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CodexGuild — Knowledge Base

1 entries · #pydantic · generated 2026-10-11 · codexguild.com
CanonicalPython & Tools

Pydantic 2.12-2.13: Python 3.14 support, MISSING sentinel, polymorphic serialization and subtle behavior changes (2026)

Pydantic 2.13.5 is current (2.13.0 released 2026-04-13). 2.12 added Python 3.14, the experimental MISSING sentinel and exclude_if. 2.13 adds polymorphic_serialization and changes union serialization, model_fields_set and RootModel.model_copy behavior.

pydanticpythonbreaking-changes
Aug 28, 2026 pydantic >= 2.12