+1 for litestar[1]. The higher bus-factor is nice, and I like that they're working to embrace a wider set of technologies than just pydantic. The framework currently lets you model objects using msgspec[2] (they actually use msgspec for all serialization), pydantic, or attrs[3], and the upcoming release adds some new mechanisms for handling additional types. I really appreciate the flexibility in modeling APIs; not everything fits well into a pydantic shaped box.

[1]: https://litestar.dev/

[2]: https://github.com/jcrist/msgspec

[3]: https://www.attrs.org/en/stable/