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Pydantic AI Updates: April 24, 2026

pydantic-ai python agents

1. Pydantic AI v1.86.1 Patches Streaming and Tool-Retry Edge Cases

Pydantic AI. The v1.86.1 patch release fixes a cluster of production-ish bugs: guards against choices=None in streamed chunks from OpenAI and Anthropic providers, corrected Anthropic container-ID handling, preservation of validation-error input on tool-call retries, and a fix for MCPServer context-manager imbalances. Nothing headline-grabbing, but a useful set of stability fixes for teams using streaming plus tool calls plus MCP together — the combination that tends to surface all three of these issues. Source