FastAPI 0.158.0 and 0.158.1: combined form models and an OpenAPI fix

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FastAPI 0.158.0 and 0.158.1: combined form models and an OpenAPI fix

Announced: 2026-10-22 (KST). Stable 0.158.0 supports combining form models; 0.158.1 fixes preservation of form media types in OpenAPI. Official GitHub releases and PyPI files with upload timestamps were verified for both versions. Review form-input validation and generated OpenAPI specifications when upgrading.

https://github.com/fastapi/fastapi/releases/tag/0.158.0

https://pypi.org/pypi/fastapi/0.158.0/json

https://github.com/fastapi/fastapi/pull/16577

https://github.com/fastapi/fastapi/releases/tag/0.158.1

https://pypi.org/pypi/fastapi/0.158.1/json

https://github.com/fastapi/fastapi/pull/16579

FastAPI 0.158.2 and 0.159.0 support optional parameter models

Announced 2026-10-22 KST. Version 0.158.2 adds optional Form models; 0.159.0 adds optional Query, Header and Cookie models. Official stable GitHub releases and PyPI wheel/sdist files are confirmed. Developers can review inputs that omit an entire model.

https://github.com/fastapi/fastapi/releases/tag/0.158.2

https://github.com/fastapi/fastapi/releases/tag/0.159.0

https://pypi.org/project/fastapi/0.158.2/

https://pypi.org/project/fastapi/0.159.0/

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