Python 313 Release Notes Verified [better] Jun 2026

This article breaks down the verified highlights of Python 3.13, helping you understand what’s stable, what’s experimental, and what you can start using today.

In the quiet hours of a rainy Tuesday, Alex sat before a glowing terminal, the soft hum of the radiator the only sound in the room. For months, the rumors had been building—whispers of a version that would change everything. Today, the official release notes for Python 3.13 were finally verified.

You can expect a 5-10% speedup on pure-Python numeric loops without any code changes.

Python 3.13.0 final, released October 7, 2024. python 313 release notes verified

⚠️ Free-threaded mode: --disable-gil currently increases single-threaded overhead by ~5–10%.

The cgi module's removal is significant for legacy web applications. Many old Python 2-era scripts that used cgi.FieldStorage() will fail.

What is the actual speed improvement for regular code (without the experimental JIT)? The Python core team publishes the pyperformance benchmark suite. Verified results from Python 3.13 vs 3.12: This article breaks down the verified highlights of Python 3

| Feature | Status | Verified Source | |---------|--------|-----------------| | New interactive REPL | ✅ Released | docs.python.org/whatsnew/3.13.html | | Experimental free-threaded build (PEP 703) | ✅ Released | PEP 703 + docs.python.org | | Experimental JIT compiler (PEP 744) | ✅ Released | PEP 744 + docs.python.org | | typing.TypeIs (PEP 742) | ✅ Released | PEP 742 | | Type parameter defaults (PEP 696) | ✅ Released | PEP 696 | | @warnings.deprecated (PEP 702) | ✅ Released | PEP 702 | | ReadOnly TypedDict (PEP 705) | ✅ Released | PEP 705 | | PEP 594 removals | ✅ Released | PEP 594 | | macOS 10.13+ support | ✅ Released | docs.python.org | | iOS/Android Tier 3 support | ✅ Released | PEP 730, PEP 738 | | mimalloc integration | ✅ Released | docs.python.org | | WASI Tier 2 support | ✅ Released | PEP 11 |

Python 3.13 introduces an experimental build that allows developers to completely . This structural change marks the beginning of true, concurrent multi-threading for multi-core processors.

| Improvement | Description | | --- | --- | | Performance Enhancements | Improved execution speed and reduced memory usage | | Updated Standard Library | New modules and functions | | Better Support for Concurrency | Improved support for concurrency using asyncio | Today, the official release notes for Python 3

For full technical specifications, developers can refer to the official Python 3.13 Documentation . What's New In Python 3.13 — Python 3.14.4 documentation

Following the deprecation roadmap established in PEP 594, Python 3.13 officially purges legacy, unmaintained standard library modules to reduce the interpreter's footprint. What's New In Python 3.13 — Python 3.14.5 documentation

from typing import TypedDict, ReadOnly