Pydantic AI

Typed Python SDK for building agents with swappable model providers, plus optional capabilities for memory, sub-agents, planning and durable execution.

Harness by Pydantic

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pip install pydantic-ai

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About

Pydantic AI is a Python SDK built around a typed agent loop where changing the model is a string swap. A separate Pydantic AI Harness adds capabilities such as memory, guardrails, sub-agents, planning, context management and persistence, up to a ready-made coding agent. Related packages cover evals and typed graph control flow, and instrumentation is plain OpenTelemetry with Logfire as the companion platform. The docs list many model providers and durable execution integrations such as Temporal, DBOS, Prefect and AWS Lambda.

Use cases: agent-orchestration

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Fact sheet

Languages: PythonREADME
Packages: pydantic-ai (pypi)README
Multi-agent: YesREADME
Orchestration: graphREADME
MCP support: Built inpydantic.dev
Memory: short-termpydantic.dev
Observability: OpenTelemetry, LogfireREADME
Deploys to: aws-lambda, temporal, dbos, prefect, restate, apache-airflowpydantic.dev
Model providers: openai, anthropic, google, aws-bedrock, azure-openai, cohere, deepseek, groq, huggingface, meta, mistral, ollama, xaipydantic.dev
Maturity: Stablegithub.com

Facts extracted by Claude Sonnet 5.5 from the linked sources on Oct 24, 2026; reviewed Oct 24, 2026. Wrong fact? Tell us.

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Stars: 20,838
Forks: 3,016
Open issues: 1,035
Weekly downloads: 1,516,568
Last commit: Oct 24, 2026 (2 days ago)
Last release: Oct 24, 2026 (3 days ago)
Last package publish: Oct 24, 2026 (3 days ago)

From GitHub (fetched Oct 24, 2026) and the package registry.

Details

Packages: pypi pydantic-ai
License: MIT
Repository: github.com/pydantic/pydantic-ai
Website: ai.pydantic.dev/
Docs: ai.pydantic.dev/
First seen: Oct 24, 2026
Last checked: Oct 24, 2026
Source: README Website Docs github-graphql