Python Release 3.13.1 News November 2025 ((full)) -

One year later, the release of in November 2025 marks the transition from "experimental novelty" to "early production viability." This paper evaluates whether the maintenance release has successfully mitigated the memory overhead issues and JIT stability bugs reported in the initial 3.13.0 rollout.

This experimental mode allows developers to run Python without the Global Interpreter Lock (GIL), enabling true multi-core parallel execution. By late 2025, many popular libraries have updated their C-extensions to support this new ABI. python release 3.13.1 news november 2025