---
title: "Python Insider: Python 3.15.0 alpha 5 (yes, another alpha!)"
url: https://daily.dev/posts/python-insider-python-3-15-0-alpha-5-yes-another-alpha--ixq3eg6iw
source_url: https://pythoninsider.blogspot.com/2026/01/python-3150-alpha-5-yes-another-alpha.html
type: article
source: "Python Insider"
published: 2026-01-14T17:40:20.132Z
updated: 2026-02-27T19:30:08.327Z
tags: ["python", "performance"]
reading_time: 2
upvotes: 0
comments: 0
language: en
---

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# Python Insider: Python 3.15.0 alpha 5 (yes, another alpha!)

**[Python Insider](https://daily.dev/sources/python)** · 2 min read · 0 upvotes · 0 comments

## Summary

Python 3.15.0 alpha 5 has been released as the fifth of eight planned alpha releases. This corrects an accidental build issue from alpha 4. Major new features include PEP 799's statistical sampling profiler, UTF-8 as the default encoding (PEP 686), a new PyBytesWriter C API (PEP 782), and significant JIT compiler upgrades showing 3-4% performance improvements on x86-64 Linux and 7-8% on AArch64 macOS. The beta phase begins May 5, 2026, with the next alpha scheduled for March 10, 2026.

## Full article

daily.dev links to this article rather than hosting it. Read it at the original source: <https://pythoninsider.blogspot.com/2026/01/python-3150-alpha-5-yes-another-alpha.html>

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---

Tags: [#python](https://daily.dev/tags/python), [#performance](https://daily.dev/tags/performance)

[View this post on daily.dev](https://daily.dev/posts/python-insider-python-3-15-0-alpha-5-yes-another-alpha--ixq3eg6iw)