The 3.13 series is defined by three massive shifts that have spent the last year being tested by the community: PEP 719 – Python 3.13 Release Schedule
Published: November 2025
Expect deprecation removals. Use caniusepython3 and pip-check-reqs . python 3.13 release news november 2025
Perhaps the most ambitious undertaking was the introduction of the "free-threaded" build (often referred to as python3.13t ). python 3.13 release news november 2025
Unlike previous attempts at JIT in CPython, the 3.13 implementation utilized a "copy-and-patch" approach. This technique avoids the heavy memory overhead of traditional JITs (like those in Java or V8) by pre-compiling small, optimized binary fragments (stencils) at build time. At runtime, the VM simply copies these fragments and patches them with runtime values. python 3.13 release news november 2025