Further refinements to the foundational JIT infrastructure designed to boost execution speed.
Note: This article is based on the actual release schedule of Python (3.13.1 was released Dec 6, 2024). For real 2026 news, please check python.org .
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What's New In Python 3.13 — Python 3.14.5rc1 documentation python 3.13.1 release news december 2025
Here is your guide to the features, fixes, and future-proofing in this release.
December 2025 | Status: Stable Maintenance Release
Fixes for the revamped interactive shell, which includes multi-line editing and color support. # Even if an error occurs here, the
One of the most significant shifts in Python's history is the ability to disable the . By December 2025, maintenance releases have continued to refine this "free-threaded" build, allowing threads to run in parallel on multiple CPU cores. This remains an experimental feature that requires a separate build of the interpreter. 2. Just-In-Time (JIT) Compiler Improvements
If you were waiting for the JIT to "settle," 3.13.1 is the green light. You should see a 10-25% speedup in pure Python workloads without changing a single line of code.
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. By December 2025, maintenance releases have continued to
While 3.13.1 still maintains the abi4 stability tag, this release focuses on .
The .1 patch release ensures that if a deferred function raises an exception, it is properly chained to the main exception context, making debugging much easier than in the initial 3.13.0 release.