While the initial 3.13.0 release introduced exciting architectural shifts—most notably the experimental Free-Threaded build (removing the Global Interpreter Lock) and the new JIT compiler—version 3.13.1 focuses on ironing out the inevitable rough edges of these major overhauls.
Note: Python 3.13.0 has been superseded by Python 3.13.13. Release date: Oct. 7, 2024. www.python.org PEP 719 – Python 3.13 Release Schedule python 3.13.1 released nov 2025