CVXPY
Maximize
  Sum(X, None, False)
Subject To
 38: max(X + Y, None, False) <= 1.0
 43: Y == 1.0
Bounds
 X free
 Y free
End
----------------------------------------
AFTER COMPILATION
Minimize
  - x_0 - x_1 - x_2 - x_3
Subject To
 R0: x_4 = 1
 R1: x_5 = 1
 R2: x_6 = 1
 R3: x_7 = 1
 R4: x_0 + x_4 - x_8 <= 0
 R5: x_1 + x_5 - x_8 <= 0
 R6: x_2 + x_6 - x_8 <= 0
 R7: x_3 + x_7 - x_8 <= 0
 R8: x_8 <= 1
Bounds
 x_0 free
 x_1 free
 x_2 free
 x_3 free
 x_4 free
 x_5 free
 x_6 free
 x_7 free
 x_8 free
End
----------------------------------------
GUROBI
Maximize
  X[0,0] + X[0,1] + X[1,0] + X[1,1]
Subject To
 R0: - X[0,0] - Y[0,0] + AddExpression_1[0,0] = 0
 R1: - X[0,1] - Y[0,1] + AddExpression_1[0,1] = 0
 R2: - X[1,0] - Y[1,0] + AddExpression_1[1,0] = 0
 R3: - X[1,1] - Y[1,1] + AddExpression_1[1,1] = 0
 38: max_2 <= 1
 43[0,0]: Y[0,0] = 1
 43[0,1]: Y[0,1] = 1
 43[1,0]: Y[1,0] = 1
 43[1,1]: Y[1,1] = 1
Bounds
 X[0,0] free
 X[0,1] free
 X[1,0] free
 X[1,1] free
 Y[0,0] free
 Y[0,1] free
 Y[1,0] free
 Y[1,1] free
 AddExpression_1[0,0] free
 AddExpression_1[0,1] free
 AddExpression_1[1,0] free
 AddExpression_1[1,1] free
 max_2 free
General Constraints
 GC0: max_2 = MAX ( AddExpression_1[0,0] , AddExpression_1[0,1] ,
   AddExpression_1[1,0] , AddExpression_1[1,1] )
End