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MiniZinc

MiniZinc is a high-level constraint modelling language that allows you to easily express and solve discrete optimisation problems.

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Latest release: 2.9.6 (changelog)

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MiniZinc is developed at Monash University with support from OPTIMA.

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Try MiniZinc

Try one of the examples, or write your own model.

Why choose MiniZinc?

  • High-level language

    Model constraint satisfaction and optimisation problems using readable, intuitive logical constructs, with full type safety.

  • Solver independent

    Run the same model using a variety of different solver technologies, without being locked into a particular solver.

  • Pre-defined constraints

    MiniZinc features a large library of pre-defined constraints, making modelling complex relationships simple.

  • Fully featured development environment

    Use the MiniZinc IDE to write and run models, visualise search and solutions, profile performance and more.

  • In-depth learning materials

    MiniZinc has comprehensive documentation, including the tutorial, several courses, the user manual, and library documentation.

  • Integrate MiniZinc into your project

    MiniZinc can be embedded into Python and JavaScript programs, and can even be used entirely from within the browser.

Latest Release

MiniZinc 2.9.6

Released 24 April 2026

  • Xpress solver migration from BCL to C API with support for Xpress 9.8 parameters. Add support for indicator constraints, warm start, and convex quadratic inequalities.
  • The compiler now removes all non-array right-hand sides from variable declarations in FlatZinc. This minimizes the effort required when parsing .fzn or FlatZinc JSON files.
  • Add support for SCIP 10, and remove support for SCIP 7 and earlier (issue 999).
  • Add versions of count_* constraints for booleans, floats and sets of integers to allow solvers to support them natively (issue 1005).
  • Add the --cleanup-time-limit option for configuring the grace period for solver cleanup before forced termination (issue 994).
  • Plus 15 bugfixes!

See the full changelog.

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