Dinkelsbühl | Germany 12/08/2026 - 15/08/2026

Python 3.13 introduced an experimental build that allows running CPython without the (PEP 703). What’s New In Python 3.13

Python 3.13 was a —it laid the foundation for faster, parallel CPython but left both JIT and no-GIL as opt-in experiments. For most developers, the best features have been better error messages, @override , and internal performance tweaks.

Critical fixes for vulnerabilities in standard library modules like tarfile , http.cookies , and ssl .

December 2025 marks a pivotal moment: Python 3.13 is now the stable default for many new projects, and the community has had a full year to benchmark the "Free-Threaded" builds. Here is the state of Python 3.13 as of December 2025.