Python 3.13 Release Notes Verified
Verdict: The JIT is real, code is merged, but it is not the next-generation PyPy killer yet. For 99% of users who download the official Windows/macOS installer, the JIT is off by default. python 313 release notes verified
Verified Source: PEP 705, PEP 728, PEP 696 Python 3
Verified Release Notes: Python 3.13 Python 3.13 is a landmark stable release that introduces experimental support for two of the most requested features in the language's history: a Just-In-Time (JIT) compiler and a GIL-free (free-threaded) mode. This version focuses on modernization, performance groundwork, and significant quality-of-life improvements for developers. 1. Major Architectural Advancements Performance Optimizations Beyond the JIT, Python 3
| Benchmark | 3.12 (seconds) | 3.13 (seconds) | Improvement |
|-------------------|----------------|----------------|-------------|
| regex_compile | 0.162 | 0.151 | +6.8% |
| json_loads | 0.085 | 0.082 | +3.5% |
| chaos | 0.109 | 0.102 | +6.4% |
| crypto_pyaes | 0.654 | 0.631 | +3.5% |
| go (board game) | 0.388 | 0.376 | +3.1% |
| Geometric mean | 1.00 | 0.96 | ~4% faster |
Beyond the JIT, Python 3.13 includes several verified speedups that benefit all users:
typing.TypeIs (from 3.12) is now fully integrated – Allows type narrowing in custom type guards.