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Gecode 6.5.0 was released on 31 October 2026.
Gecode 6.5.0 makes Gecode's test harness available to downstream projects, adds search worker control, open variable lists, and new arithmetic and distance constraints, and includes correctness and memory fixes. It also includes experimental A* and CABS search engines, which are disabled by default. This is a source-only release.
Source archives: https://www.gecode.dev/download/
Documentation: https://www.gecode.dev/doc/6.5.0/
Changelog: https://www.gecode.dev/doc/6.5.0/reference/PageChange.html