What’s new in Python 3.15 alpha 4?

UTF-8 default encoding, upgraded JIT compiler with 3-4% Linux speedups, new statistical profiler via PEP 799, PyBytesWriter C API, better errors.

When is Python 3.15 stable release?

Scheduled October 2026, after alphas through February, betas from May 5, RCs to July 28.

Is Python 3.15 alpha safe for production?

No — alphas are for testing features and bugs only. Wait for stable.

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Python 3.15 Alpha 4 Lands with UTF-8 Default and JIT Boosts — But a Build Blunder First

Snow blankets Helsinki as the Python release team drops 3.15 alpha 4 — complete with a quirky build mix-up. UTF-8 everywhere and a punchier JIT signal Python's push to stay swift amid rivals.

theAIcatchup Apr 07, 2026 4 min read

Python 3.15.0 alpha 4 release announcement with Helsinki snow backdrop

⚡ Key Takeaways

UTF-8 default eliminates cross-platform encoding woes, a long-overdue consistency win. 𝕏
JIT upgrades deliver measurable speedups (3-4% on Linux, 7-8% on macOS ARM), compounding Python's performance push. 𝕏
Build glitch in alpha 4 highlights open-source realities but doesn't derail the solid feature roadmap. 𝕏

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#JIT compiler #Python 3.15 #Python alpha release #UTF-8 default #alpha release

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Originally reported by Python Insider

⚡ Key Takeaways

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