Exciting news!
PEP 779 ("Criteria for supported status for free-threaded Python") has been accepted, which means free-threaded Python is now a supported build!
We'll drop the "experimental" label already in 3.14 beta 3, due on Tuesday!

PEP 779: Criteria for supported status for free-threaded Python
Hi Thomas, The Steering Council (SC) approves PEP 779, with the effect of removing the “experimental” tag from the free-threaded build of Python 3.14. Along with this, the SC considers the following requirements must be addressed during Phase II. Meeting these ensures that free-threading support can mature into a safe and scalable default in future versions of Python. This is not an exhaustive list, and any other previous requirements should still be met. C API/ABI compatibility and Stable ...