Pydantic AI Updates: May 24, 2026

1. Pydantic AI v2.0.0b2 mirrors v1.101.0 into the V2 beta with no new breaking changes

Pydantic AI. The second V2 beta shipped roughly twenty minutes after v1.101.0 and folds that feature set into the V2 line without adding any new breaking changes on top of v2.0.0b1, keeping the V2 beta on lockstep parity with the 1.x stable track. Carried across are the pending message queue exposed via ctx.enqueue and agent_run.enqueue, MCP background tasks support, the model-agnostic XSearch fallback that swaps in a subagent when the provider lacks native support, and top_k model settings threaded through GoogleModel, AnthropicModel, and CohereModel. The release also brings forward fixes for AnthropicModel dropping code execution results across multi-turn runs, thinking being silently dropped for Claude Sonnet 4.6 and Opus 4.6 on Bedrock alongside adaptive thinking efforts support, single BaseModel tool arguments being dropped with the default extra='ignore', and Xai tool result IDs requiring xai-sdk 1.6.0 or newer, plus a genai-prices minimum bump. Source