Python 313 Release Notes Verified May 2026
Python 3.13 was officially released on October 7, 2024 . This major update introduces foundational changes to Python's performance and developer experience, most notably the experimental "free-threaded" mode and a Just-In-Time (JIT) compiler. Key Verified Release Highlights Experimental Free-Threaded Mode (PEP 703)
New / Enhanced Modules
Global Interpreter Lock (GIL)
For decades, the has prevented Python from running multiple threads truly in parallel on multi-core processors. Python 3.13 introduces an experimental build that allows you to disable the GIL. What's New In Python 3.13 — Python 3.14.4 documentation python 313 release notes verified
Python 3.13 removes several long-deprecated features. If you maintain code from the Python 2 era, pay attention. Python 3
Experimental JIT:
A preliminary Just-In-Time compiler for performance gains. The GC’s "young" and "old" generations are processed
- The GC’s "young" and "old" generations are processed in smaller steps.
- The
gcmodule now exposes new tuning options:gc.get_config()andgc.get_stats()provide deeper insight. - Finalizers (
__del__) are now handled more predictably to avoid resurrection cycles.