CVXPY
Maximize
  Sum(X, None, False)
Subject To
 11: max(X, None, False) <= 1.0
Bounds
 X free
End
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AFTER COMPILATION
Minimize
  - C0 - C1 - C2 - C3
Subject To
 R0: C0 - C4 <= 0
 R1: C1 - C4 <= 0
 R2: C2 - C4 <= 0
 R3: C3 - C4 <= 0
 R4: C4 <= 1
Bounds
 C0 free
 C1 free
 C2 free
 C3 free
 C4 free
End
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GUROBI
Maximize
  X[0,0] + X[0,1] + X[1,0] + X[1,1]
Subject To
 11: max_1 <= 1
Bounds
 X[0,0] free
 X[0,1] free
 X[1,0] free
 X[1,1] free
 max_1 free
General Constraints
 GC0: max_1 = MAX ( X[0,0] , X[0,1] , X[1,0] , X[1,1] )
End