Python 3.15.0 release candidate 2 is out, with final release scheduled for October
Simon Willison's Weblog·low signal
Willison relayed release manager Hugo van Kemenade's 2026-09-01 announcement of the final release candidate for Python 3.15, with the general release set for October. RC2 is the last chance to catch regressions before the API freezes, which matters for anyone maintaining C extensions or pinned toolchains against a 3.14 baseline. Nothing AI-specific, but it fixes the upgrade window for the year.