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Pydantic AI. Build AI assistants that work reliably with real data.

pydantic.dev/pydantic-ai

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Problem

The full read on this project is a sign-in away — what it solves, who it serves, and where it sits in the market.

Audience

The full read on this project is a sign-in away — what it solves, who it serves, and where it sits in the market.

Market

The full read on this project is a sign-in away — what it solves, who it serves, and where it sits in the market.

Pricing

The full read on this project is a sign-in away — what it solves, who it serves, and where it sits in the market.

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Updates

July 2026

Update FastMCP dependency range to `<4` (#6737) Jul 25
Release —v2.18.0 (2026-07-24) Jul 25
Clarify `BedrockMantleProvider` interface contracts (#6726) Jul 24
docs(agents): push-and-watch rule for agent contributors (#6721) Jul 24
Add `BedrockMantleProvider` and normalize response-scoped tool-call I… Jul 24
Document faster structured output streaming (#6533) Jul 24
Enforce specific rule codes on type-ignore comments with ruff `PGH003… Jul 24
test(mistral): verify prompt cache with history (#6719) Jul 24
Fix inline snapshots for arbitrary `RequestUsage` and `RunUsage` fiel… Jul 24
test: enforce prompt-cache wire-prefix stability across all recorded … Jul 24
Document the message round-trip fidelity contract (#6359) Jul 24
Add FAQ on deferred tools, tool search, and prompt caching (#6083) Jul 24
Add `external_web_access` option to `WebSearchTool` for OpenAI Respon… Jul 24
Add 'us'/'eu' multi-region locations to GoogleCloudProvider location … Jul 24
Map deferred `google-genai` stream errors in `GoogleModel` (#6693) Jul 24
Clarify OpenRouter Advisor observability wording (#6711) Jul 24
Add `AdvisorTool` support for Anthropic and OpenRouter (#6605) Jul 24
Release —v2.17.0 (2026-07-23) Jul 24
Cache per-message OTel serialization to avoid `O(n²)` instrumentation… Jul 23
Normalize the non-deterministic `Tasks completed` output in the `Redu… Jul 23
chore: use specific `pyright: ignore` rule codes and document `run_st… Jul 23
docs(tests): pin recorded facts in test assertions, not cassettes (#6… Jul 23
Release —v2.16.0 (2026-07-22) Jul 23
Release —v2.15.0 (2026-07-21) Jul 22
Release —v2.14.1 (2026-07-20) Jul 21
Release —v2.14.0 (2026-07-20) Jul 21
Release —v2.13.0 (2026-07-17) Jul 18
Release —v2.12.0 (2026-07-16) Jul 17
Release —v2.11.0 (2026-07-15) Jul 16
Release —v2.10.0 (2026-07-14) Jul 15