Verified ^hot^ | Python 313 Release Notes

As of April 2026, Python 3.13 has moved into a maintenance phase. The most recent stable version is Python 3.13.13

The has historically limited Python applications from utilizing multi-core processors efficiently by forcing single-threaded execution. Python 3.13 introduces an experimental free-threaded build mode that allows threads to run concurrently across multiple CPU cores.

The performance picture for Python 3.13 is nuanced. The free-threaded mode unlocks true concurrency for CPU-bound tasks but penalizes single-threaded performance. The JIT compiler is a promising foundation that does not yet deliver significant speedups. However, for typical single-threaded workflows, Python 3.13 is largely on par with or slightly faster than Python 3.12 for many tasks, with specific improvements seen in simple list comprehensions. python 313 release notes verified

def test(): x = 10 locs = locals() locs['x'] = 20 print(x) # In Python 3.12: prints 20 (unspecified behavior). In Python 3.13: prints 10.

This is a landmark change, but treat it as a preview. Do not run your production web server with python3.13t yet. As of April 2026, Python 3

Prompts, tracebacks, and help menus now feature automatic colorization for better readability.

: Several long-deprecated legacy modules were officially removed, including New DBM Backend dbm.sqlite3 The performance picture for Python 3

: A significantly upgraded REPL based on PyPy, featuring multi-line editing, color support, and interactive help. Experimental Free-Threading (PEP 703) : Users can now run Python without the Global Interpreter Lock (GIL)

The JIT is explicitly marked as experimental and may be removed or completely rewritten in Python 3.14. Its main purpose is to validate the architecture before committing to a full JIT.