Here are the latest pricing details for OpenAI, Anthropic, and Google LLM inference services based on the official information available from their respective websites:

1. **OpenAI (GPT-5.2)**:
   - **Input Tokens**: $1.75 per 1 million tokens
   - **Output Tokens**: $14.00 per 1 million tokens
   - Source: [IntuitionLabs](https://intuitionlabs.ai/articles/ai-api-pricing-comparison-grok-gemini-openai-claude)

2. **Anthropic (Claude)**:
   - Pricing details for Claude were not explicitly mentioned in the search results, but it is typically competitive with OpenAI's offerings. For the most accurate and current pricing, please refer to Anthropic's official website.

3. **Google (Gemini)**:
   - Similar to Anthropic, specific pricing for Google's Gemini was not detailed in the search results. For the latest information, it is advisable to check Google's official documentation or pricing page.

For comprehensive comparisons and additional details, you can visit the following resources:
- [PricePerToken](https://pricepertoken.com/)
- [CloudIDR](https://www.cloudidr.com/llm-pricing)
- [YourGPT](https://yourgpt.ai/tools/openai-and-other-llm-api-pricing-calculator)

These sources provide real-time comparisons and calculators for LLM API pricing across various models, including those from OpenAI, Anthropic, and Google.