In benchmarks comparing Python 3.15 and Python 3.14, Python 3.15 was found to be approximately 1.45 times faster overall.

This article is a summary of the official announcement. Confirmation date: 2026-10-15 (confirmation date of 00_seed.md).

Python 3.15 is expected to speed up some programs and simplifies handling immutable data. UTF-8 as standard requires testing.

Python 3.15 is out today as the newest annual feature release for the Python programming language. Python's JIT compiler is ...

Python 3.15 brings native Arm64 support to Windows on Arm, with 94% package compatibility and new GitHub Actions runners.

Official support for free-threaded Python, and free-threaded improvements Python’s free-threaded build promises true parallelism for threads in Python programs by removing the Global Interpreter Lock ...

It's been in the works for a while.

The roadmap was already presented by David Hewitt, maintainer of the Rust binding PyO3, in July at the Python Language Summit ...