Released November 27 2025 | Python 3.13.1

python3.13 -c "import sys; print(f'Python sys.version')" # Output: Python 3.13.1 (main, Nov 27 2025, 10:00:00) ...

For decades, the has restricted standard Python programs to a single CPU core per interpreter instance. Python 3.13 tackles this constraint head-on by introducing an experimental free-threaded build mode. python 3.13.1 released november 27 2025