Pydantic AI Updates: June 3, 2026

1. Pydantic AI v2.0.0b5 Adds On-Demand Loading and Grok 4.3 Support

Pydantic AI. The v2.0.0b5 beta adds on-demand (deferred) loading for instructions, tools, model settings, and hooks, and folds in changes from v1.105.0. It also adds support for Grok 4.3 reasoning_effort and fixes gateway model construction in Temporal workflows and GoogleModelSettings.google_cached_content behavior. The release continues the path toward the framework’s 2.0 line. Source