{"generatedAt":"2026-10-24T12:11:27.697Z","canonicalUrl":"https://agentbreakwatch.vercel.app/p/pydantic-ai","llmsTxtUrl":"https://agentbreakwatch.vercel.app/p/pydantic-ai/llms.txt","categoryHub":{"slug":"agent-sdks","title":"AI Agent SDKs & Frameworks Breaking-Change Index","url":"https://agentbreakwatch.vercel.app/c/agent-sdks"},"tldrVerdict":"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. v2.x replaces result_type with output_type on Agent(), and renames result.data to result.output across all run methods.","package":{"slug":"pydantic-ai","packageName":"pydantic-ai","registry":"pypi","kind":"sdk","subcategory":"Agent Framework","displayName":"PydanticAI","vendor":"Pydantic","githubRepo":"pydantic/pydantic-ai","breakingSummary":"v2.x replaces result_type with output_type on Agent(), and renames result.data to result.output across all run methods.","schemaDriftRisk":"high","affectedSymbols":["Agent","RunContext","MCPServerStdio","MCPServerStreamableHTTP"],"migrationBefore":"agent = Agent(\"openai:gpt-4o\", result_type=MyModel)\nresult = await agent.run(\"hello\")\nprint(result.data)","migrationAfter":"agent = Agent(\"openai:gpt-5\", output_type=MyModel)\nresult = await agent.run(\"hello\")\nprint(result.output)","description":"AI Agent Framework, the Pydantic way","latestVersion":"2.61.0","latestPublishedAt":"2026-10-24T03:55:19.172362Z","recentVersions":[{"version":"2.61.0","publishedAt":"2026-10-24T03:55:19.172362Z"},{"version":"2.60.0","publishedAt":"2026-10-23T02:01:51.307613Z"},{"version":"2.59.0","publishedAt":"2026-10-21T05:00:16.335709Z"},{"version":"1.107.9","publishedAt":"2026-10-21T04:59:51.239325Z"},{"version":"1.107.8","publishedAt":"2026-10-20T05:39:19.373806Z"},{"version":"2.58.0","publishedAt":"2026-10-20T05:25:25.699325Z"}],"releasesLast90d":56,"dependenciesCount":31,"license":"MIT","registryUrl":"https://pypi.org/project/pydantic-ai/","githubUrl":"https://github.com/pydantic/pydantic-ai","installCommand":"pip install \"pydantic-ai==2.61.0\"","stabilityScore":70,"stabilityGrade":"C+"}}