Physix Frontier · News Briefing Card (IT Home · Oct 15, 2026)

Microsoft: 94% of Top PyPI Packages Now Native on Windows on Arm

KEY FACTS

Python 3.15 was released last week, and on WoA devices it defaults to the native Arm64 interpreter.
CPython's support level for Windows on Arm has reached Tier 2.
As of last month, 94% of the top 1000 PyPI packages by downloads natively support WoA.
The Anaconda repository has over 2500 packages that support WoA.
Microsoft's data only reflects wheel package availability, not end-to-end compatibility.

KEY DATA

94%Native WoA support rate for top PyPI packages

Over 2500Number of Anaconda packages supporting WoA

Tier 2CPython WoA support level

3.15Python version

PHYSIX OBSERVATION

The software ecosystem for Arm-based Windows has long been a weak spot, and this catch-up by the core Python toolchain is significant: developers switching machines no longer have to worry about being unable to install packages. But 94% is only a wheel-level number; whether things actually run smoothly still depends on end-to-end verification. Microsoft should not treat installability as compatibility completed.

Source: IT Home report