or density of the objects may differ.'),
                #     'parsing_error': None
                # }

        .. dropdown:: Example: schema=TypedDict class, method="json_schema", include_raw=False, strict=False

            .. code-block:: python

                # IMPORTANT: If you are using Python <=3.8, you need to import Annotated
                # from typing_extensions, not from typing.
                from typing_extensions import Annotated, TypedDict

                from langchain_openai import ChatOpenAI


                class AnswerWithJustification(TypedDict):
                    '''An answer to the user question along with justification for the answer.'''

                    answer: str
                    justification: Annotated[
                        Optional[str], None, "A justification for the answer."
                    ]


                llm = ChatOpenAI(model="gpt-4o", temperature=0)
                structured_llm = llm.with_structured_output(AnswerWithJustification)

                structured_llm.invoke(
                    "What weighs more a pound of bricks or a pound of feathers"
                )
                # -> {
                #     'answer': 'They weigh the same',
                #     'justification': 'Both a pound of bricks and a pound of feathers weigh one pound. The weight is the same, but the volume and density of the two substances differ.'
                # }

        .. dropdown:: Example: schema=OpenAI function schema, method="json_schema", include_raw=False

            .. code-block:: python

                from langchain_openai import ChatOpenAI

                oai_schema = {
                    'name': 'AnswerWithJustification',
                    'description': 'An answer to the user question along with justification for the answer.',
                    'parameters': {
                        'type': 'object',
                        'properties': {
                            'answer': {'type': 'string'},
                            'justification': {'description': 'A justification for the answer.', 'type': 'string'}
                        },
                       'required': ['answer']
                   }
               }

                llm = ChatOpenAI(model="gpt-4o", temperature=0)
                structured_llm = llm.with_structured_output(oai_schema)

                structured_llm.invoke(
                    "What weighs more a pound of bricks or a pound of feathers"
                )
                # -> {
                #     'answer': 'They weigh the same',
                #     'justification': 'Both a pound of bricks and a pound of feathers weigh one pound. The weight is the same, but the volume and density of the two substances differ.'
                # }

        .. dropdown:: Example: schema=Pydantic class, method="json_mode", include_raw=True

            .. code-block::

                from langchain_openai import ChatOpenAI
                from pydantic import BaseModel

                class AnswerWithJustification(BaseModel):
                    answer: str
                    justification: str

                llm = ChatOpenAI(model="gpt-4o", temperature=0)
                structured_llm = llm.with_structured_output(
                    AnswerWithJustification,
                    method="json_mode",
                    include_raw=True
                )

                structured_llm.invoke(
                    "Answer the following question. "
                    "Make sure to return a JSON blob with keys 'answer' and 'justification'.\\n\\n"
                    "What's heavier a pound of bricks or a pound of feathers?"
                )
                # -> {
                #     'raw': AIMessage(content='{\\n    "answer": "They are both the same weight.",\\n    "justification": "Both a pound of bricks and a pound of feathers weigh one pound. The difference lies in the volume and density of the materials, not the weight." \\n}'),
                #     'parsed': AnswerWithJustification(answer='They are both the same weight.', justification='Both a pound of bricks and a pound of feathers weigh one pound. The difference lies in the volume and density of the materials, not the weight.'),
                #     'parsing_error': None
                # }

        .. dropdown:: Example: schema=None, method="json_mode", include_raw=True

            .. code-block::

                structured_llm = llm.with_structured_output(method="json_mode", include_raw=True)

                structured_llm.invoke(
                    "Answer the following question. "
                    "Make sure to return a JSON blob with keys 'answer' and 'justification'.\\n\\n"
                    "What's heavier a pound of bricks or a pound of feathers?"
                )
                # -> {
                #     'raw': AIMessage(content='{\\n    "answer": "They are both the same weight.",\\n    "justification": "Both a pound of bricks and a pound of feathers weigh one pound. The difference lies in the volume and density of the materials, not the weight." \\n}'),
                #     'parsed': {
                #         'answer': 'They are both the same weight.',
                #         'justification': 'Both a pound of bricks and a pound of feathers weigh one pound. The difference lies in the volume and density of the materials, not the weight.'
                #     },
                #     'parsing_error': None
                # }
        """  # noqa: E501
        return super().with_structured_output(
            schema, method=method, include_raw=include_raw, strict=strict, **kwargs
        )


def _is_pydantic_class(obj: Any) -> bool:
    return isinstance(obj, type) and is_basemodel_subclass(obj)


def _lc_tool_call_to_openai_tool_call(tool_call: ToolCall) -> dict:
    return {
        "type": "function",
        "id": tool_call["id"],
        "function": {
            "name": tool_call["name"],
            "arguments": json.dumps(tool_call["args"]),
        },
    }


def _lc_invalid_tool_call_to_openai_tool_call(
    invalid_tool_call: InvalidToolCall,
) -> dict:
    return {
        "type": "function",
        "id": invalid_tool_call["id"],
        "function": {
            "name": invalid_tool_call["name"],
            "arguments": invalid_tool_call["args"],
        },
    }


def _url_to_size(image_source: str) -> Optional[tuple[int, int]]:
    try:
        from PIL import Image  # type: ignore[import]
    except ImportError:
        logger.info(
            "Unable to count image tokens. To count image tokens please install "
            "`pip install -U pillow httpx`."
        )
        return None
    if _is_url(image_source):
        try:
            import httpx
        except ImportError:
            logger.info(
                "Unable to count image tokens. To count image tokens please install "
                "`pip install -U httpx`."
            )
            return None
        response = httpx.get(image_source)
        response.raise_for_status()
        width, height = Image.open(BytesIO(response.content)).size
        return width, height
    elif _is_b64(image_source):
        _, encoded = image_source.split(",", 1)
        data = base64.b64decode(encoded)
        width, height = Image.open(BytesIO(data)).size
        return width, height
    else:
        return None


def _count_image_tokens(width: int, height: int) -> int:
    # Reference: https://platform.openai.com/docs/guides/vision/calculating-costs
    width, height = _resize(width, height)
    h = ceil(height / 512)
    w = ceil(width / 512)
    return (170 * h * w) + 85


def _is_url(s: str) -> bool:
    try:
        result = urlparse(s)
        return all([result.scheme, result.netloc])
    except Exception as e:
        logger.debug(f"Unable to parse URL: {e}")
        return False


def _is_b64(s: str) -> bool:
    return s.startswith("data:image")


def _resize(width: int, height: int) -> tuple[int, int]:
    # larger side must be <= 2048
    if width > 2048 or height > 2048:
        if width > height:
            height = (height * 2048) // width
            width = 2048
        else:
            width = (width * 2048) // height
            height = 2048
    # smaller side must be <= 768
    if width > 768 and height > 768:
        if width > height:
            width = (width * 768) // height
            height = 768
        else:
            height = (width * 768) // height
            width = 768
    return width, height


def _convert_to_openai_response_format(
    schema: Union[dict[str, Any], type], *, strict: Optional[bool] = None
) -> Union[dict, TypeBaseModel]:
    if isinstance(schema, type) and is_basemodel_subclass(schema):
        return schema

    if (
        isinstance(schema, dict)
        and "json_schema" in schema
        and schema.get("type") == "json_schema"
    ):
        response_format = schema
    elif isinstance(schema, dict) and "name" in schema and "schema" in schema:
        response_format = {"type": "json_schema", "json_schema": schema}
    else:
        if strict is None:
            if isinstance(schema, dict) and isinstance(schema.get("strict"), bool):
                strict = schema["strict"]
            else:
                strict = False
        function = convert_to_openai_function(schema, strict=strict)
        function["schema"] = function.pop("parameters")
        response_format = {"type": "json_schema", "json_schema": function}

    if (
        strict is not None
        and strict is not response_format["json_schema"].get("strict")
        and isinstance(schema, dict)
    ):
        msg = (
            f"Output schema already has 'strict' value set to "
            f"{schema['json_schema']['strict']} but 'strict' also passed in to "
            f"with_structured_output as {strict}. Please make sure that "
            f"'strict' is only specified in one place."
        )
        raise ValueError(msg)
    return response_format


def _oai_structured_outputs_parser(
    ai_msg: AIMessage, schema: type[_BM]
) -> Optional[PydanticBaseModel]:
    if parsed := ai_msg.additional_kwargs.get("parsed"):
        if isinstance(parsed, dict):
            return schema(**parsed)
        else:
            return parsed
    elif ai_msg.additional_kwargs.get("refusal"):
        raise OpenAIRefusalError(ai_msg.additional_kwargs["refusal"])
    elif ai_msg.tool_calls:
        return None
    else:
        raise ValueError(
            "Structured Output response does not have a 'parsed' field nor a 'refusal' "
            f"field. Received message:\n\n{ai_msg}"
        )


class OpenAIRefusalError(Exception):
    """Error raised when OpenAI Structured Outputs API returns a refusal.

    When using OpenAI's Structured Outputs API with user-generated input, the model
    may occasionally refuse to fulfill the request for safety reasons.

    See here for more on refusals:
    https://platform.openai.com/docs/guides/structured-outputs/refusals

    .. versionadded:: 0.1.21
    """


def _create_usage_metadata(oai_token_usage: dict) -> UsageMetadata:
    input_tokens = oai_token_usage.get("prompt_tokens") or 0
    output_tokens = oai_token_usage.get("completion_tokens") or 0
    total_tokens = oai_token_usage.get("total_tokens") or input_tokens + output_tokens
    input_token_details: dict = {
        "audio": (oai_token_usage.get("prompt_tokens_details") or {}).get(
            "audio_tokens"
        ),
        "cache_read": (oai_token_usage.get("prompt_tokens_details") or {}).get(
            "cached_tokens"
        ),
    }
    output_token_details: dict = {
        "audio": (oai_token_usage.get("completion_tokens_details") or {}).get(
            "audio_tokens"
        ),
        "reasoning": (oai_token_usage.get("completion_tokens_details") or {}).get(
            "reasoning_tokens"
        ),
    }
    return UsageMetadata(
        input_tokens=input_tokens,
        output_tokens=output_tokens,
        total_tokens=total_tokens,
        input_token_details=InputTokenDetails(
            **{k: v for k, v in input_token_details.items() if v is not None}
        ),
        output_token_details=OutputTokenDetails(
            **{k: v for k, v in output_token_details.items() if v is not None}
        ),
    )


def _create_usage_metadata_responses(oai_token_usage: dict) -> UsageMetadata:
    input_tokens = oai_token_usage.get("input_tokens", 0)
    output_tokens = oai_token_usage.get("output_tokens", 0)
    total_tokens = oai_token_usage.get("total_tokens", input_tokens + output_tokens)

    output_token_details: dict = {
        "audio": (oai_token_usage.get("completion_tokens_details") or {}).get(
            "audio_tokens"
        ),
        "reasoning": (oai_token_usage.get("output_token_details") or {}).get(
            "reasoning_tokens"
        ),
    }
    return UsageMetadata(
        input_tokens=input_tokens,
        output_tokens=output_tokens,
        total_tokens=total_tokens,
        output_token_details=OutputTokenDetails(
            **{k: v for k, v in output_token_details.items() if v is not None}
        ),
    )


def _is_builtin_tool(tool: dict) -> bool:
    return "type" in tool and tool["type"] != "function"


def _use_responses_api(payload: dict) -> bool:
    uses_builtin_tools = "tools" in payload and any(
        _is_builtin_tool(tool) for tool in payload["tools"]
    )
    responses_only_args = {"previous_response_id", "text", "truncation", "include"}
    return bool(uses_builtin_tools or responses_only_args.intersection(payload))


def _construct_responses_api_payload(
    messages: Sequence[BaseMessage], payload: dict
) -> dict:
    # Rename legacy parameters
    for legacy_token_param in ["max_tokens", "max_completion_tokens"]:
        if legacy_token_param in payload:
            payload["max_output_tokens"] = payload.pop(legacy_token_param)
    if "reasoning_effort" in payload:
        payload["reasoning"] = {"effort": payload.pop("reasoning_effort")}

    payload["input"] = _construct_responses_api_input(messages)
    if tools := payload.pop("tools", None):
        new_tools: list = []
        for tool in tools:
            # chat api: {"type": "function", "function": {"name": "...", "description": "...", "parameters": {...}, "strict": ...}}  # noqa: E501
            # responses api: {"type": "function", "name": "...", "description": "...", "parameters": {...}, "strict": ...}  # noqa: E501
            if tool["type"] == "function" and "function" in tool:
                new_tools.append({"type": "function", **tool["function"]})
            else:
                new_tools.append(tool)
        payload["tools"] = new_tools
    if tool_choice := payload.pop("tool_choice", None):
        # chat api: {"type": "function", "function": {"name": "..."}}
        # responses api: {"type": "function", "name": "..."}
        if (
            isinstance(tool_choice, dict)
            and tool_choice["type"] == "function"
            and "function" in tool_choice
        ):
            payload["tool_choice"] = {"type": "function", **tool_choice["function"]}
        else:
            payload["tool_choice"] = tool_choice

    # Structured output
    if schema := payload.pop("response_format", None):
        if payload.get("text"):
            text = payload["text"]
            raise ValueError(
                "Can specify at most one of 'response_format' or 'text', received both:"
                f"\n{schema=}\n{text=}"
            )

        # For pydantic + non-streaming case, we use responses.parse.
        # Otherwise, we use responses.create.
        strict = payload.pop("strict", None)
        if not payload.get("stream") and _is_pydantic_class(schema):
            payload["text_format"] = schema
        else:
            if _is_pydantic_class(schema):
                schema_dict = schema.model_json_schema()
                strict = True
            else:
                schema_dict = schema
            if schema_dict == {"type": "json_object"}:  # JSON mode
                payload["text"] = {"format": {"type": "json_object"}}
            elif (
                (
                    response_format := _convert_to_openai_response_format(
                        schema_dict, strict=strict
                    )
                )
                and (isinstance(response_format, dict))
                and (response_format["type"] == "json_schema")
            ):
                payload["text"] = {
                    "format": {"type": "json_schema", **response_format["json_schema"]}
                }
            else:
                pass
    return payload


def _make_computer_call_output_from_message(message: ToolMessage) -> dict:
    computer_call_output: dict = {
        "call_id": message.tool_call_id,
        "type": "computer_call_output",
    }
    if isinstance(message.content, list):
        # Use first input_image block
        output = next(
            block
            for block in message.content
            if cast(dict, block)["type"] == "input_image"
        )
    else:
        # string, assume image_url
        output = {"type": "input_image", "image_url": message.content}
    computer_call_output["output"] = output
    return computer_call_output


def _pop_summary_index_from_reasoning(reasoning: dict) -> dict:
    """When streaming, langchain-core uses the ``index`` key to aggregate reasoning
    text blocks. OpenAI API does not support this key, so we need to remove it.

    N.B. OpenAI also does not appear to support the ``summary_inex`` key when passed
    back in.
    """
    new_reasoning = reasoning.copy()
    if "summary" in reasoning and isinstance(reasoning["summary"], list):
        new_summary = []
        for block in reasoning["summary"]:
            new_block = {k: v for k, v in block.items() if k != "index"}
            new_summary.append(new_block)
        new_reasoning["summary"] = new_summary
    return new_reasoning


def _construct_responses_api_input(messages: Sequence[BaseMessage]) -> list:
    input_ = []
    for lc_msg in messages:
        msg = _convert_message_to_dict(lc_msg)
        # "name" parameter unsupported
        if "name" in msg:
            msg.pop("name")
        if msg["role"] == "tool":
            tool_output = msg["content"]
            if lc_msg.additional_kwargs.get("type") == "computer_call_output":
                computer_call_output = _make_computer_call_output_from_message(
                    cast(ToolMessage, lc_msg)
                )
                input_.append(computer_call_output)
            else:
                if not isinstance(tool_output, str):
                    tool_output = _stringify(tool_output)
                function_call_output = {
                    "type": "function_call_output",
                    "output": tool_output,
                    "call_id": msg["tool_call_id"],
                }
                input_.append(function_call_output)
        elif msg["role"] == "assistant":
            # Reasoning items
            reasoning_items = []
            if reasoning := lc_msg.additional_kwargs.get("reasoning"):
                reasoning_items.append(_pop_summary_index_from_reasoning(reasoning))
            input_.extend(reasoning_items)
            # Function calls
            function_calls = []
            if tool_calls := msg.pop("tool_calls", None):
                # TODO: should you be able to preserve the function call object id on
                #  the langchain tool calls themselves?
                function_call_ids = lc_msg.additional_kwargs.get(
                    _FUNCTION_CALL_IDS_MAP_KEY
                )
                for tool_call in tool_calls:
                    function_call = {
                        "type": "function_call",
                        "name": tool_call["function"]["name"],
                        "arguments": tool_call["function"]["arguments"],
                        "call_id": tool_call["id"],
                    }
                    if function_call_ids is not None and (
                        _id := function_call_ids.get(tool_call["id"])
                    ):
                        function_call["id"] = _id
                    function_calls.append(function_call)
            # Built-in tool calls
            computer_calls = []
            code_interpreter_calls = []
            mcp_calls = []
            tool_outputs = lc_msg.additional_kwargs.get("tool_outputs", [])
            for tool_output in tool_outputs:
                if tool_output.get("type") == "computer_call":
                    computer_calls.append(tool_output)
                elif tool_output.get("type") == "code_interpreter_call":
                    code_interpreter_calls.append(tool_output)
                elif tool_output.get("type") == "mcp_call":
                    mcp_calls.append(tool_output)
                else:
                    pass
            input_.extend(code_interpreter_calls)
            input_.extend(mcp_calls)
            msg["content"] = msg.get("content") or []
            if lc_msg.additional_kwargs.get("refusal"):
                if isinstance(msg["content"], str):
                    msg["content"] = [
                        {
                            "type": "output_text",
                            "text": msg["content"],
                            "annotations": [],
                        }
                    ]
                msg["content"] = msg["content"] + [
                    {"type": "refusal", "refusal": lc_msg.additional_kwargs["refusal"]}
                ]
            if isinstance(msg["content"], list):
                new_blocks = []
                for block in msg["content"]:
                    # chat api: {"type": "text", "text": "..."}
                    # responses api: {"type": "output_text", "text": "...", "annotations": [...]}  # noqa: E501
                    if block["type"] == "text":
                        new_blocks.append(
                            {
                                "type": "output_text",
                                "text": block["text"],
                                "annotations": block.get("annotations") or [],
                            }
                        )
                    elif block["type"] in ("output_text", "refusal"):
                        new_blocks.append(block)
                    else:
                        pass
                msg["content"] = new_blocks
            if msg["content"]:
                if lc_msg.id and lc_msg.id.startswith("msg_"):
                    msg["id"] = lc_msg.id
                input_.append(msg)
            input_.extend(function_calls)
            input_.extend(computer_calls)
        elif msg["role"] in ("user", "system", "developer"):
            if isinstance(msg["content"], list):
                new_blocks = []
                non_message_item_types = ("mcp_approval_response",)
                for block in msg["content"]:
                    # chat api: {"type": "text", "text": "..."}
                    # responses api: {"type": "input_text", "text": "..."}
                    if block["type"] == "text":
                        new_blocks.append({"type": "input_text", "text": block["text"]})
                    # chat api: {"type": "image_url", "image_url": {"url": "...", "detail": "..."}}  # noqa: E501
                    # responses api: {"type": "image_url", "image_url": "...", "detail": "...", "file_id": "..."}  # noqa: E501
                    elif block["type"] == "image_url":
                        new_block = {
                            "type": "input_image",
                            "image_url": block["image_url"]["url"],
                        }
                        if block["image_url"].get("detail"):
                            new_block["detail"] = block["image_url"]["detail"]
                        new_blocks.append(new_block)
                    elif block["type"] == "file":
                        new_block = {"type": "input_file", **block["file"]}
                        new_blocks.append(new_block)
                    elif block["type"] in ("input_text", "input_image", "input_file"):
                        new_blocks.append(block)
                    elif block["type"] in non_message_item_types:
                        input_.append(block)
                    else:
                        pass
                msg["content"] = new_blocks
                if msg["content"]:
                    input_.append(msg)
            else:
                input_.append(msg)
        else:
            input_.append(msg)

    return input_


def _construct_lc_result_from_responses_api(
    response: Response,
    schema: Optional[type[_BM]] = None,
    metadata: Optional[dict] = None,
) -> ChatResult:
    """Construct ChatResponse from OpenAI Response API response."""
    if response.error:
        raise ValueError(response.error)

    response_metadata = {
        k: v
        for k, v in response.model_dump(exclude_none=True, mode="json").items()
        if k
        in (
            "created_at",
            "id",
            "incomplete_details",
            "metadata",
            "object",
            "status",
            "user",
            "model",
            "service_tier",
        )
    }
    if metadata:
        response_metadata.update(metadata)
    # for compatibility with chat completion calls.
    response_metadata["model_name"] = response_metadata.get("model")
    if response.usage:
        usage_metadata = _create_usage_metadata_responses(response.usage.model_dump())
    else:
        usage_metadata = None

    content_blocks: list = []
    tool_calls = []
    invalid_tool_calls = []
    additional_kwargs: dict = {}
    msg_id = None
    for output in response.output:
        if output.type == "message":
            for content in output.content:
                if content.type == "output_text":
                    block = {
                        "type": "text",
                        "text": content.text,
                        "annotations": [
                            annotation.model_dump()
                            for annotation in content.annotations
                        ],
                    }
                    content_blocks.append(block)
                    if hasattr(content, "parsed"):
                        additional_kwargs["parsed"] = content.parsed
                if content.type == "refusal":
                    additional_kwargs["refusal"] = content.refusal
            msg_id = output.id
        elif output.type == "function_call":
            try:
                args = json.loads(output.arguments, strict=False)
                error = None
            except JSONDecodeError as e:
                args = output.arguments
                error = str(e)
            if error is None:
                tool_call = {
                    "type": "tool_call",
                    "name": output.name,
                    "args": args,
                    "id": output.call_id,
                }
                tool_calls.append(tool_call)
            else:
                tool_call = {
                    "type": "invalid_tool_call",
                    "name": output.name,
                    "args": args,
                    "id": output.call_id,
                    "error": error,
                }
                invalid_tool_calls.append(tool_call)
            if _FUNCTION_CALL_IDS_MAP_KEY not in additional_kwargs:
                additional_kwargs[_FUNCTION_CALL_IDS_MAP_KEY] = {}
            additional_kwargs[_FUNCTION_CALL_IDS_MAP_KEY][output.call_id] = output.id
        elif output.type == "reasoning":
            additional_kwargs["reasoning"] = output.model_dump(
                exclude_none=True, mode="json"
            )
        else:
            tool_output = output.model_dump(exclude_none=True, mode="json")
            if "tool_outputs" in additional_kwargs:
                additional_kwargs["tool_outputs"].append(tool_output)
            else:
                additional_kwargs["tool_outputs"] = [tool_output]
    # Workaround for parsing structured output in the streaming case.
    #    from openai import OpenAI
    #    from pydantic import BaseModel

    #    class Foo(BaseModel):
    #        response: str

    #    client = OpenAI()

    #    client.responses.parse(
    #        model="gpt-4o-mini",
    #        input=[{"content": "how are ya", "role": "user"}],
    #        text_format=Foo,
    #        stream=True,  # <-- errors
    #    )
    if (
        schema is not None
        and "parsed" not in additional_kwargs
        and response.output_text  # tool calls can generate empty output text
        and response.text
        and (text_config := response.text.model_dump())
        and (format_ := text_config.get("format", {}))
        and (format_.get("type") == "json_schema")
    ):
        try:
            parsed_dict = json.loads(response.output_text)
            if schema and _is_pydantic_class(schema):
                parsed = schema(**parsed_dict)
            else:
                parsed = parsed_dict
            additional_kwargs["parsed"] = parsed
        except json.JSONDecodeError:
            pass
    message = AIMessage(
        content=content_blocks,
        id=msg_id,
        usage_metadata=usage_metadata,
        response_metadata=response_metadata,
        additional_kwargs=additional_kwargs,
        tool_calls=tool_calls,
        invalid_tool_calls=invalid_tool_calls,
    )
    return ChatResult(generations=[ChatGeneration(message=message)])


def _convert_responses_chunk_to_generation_chunk(
    chunk: Any,
    schema: Optional[type[_BM]] = None,
    metadata: Optional[dict] = None,
    has_reasoning: bool = False,
) -> Optional[ChatGenerationChunk]:
    content = []
    tool_call_chunks: list = []
    additional_kwargs: dict = {}
    if metadata:
        response_metadata = metadata
    else:
        response_metadata = {}
    usage_metadata = None
    id = None
    if chunk.type == "response.output_text.delta":
        content.append(
            {"type": "text", "text": chunk.delta, "index": chunk.content_index}
        )
    elif chunk.type == "response.output_text.annotation.added":
        content.append(
            {
                "annotations": [
                    chunk.annotation.model_dump(exclude_none=True, mode="json")
                ],
                "index": chunk.content_index,
            }
        )
    elif chunk.type == "response.created":
        response_metadata["id"] = chunk.response.id
    elif chunk.type == "response.completed":
        msg = cast(
            AIMessage,
            (
                _construct_lc_result_from_responses_api(chunk.response, schema=schema)
                .generations[0]
                .message
            ),
        )
        if parsed := msg.additional_kwargs.get("parsed"):
            additional_kwargs["parsed"] = parsed
        usage_metadata = msg.usage_metadata
        response_metadata = {
            k: v for k, v in msg.response_metadata.items() if k != "id"
        }
    elif chunk.type == "response.output_item.added" and chunk.item.type == "message":
        id = chunk.item.id
    elif (
        chunk.type == "response.output_item.added"
        and chunk.item.type == "function_call"
    ):
        tool_call_chunks.append(
            {
                "type": "tool_call_chunk",
                "name": chunk.item.name,
                "args": chunk.item.arguments,
                "id": chunk.item.call_id,
                "index": chunk.output_index,
            }
        )
        additional_kwargs[_FUNCTION_CALL_IDS_MAP_KEY] = {
            chunk.item.call_id: chunk.item.id
        }
    elif chunk.type == "response.output_item.done" and chunk.item.type in (
        "web_search_call",
        "file_search_call",
        "computer_call",
        "code_interpreter_call",
        "mcp_call",
        "mcp_list_tools",
        "mcp_approval_request",
    ):
        additional_kwargs["tool_outputs"] = [
            chunk.item.model_dump(exclude_none=True, mode="json")
        ]
    elif chunk.type == "response.function_call_arguments.delta":
        tool_call_chunks.append(
            {
                "type": "tool_call_chunk",
                "args": chunk.delta,
                "index": chunk.output_index,
            }
        )
    elif chunk.type == "response.refusal.done":
        additional_kwargs["refusal"] = chunk.refusal
    elif chunk.type == "response.output_item.added" and chunk.item.type == "reasoning":
        if not has_reasoning:
            # Hack until breaking release: store first reasoning item ID.
            additional_kwargs["reasoning"] = chunk.item.model_dump(
                exclude_none=True, mode="json"
            )
    elif chunk.type == "response.reasoning_summary_part.added":
        additional_kwargs["reasoning"] = {
            # langchain-core uses the `index` key to aggregate text blocks.
            "summary": [
                {"index": chunk.summary_index, "type": "summary_text", "text": ""}
            ]
        }
    elif chunk.type == "response.reasoning_summary_text.delta":
        additional_kwargs["reasoning"] = {
            "summary": [
                {
                    "index": chunk.summary_index,
                    "type": "summary_text",
                    "text": chunk.delta,
                }
            ]
        }
    else:
        return None

    return ChatGenerationChunk(
        message=AIMessageChunk(
            content=content,  # type: ignore[arg-type]
            tool_call_chunks=tool_call_chunks,
            usage_metadata=usage_metadata,
            response_metadata=response_metadata,
            additional_kwargs=additional_kwargs,
            id=id,
        )
    )
