Python 3.13 freethreading support

[davidhewitt]

With the advent of Python 3.13 coming up, worth opening an issue here to track status of Pydantic's support for the new "freethreaded" Python 3.13.

The main blocker for us supporting is the Rust portion in pydantic-core, which depends on PyO3. PyO3 is tracking freethreaded support at PyO3/pyo3#4265

The expectation is that PyO3 will have an initial version which supports freethreaded builds soon, after which point we can begin supporting freethreaded Python in pydantic-core.

[samimia-swks]

Seems like pyO3 supported free-threaded python now: https://github.com/PyO3/pyo3/releases

I hope this is a priority :)

[davidhewitt]

Best to start by tracking the pydantic-core support at pydantic/pydantic-core#1555 - we're working on it :)

[davidhewitt]

pydantic-core now supports free-threading, the expectation is we will ship this as part of Pydantic 2.11.