Issues

• CP-SAT: fixed worker returns an infeasible "OPTIMAL" from its hint search after importing a shared objective bound; final checker LOG(FATAL)s (Infeasible solution! source: 'fixed [hint]')

  BugLang: PythonSolver: CP-SAT Solver
  google/or-tools#5498 · Filter by author proshkin-aitkn opened on Oct 16, 2026

• Internal persolve crash absl::container_internal::raw_hash_map<>::at

  BugLang: PythonSolver: CP-SAT Solver
  google/or-tools#5494 · Filter by author IgnaceBleukx opened on Oct 15, 2026 · v10.0.0 RC1
  1

  

• Support for python 3.15

  Build: CMakeFeature RequestLang: Python
  google/or-tools#5489 · Filter by author marcelotrevisani opened on Oct 14, 2026 · v10.0
  

• Free MPS export rounds exact integer bounds to six significant digits

  google/or-tools#5481 · Filter by author vera-rubin opened on Oct 12, 2026

• Python 3.14 Windows wheel: Smart App Control blocks unsigned cp_model_helper (9.15.6755)

  Help Needed
  google/or-tools#5474 · Filter by author KUMU-AI opened on Oct 11, 2026
  1

• CP-SAT: objective_value differs from the returned solution after lin_max presolve

  BugSolver: CP-SAT Solver
  google/or-tools#5453 · Filter by author ciriousjoker opened on Oct 3, 2026 · v10.0
  1

  

• java: some MathOpt test failed on Alpine

  BugDockerLang: JavaSolver: MathOpt
  google/or-tools#5429 · Filter by author Mizux opened on Sep 25, 2026 · v10.0
  

• RoutingModel.AddSameActivityGroup unusable from Python — TypeError: argument 2 of type 'absl::Span< int const >'

  BugFeature RequestLang: PythonSolver: Routing & CP Solver
  google/or-tools#5415 · Filter by author PedroOliveira117 opened on Sep 23, 2026 · v10.0
  1

  

• CP-SAT: reproducible first-solution difference between a model with this 21,058-term objective and the same proto with the objective field cleared (Instance23, NRP)

  Help NeededSolver: CP-SAT Solver
  google/or-tools#5400 · Filter by author hyojunguy opened on Sep 20, 2026 · v10.0
  3

  

• python: migrate example/contrib to pybind11

  BugBuild: CMakeLang: Python
  google/or-tools#5398 · Filter by author Mizux opened on Sep 18, 2026 · v10.0
  

• CP-SAT: SIGSEGV in CompiledCircuitConstraint::UpdateGraph when a circuit's enforcement_literal is false

  Solver: CP-SAT Solver
  google/or-tools#5357 · Filter by author proshkin-aitkn opened on Sep 7, 2026 · v10.0
  3

  

• SetCoverLagrangian: stale ThreePhase() declaration, and ComputeLowerBound() segfaults if UseNumThreads() was not called

  BugSolver: Set Cover
  google/or-tools#5341 · Filter by author jg-codes opened on Sep 5, 2026 · v10.0
  

• Allow Dual ray extraction for infeasible LPs when solved using primal simplex in GLOP (via Mathopt)

  Lang: PythonSolver: GLOP
  google/or-tools#5310 · Filter by author krooonal opened on Aug 26, 2026 · v10.0
  5

  

• CP-SAT 9.15.6755: memory-safety regression building large models — std::bad_alloc via repr(IntVar) and heap corruption (0xC0000374) via IntVar.Proto() (works on 9.14)

  Solver: CP-SAT Solver
  google/or-tools#5297 · Filter by author IDrei opened on Aug 19, 2026 · v10.0
  1

  

• # CP-SAT returns a false INFEASIBLE at the root (0 conflicts, 0 branches) with num_search_workers >= 10 and cp_model_presolve = false

  Solver: CP-SAT Solver
  google/or-tools#5295 · Filter by author smoniz opened on Aug 14, 2026 · v10.0
  1

  

• CP-SAT certifies a wrong optimality proof on an all-linear model: adding one constraint lowers the certified optimum by 34% (9.15)

  BugSolver: CP-SAT Solver
  google/or-tools#5293 · Filter by author jipjan opened on Aug 11, 2026 · v10.0.0 RC1
  3

  

• CP-SAT: uncaught std::out_of_range (absl::btree_map::at) in SolutionCrush::SetOrUpdateVarToDomainWithOptionalEscapeValue aborts the process during presolve

  BugSolver: CP-SAT Solver
  google/or-tools#5288 · Filter by author Spira1 opened on Aug 6, 2026 · v10.0
  7

  

• Distributing or-tools with a cpython whl

  BugBuild: CMakeLang: Python
  google/or-tools#5287 · Filter by author sjanzou opened on Aug 6, 2026 · v10.0
  4

  

• AddDimensionWithVehicleTransitAndCapacity returns no solution with optional nodes when capacity requires dropping visits

  Help NeededLang: .NETSolver: Routing & CP Solver
  google/or-tools#5283 · Filter by author hjongit opened on Aug 3, 2026 · v10.0

• [BUG] set_cover Python: integer focus overloads are unreachable, and a bool in_focus mask crashes GreedySolutionGenerator on a fresh invariant

  Lang: Python
  google/or-tools#5278 · Filter by author jg-codes opened on Aug 1, 2026 · v10.0

• GLOP LinearProgram's GetTransposeSparseMatrix fails if not cleaned up

  Solver: Linear Solver
  google/or-tools#5276 · Filter by author discopt opened on Jul 31, 2026 · v10.0
  1

• Build errors in pybind11_protobuf with Protobuf 35.1

  Build: CMakeDependenciesLang: Python
  google/or-tools#5254 · Filter by author kiefernforst opened on Jul 11, 2026 · v10.0
  4

  

• Allow compiling the dependencies as static libraries

  Build: CMakeFeature Request
  google/or-tools#5247 · Filter by author phillip-keldenich opened on Jul 7, 2026 · v10.0
  

• Incompatibility between highspy and or-tools

  BugLang: PythonSolver: HiGHS
  google/or-tools#5246 · Filter by author PTNobel opened on Jul 7, 2026 · v10.0
  

• Publish free-threaded (cp313t/cp314t) wheels for macOS and Windows

  Lang: Python
  google/or-tools#5244 · Filter by author joshlk opened on Jul 5, 2026 · v10.0
  1