Python 3.13.1 Release Nov 2025 -

To migrate your Python code to version 3.13.1, follow these steps:

Early adopters of 3.13.0 noticed a 5-10% slowdown in small scripts due to additional checks for the JIT build. Python 3.13.1 introduces runtime heuristics to disable JIT setup overhead for scripts running under 0.1 seconds, restoring micro-performance to 3.12 levels for CLI tools. python 3.13.1 release nov 2025

Based on PyPy, the new REPL introduced multi-line editing, colorized tracebacks, and a more intuitive help system. To migrate your Python code to version 3

Since the .0 release contained major new subsystems (JIT, no-GIL), several edge-case bugs were reported. Python 3.13.1 addresses over 120 issues, including: the new REPL introduced multi-line editing

Python 3.13.1 inherits all the major features introduced in the 3.13 series, including:

A preliminary JIT was introduced to lay the groundwork for significant future performance improvements.