Python 3.13.1 Released Dec 2025 Jun 2026

Python 3.13.11 Released (Dec 2025): Stability Meets the "No-GIL" Future

The experimental python3.13t build allows developers to run Python code without the GIL, enabling true parallelism on multi-core processors. Early testing in October and November revealed edge cases in memory management and reference counting. Python 3.13.1 patches several memory leaks and crashes discovered by early adopters testing high-concurrency workloads. python 3.13.1 released dec 2025

At precisely 14:00 UTC on December 16, 2025, the release manager clicked the green “Publish” button. Python 3

CPU-bound tasks, like heavy mathematical computations or data processing, can now see significant speedups without needing complex multiprocessing workarounds. 2. Copy-and-Paste Friendly REPL python 3.13.1 released dec 2025