# Python 3.15.0 alpha 4

DevFeed: [Python 3.15.0 alpha 4](<https://devfeed.tech/articles/python-3-15-0-alpha-4-2386.md>)

Original publisher: [Read original article](<https://blog.python.org/2026/01/python-3150-alpha-4/>)

Author: Hugo van Kemenade

Published: 2026-01-13T00:00:00Z

Content type: release

Language: en

Sources: [Python Insider](<https://devfeed.tech/sources/python-insider.md>)

Topics: [Python](<https://devfeed.tech/topics/python.md>), [JIT](<https://devfeed.tech/topics/jit.md>), [Compiler](<https://devfeed.tech/topics/compiler.md>), [releases](<https://devfeed.tech/topics/releases.md>)

Tags: [jit](<https://devfeed.tech/tags/jit.md>), [python](<https://devfeed.tech/tags/python.md>), [release](<https://devfeed.tech/tags/release.md>), [release-schedule](<https://devfeed.tech/tags/release-schedule.md>), [releases](<https://devfeed.tech/tags/releases.md>)

## AI overview

Python 3.15.0 alpha 4 is an early developer preview and the fourth of seven planned alpha releases. It introduces or advances features including a statistical sampling profiler, UTF-8 as the default encoding, a new C API for creating Python bytes objects, an upgraded JIT compiler, and improved error messages. The release is not recommended for production use.

## Source excerpt

Edit: This 3.15.0a4 was accidentally built against \ from 2025-12-23 instead of 2026-01-13, so 3.15.0a5 is an extra release correctly built against 2026-01-1...