2025 - Python Release 3.13.1 December

Allows disabling the Global Interpreter Lock (GIL), enabling threads to run concurrently for true parallelism on multi-core systems.

The release, which arrived in December 2024 , served as the critical first maintenance update for the groundbreaking Python 3.13 series . While the core features of 3.13—such as the experimental JIT compiler and free-threaded mode—were introduced in October, the December 2025 landscape sees this version as a mature, stable choice for production environments. Key Milestones in the Python 3.13 Lifecycle python release 3.13.1 december 2025

All installers now ship with the option pre‑checked (Windows) and a pipx shim for user‑level script installation. Allows disabling the Global Interpreter Lock (GIL), enabling

match payload: case "id": id_, "data": data as whole: process(id_, data, whole) # `whole` holds the entire dict which arrived in December 2024