pydantic/pydantic-ai v1.86.1

v1.86.1 (2026-04-23)

on GitHub

What's Changed

🐛 Bug Fixes

• fix(openai): guard against choices=None in streamed chunks (#5165) by @adtyavrdhn in #5170
• fix(anthropic): send container_id as string on reuse; unwrap broken {id: x} shape by @adtyavrdhn in #5168
• fix: preserve validation error input on tool-call retries by @DouweM in #5181
• fix(toolsets): prevent MCPServer.__aexit__ called more times than __aenter__ in DynamicToolset by @anishesg in #5171
• Warn about dict fields with Anthropic strict mode by @rahulmansharamani14 in #4321
• Set gen_ai.operation.name=execute_tool on tool-execution spans by @DouweM in #5182
• fix: avoid stale client references in model and embedding classes by @Deeven-Seru in #4276

New Contributors

• @anishesg made their first contribution in #5171
• @rahulmansharamani14 made their first contribution in #4321
• @Deeven-Seru made their first contribution in #4276

Full Changelog: v1.86.0...v1.86.1