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The choice between macos-{14,15,26,latest} is a bit more nuanced because none of them are deprecated by Apple or setup-python. Apple usually supports three versions of macOS. I would pick macos-latest (currently 15) on a repo is not very active to take advantage of setup-python’s effective rolling releases. There would also be a strong argument for jumping to macos-26 as other projects have discovered compatibility issues in doing so and macOS users tend to upgrade faster than users of other operating systems.
cclauss
changed the title
GitHub Actions: macOS 13 runner image is closing down
Upgrade from deprecated macos-13 to macos-15-intel in CI
Oct 30, 2025
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cclauss
changed the title
Replace GitHub Actions runner image
macos-13withmacos-15-intelas recommended in:The currently available GitHub Actions macOS runners are: