solver.status_name() raises TypeError: 'ortools.sat.python.cp_model_helper.CpSolverStatus' object is not callable

[gacheiro]

What version of OR-Tools and what language are you using?
Version: v9.15.6755
Language: Python

Which solver are you using (e.g. CP-SAT, Routing Solver, GLOP, BOP, Gurobi)
solver: CP-SAT

What operating system (Linux, Windows, ...) and version?
OS: Linux

What did you do?
After solving a model with the CP-SAT solver, the callable solver.status_name() raises:

TypeError: 'ortools.sat.python.cp_model_helper.CpSolverStatus' object is not callable

Steps to reproduce the behavior:

model = cp_model.CpModel()
model.minimize(1)
solver = cp_model.CpSolver()
status = solver.Solve(model)
print(solver.status_name())

What did you expect to see
Should print "OPTIMAL"

What did you see instead?
TypeError: 'ortools.sat.python.cp_model_helper.CpSolverStatus' object is not callable

It works for version 9.14.6206

[Mizux]

Confirmed using any sat sample: ortools/sat/samples/binpacking_problem_sat.py and changing it.

workaround use the "old" version:

status = solver.Solve(model)
print(solver.status_name(satus))

devNote:

diff --git a/ortools/sat/samples/binpacking_problem_sat.py b/ortools/sat/samples/binpacking_problem_sat.py
index 29bbe84da1..cabf3296a0 100644
--- a/ortools/sat/samples/binpacking_problem_sat.py
+++ b/ortools/sat/samples/binpacking_problem_sat.py
@@ -69,7 +69,8 @@ def binpacking_problem_sat():
     # Solves and prints out the solution.
     solver = cp_model.CpSolver()
     status = solver.solve(model)
-    print(f"solve status: {solver.status_name(status)}")
+    print(f"solve status old: {solver.status_name(status)}") # pass
+    print(f"solve status new: {solver.status_name()}") # fail
     if status == cp_model.OPTIMAL:
         print(f"Optimal objective value: {solver.objective_value}")
     print("Statistics")

[Mizux]

same issue on main:

trace:

./build/python/venv/bin/python ortools/sat/samples/binpacking_problem_sat_hacked.py
Traceback (most recent call last):
  File "ortools/sat/samples/binpacking_problem_sat.py", line 82, in <module>
    binpacking_problem_sat()
    ~~~~~~~~~~~~~~~~~~~~~~^^
  File "ortools/sat/samples/binpacking_problem_sat.py", line 72, in binpacking_problem_sat
    print(f"solve status 1: {solver.status_name()}")
                             ~~~~~~~~~~~~~~~~~~^^
  File "build/python/venv/lib/python3.13/site-packages/ortools/sat/python/cp_model.py", line 1955, in status_name
    status = self._checked_response.status()
TypeError: 'ortools.sat.python.cp_model_helper.CpSolverStatus' object is not callable

[Mizux]

To Fix, you can modify locally your site-packages/ortools/sat/python/cp_model.py
note: you can use python3 -m pip show ortools to find location

diff -u ortools/sat/python/cp_model.py build/python/venv/lib/python3.13/site-packages/ortools/sat/python/cp_model.py
--- ortools/sat/python/cp_model.py	2026-01-05 12:48:19.952391675 +0100
+++ build/python/venv/lib/python3.13/site-packages/ortools/sat/python/cp_model.py	2026-01-15 11:18:00.654856848 +0100
@@ -1952,7 +1952,7 @@
     def status_name(self, status: Optional[Any] = None) -> str:
         """Returns the name of the status returned by solve()."""
         if status is None:
-            status = self._checked_response.status()
+            status = self._checked_response.status
         return status.name
 
     def solution_info(self) -> str: