Pydantic AI Updates: September 24, 2026

1. v2.49.0 Added a GitHub Copilot Device Authorization Flow

Pydantic AI. GitHubCopilotOAuthFlow implements device authorization so an agent can authenticate against GitHub Copilot without a pasted token. The same release added RealtimeSession.wait_for_reply(), which gives callers a blocking point in an otherwise event-driven realtime session. Source

2. TypeSafeModel Learned to Read What the User Wrote About None

Pydantic AI. TypeSafeModel now uses whatever the user wrote describing None as the label for the “none of these” option, and offers whole numbers that are not a rubric as a Choice. A new BoolCriteria lets a schema state what a boolean field’s yes and no actually mean, and a True/False enum can carry the same information. These are all aimed at the same failure mode: the model guessing wrong because the field name carried meaning the schema never expressed. Source