Python 3.13.1 Release News December 2025 [better]

Stability improvements for the experimental build that allows running Python without the Global Interpreter Lock (GIL).

The copy-and-patch JIT compiler, introduced in 3.13, has been optimized to reduce memory overhead. Early benchmarks show a 5-10% performance improvement in long-running numerical loops compared to the initial 3.13.0 release. python 3.13.1 release news december 2025

Python 3.13.1 was released on , as the first bugfix update to the major 3.13 series. By December 2025, it was superseded by newer versions like Python 3.14, but it remains a critical maintenance release for those on the 3.13 lifecycle. Overview of Python 3.13.1 introduced in 3.13