# PEP 803: Stable ABI for Free-Threaded Builds (packaging thread)

**URL:** <https://discuss.python.org/t/pep-803-stable-abi-for-free-threaded-builds-packaging-thread/104976>\
**Category:** Packaging\
**Tags:** pep\
**Created:** [November 20, 2025, 4:53pm UTC](https://discuss.python.org/t/pep-803-stable-abi-for-free-threaded-builds-packaging-thread/104976 "2025-11-20T16:53:12Z")\
**Posts on this page:** 1\
**Showing post:** 118

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**Author:** ![corona10](https://sea2.discourse-cdn.com/flex002/user_avatar/discuss.python.org/corona10/32/9943_2.png) [@corona10](https://discuss.python.org/u/corona10)\
**Post date:** [March 29, 2026, 1:50pm UTC](https://discuss.python.org/t/pep-803-stable-abi-for-free-threaded-builds-packaging-thread/104976/118 "2026-03-29T13:50:33Z")

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I reposted the same message there for visibility:

> [@PEP 803, round two – “abi3t”: Stable ABI for Free-Threaded Builds](https://discuss.python.org/t/pep-803-round-two-abi3t-stable-abi-for-free-threaded-builds/106181/26):
>
> Hi @encukou and @ngoldbaum, On behalf of the Steering Council, I am happy to share that [PEP 803](https://peps.python.org/pep-0803/) has been approved. Congratulations, and thank you for your work on this PEP. We are particularly pleased to see this align well with the expectation expressed in the [PEP 779](https://peps.python.org/pep-0779/) acceptance post that [Stable ABI for free-threading should be prepared and defined for Python 3.15](https://discuss.python.org/t/pep-779-criteria-for-supported-status-for-free-threaded-python/84319/123). This is a meaningful step toward that goal, and we are glad to see the free-threading work continue on the right path. Warm reg…

Thank you @da-woods for catching this.

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_[View the full topic](https://discuss.python.org/t/pep-803-stable-abi-for-free-threaded-builds-packaging-thread/104976)._