Python 3.13.1 Released Nov 2025 Jun 2026

The removal of the GIL in 3.13 was the most talked-about feature in years. Version 3.13.1 includes significant stability patches for the free-threaded build (available via the --disable-gil build flag).

Since Python 3.13.1 is a future/hypothetical release (following the standard .0 release in October), this content focuses on the typical role of a .1 release: python 3.13.1 released nov 2025

While 3.13.1 stabilizes the No-GIL mode, the ecosystem (NumPy, Pandas, PyTorch) is still in the early stages of supporting free-threaded execution. You can safely use 3.13.1 for its performance improvements, but wait on the --disable-gil flag until your core libraries officially announce support. The removal of the GIL in 3