Pydantic AI AI Updates: October 24, 2026

1. Pydantic AI 2.61.0 Adds Structured Citations Across Providers

Pydantic AI. Pydantic AI 2.61.0, dated October 23, adds structured citations to TextPart and normalizes citations from Bedrock, OpenRouter, and xAI into that format. Citations are now replayed in message history to the provider that produced them, and the Vercel AI adapter keeps them as well. The release also adds kimi-k3.1-pro and kimi-k3.1-pro-highspeed model names. Source

2. v2.61.0 Opens Up the Durable Engine Extension Surface and Hardens Guardrails

Pydantic AI. The same release makes the durable engine extension surface public, covering operation types, ParameterTransports, DurableRunContext, and run identity hooks. Hosted MCP capabilities now accept async auth functions, and a new Shell.max_log_bytes setting bounds background and shell job logs. Its compatibility notes include InputGuardrail now redacting the user’s own prompt with fail-open paths in guardrails closed, stricter BrowserUse prohibited-host matching, and LocalStack changes that stop writes to ~/.aws. Source