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OpenJun 9, 2026
Due by July 14, 2026
•Last updated - Bazel 9.0.0 required
- SCIP 10.0.0 with
Papilo(3.0.0),Soplex(8.0.0) andSYM=snautyenable - Python: migrate from SWIG to pybind11 for routing and constraint_solver python wrapper
- routing:
- prefix Routing removed for all class
- use of
routingnamespace aka operations_research::RoutingModel->operations_research::routing::Model`
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Cut generators in CPModelProto
Feature RequestMissing Feature/WrapperMissing Feature/WrapperSolver: CP-SAT SolverRelates to the CP-SAT solverRelates to the CP-SAT solverStatus: Open.#912 In google/or-tools;Colab Session Crash (F0000 Error) with VRP including Time Windows on Specific Data
Help NeededModeling/Usage problemModeling/Usage problemLang: PythonPython wrapper issuePython wrapper issueSolver: RoutingUses the Routing library and the original CP solverUses the Routing library and the original CP solverStatus: Open.#4683 In google/or-tools;Crash upon duplicate constraint name
Lang: JavaJava wrapper issueJava wrapper issueSolver: CBC/CLPIssue specific to Coin-OR CBC/CLPIssue specific to Coin-OR CBC/CLPStatus: Open.#4764 In google/or-tools;Fuzztest build is borken
Build: BazelBazel based build issueBazel based build issueBuild: CMakeCMake based build issueCMake based build issueLang: C++Native implementation issueNative implementation issueStatus: Open.[Windows] MSVC Compilation Error: C2001 and C2143 in multiple source files (e.g., routing_lp_scheduling.cc)
Build: CMakeCMake based build issueCMake based build issueOS: WindowsWindows OSWindows OSStatus: Open.#4772 In google/or-tools;Bug in Routing Solver when using amortized vehicle cost
Lang: JavaJava wrapper issueJava wrapper issueSolver: RoutingUses the Routing library and the original CP solverUses the Routing library and the original CP solverStatus: Open.#3054 In google/or-tools;cmake(MSVC): building ortools_full.lib is not working in Debug
Build: CMakeCMake based build issueCMake based build issueLang: C++Native implementation issueNative implementation issueOS: WindowsWindows OSWindows OSStatus: Open.#3822 In google/or-tools;VRP with breaks minor bug?
Solver: RoutingUses the Routing library and the original CP solverUses the Routing library and the original CP solverSolver: Routing - breakRouting break related issueRouting break related issueStatus: Open.#4234 In google/or-tools;ROUTING_OPTIMAL is not part of the documentation
Doc: Optimization SiteIssue related to https://developers.google.com/optimization/ or Documentation in generalIssue related to https://developers.google.com/optimization/ or Documentation in generalSolver: RoutingUses the Routing library and the original CP solverUses the Routing library and the original CP solverStatus: Open.#4317 In google/or-tools;Potential performance degradation comparing version 9.10.4067 with 9.11.4210.
Solver: CP-SAT SolverRelates to the CP-SAT solverRelates to the CP-SAT solverStatus: Open.#4406 In google/or-tools;Error initializing DefaultRoutingSearchParameters: default '0.5' for field operations_research.sat.SatParameters.clause_cleanup_ratio of type 1
Lang: PythonPython wrapper issuePython wrapper issueSolver: CP-SAT SolverRelates to the CP-SAT solverRelates to the CP-SAT solverSolver: RoutingUses the Routing library and the original CP solverUses the Routing library and the original CP solverStatus: Open.#4427 In google/or-tools;The CP-SAT solution in VRP Routing Solver is not returned
Solver: CP-SAT SolverRelates to the CP-SAT solverRelates to the CP-SAT solverStatus: Open.#4439 In google/or-tools;MathOpt: python_math_opt_solver_test failed on macOS and Windows
Lang: PythonPython wrapper issuePython wrapper issueOS: MacMacOSMacOSOS: WindowsWindows OSWindows OSSolver: MathOptMathOpt related issueMathOpt related issueStatus: Open.Breaks add unnecessary slack at the beginning of routes // and improved support for breaks.
Help NeededModeling/Usage problemModeling/Usage problemLang: PythonPython wrapper issuePython wrapper issueOS: WindowsWindows OSWindows OSSolver: RoutingUses the Routing library and the original CP solverUses the Routing library and the original CP solverSolver: Routing - breakRouting break related issueRouting break related issueStatus: Open.#4564 In google/or-tools;routing(.Net): Span upper bounds causing broken depot time windows
Lang: .NET.Net wrapper issue.Net wrapper issueOS: WindowsWindows OSWindows OSSolver: RoutingUses the Routing library and the original CP solverUses the Routing library and the original CP solverStatus: Open.#4573 In google/or-tools;cmake:python: stubgen timeout on macos intel
Build: CMakeCMake based build issueCMake based build issueLang: PythonPython wrapper issuePython wrapper issueOS: MacMacOSMacOSStatus: Open.Windows CP-SAT: Significant Drop in CPU Utilization After Initial Solutions
OS: WindowsWindows OSWindows OSSolver: CP-SAT SolverRelates to the CP-SAT solverRelates to the CP-SAT solverStatus: Open.#4615 In google/or-tools;IntVarLocalSearchFilter Initialization Failure in Python
Lang: PythonPython wrapper issuePython wrapper issueSolver: RoutingUses the Routing library and the original CP solverUses the Routing library and the original CP solverStatus: Open.module source tree too large error when using go get to install
Lang: GolangGolang wrapper issueGolang wrapper issueStatus: Open.#4624 In google/or-tools;SetAllowedVehiclesForIndex default behavior is not what it should be.
Help NeededModeling/Usage problemModeling/Usage problemLang: C++Native implementation issueNative implementation issueSolver: RoutingUses the Routing library and the original CP solverUses the Routing library and the original CP solverStatus: Open.#4644 In google/or-tools;pywraplp broken on Linux void musl
Help NeededModeling/Usage problemModeling/Usage problemLang: PythonPython wrapper issuePython wrapper issueOS: LinuxGNU/Linux OSGNU/Linux OSStatus: Open.#4736 In google/or-tools;MathOpt: some cpp tests are flaky
Lang: C++Native implementation issueNative implementation issueOS: MacMacOSMacOSSolver: MathOptMathOpt related issueMathOpt related issueStatus: Open.- Status: Open.#4864 In google/or-tools;
Knitro interface
Feature RequestMissing Feature/WrapperMissing Feature/WrapperSolver: Linear SolverRelated to all Linear Solver (GLOP, BOP, CBC etc...)Related to all Linear Solver (GLOP, BOP, CBC etc...)Status: Open (in progress).[WIP] Add the horizontal elastic timetable overload checking rule to the cumulative constraint.
Feature RequestMissing Feature/WrapperMissing Feature/WrapperSolver: CP-SAT SolverRelates to the CP-SAT solverRelates to the CP-SAT solverStatus: Draft (not ready).