pydantic-ai

PydanticAI by Pydantic

AI Agent Framework, the Pydantic way

Live Registry Versionv2.61.0Previous: v2.60.0Published 2026-10-24

Stability Grade

C+ (70/100)

90-Day Velocity

56 releases

High release cadence

Dependencies

31 direct

PYPI manifest

License

MIT

Verified on PYPI

Recommended Exact Pin: pip install "pydantic-ai==2.61.0"

PYPI Registry ->GitHub Repo ->

TL;DR Verdict & Quick Citation Summary (2026-10-24)Source: AgentBreakWatch Live PYPI Index

PydanticAI (pydantic-ai) is currently at v2.61.0 on PYPI (published 2026-10-24), with a 90-day stability score of 70/100 (C+) and HIGH schema drift risk across 56 releases in the past 90 days. v2.x replaces result_type with output_type on Agent(), and renames result.data to result.output across all run methods. Production teams should pin pip install "pydantic-ai==2.61.0" rather than using unpinned @latest tags.

Breaking Changes & Tool Schema Drift Analysis

v2.x replaces result_type with output_type on Agent(), and renames result.data to result.output across all run methods.

Watched Exports / MCP Tool Signatures:

AgentRunContextMCPServerStdioMCPServerStreamableHTTP

Before (Deprecated / Unpinned Pattern)

agent = Agent("openai:gpt-4o", result_type=MyModel)
result = await agent.run("hello")
print(result.data)

After (Verified v2.61.0 Pattern)

agent = Agent("openai:gpt-5", output_type=MyModel)
result = await agent.run("hello")
print(result.output)

Frequently Asked Questions: pydantic-ai

What is the latest version of pydantic-ai on PYPI?

As of 2026-10-24, the latest stable version of pydantic-ai (PydanticAI by Pydantic) on PYPI is v2.61.0, published on 2026-10-24. It has shipped 56 releases in the last 90 days.

Does pydantic-ai v2.61.0 have breaking changes or MCP schema drift risk?

pydantic-ai currently carries a HIGH schema drift risk rating with a Stability Score of 70/100 (Grade C+). v2.x replaces result_type with output_type on Agent(), and renames result.data to result.output across all run methods.

How do I safely pin pydantic-ai in production?

Avoid unpinned @latest tags in production agent configs. Pin the exact verified version using `pip install "pydantic-ai==2.61.0"` and monitor Agent, RunContext, MCPServerStdio, MCPServerStreamableHTTP for parameter or schema changes.

30-Min Registry & Schema Poller