Is LangGraph better than Pydantic AI?

LangGraph ranks higher in our list of AI agent frameworks and tooling (#2 against #4, score 90.5 against 86.5). LangGraph is best for: stateful agents that need explicit control of each step. Pydantic AI is best for: typed Python agents for Pydantic users.

Which is cheaper, LangGraph or Pydantic AI?

LangGraph: MIT-licensed library is free; LangSmith hosting is a separate paid service. Pydantic AI: MIT-licensed and free; the optional Pydantic Logfire tracing service has a free tier.

Do LangGraph and Pydantic AI run on the same platforms?

LangGraph supports Self-hosted. Pydantic AI supports Windows, macOS, Linux.

Comparison · AI agent frameworks and tooling

LangGraph vs Pydantic AI: which is better in 2026?

LangGraph90.5#2 in best AI agent frameworks and tooling

Pydantic AI86.5#4 in best AI agent frameworks and tooling

LangGraph ranks higher in our list of AI agent frameworks and tooling (#2 against #4, score 90.5 against 86.5).

How we rank Share

90.5
Editorial score
86.5
1
Platforms
3
Yes
Free to use
Yes
Yes
Open source
Yes

Which should you choose?

Choose LangGraph if you want

Stateful agents that need explicit control of each step.

MIT-licensed graph runtime for agents, with durable state and human pauses, from the LangChain team. It sits under LangChain here as the lower-level layer, and LangSmith hosting is a separate paid service.

Choose Pydantic AI if you want

Typed Python agents for Pydantic users.

Typed Python agents with OpenTelemetry tracing and an MIT license. Tracing is easiest with the separate Logfire service, and the library suits teams already using Pydantic.

The main differences

Only Pydantic AI runs on Linux.
Only Pydantic AI runs on Windows.
Only Pydantic AI runs on macOS.

Side by side

	LangGraph	Pydantic AI
Score	90.5	86.5
Rank in list	#2 of 12	#4 of 12
Price	Free and open sourceMIT-licensed library is free; LangSmith hosting is a separate paid service	Free and open sourceMIT-licensed and free; the optional Pydantic Logfire tracing service has a free tier
Free to use	Yes	Yes
Open source	Yes	Yes
Platforms	Self-hostedSelf-hosted	WindowsmacOSLinuxWindows, macOS, Linux
Made by	LangChain	Pydantic
Language	Python	Python
Agent approach	Graph of steps with state	Typed agents and structured outputs
Paid hosted service	LangSmith paid plans	Logfire, free tier
Best for	Stateful agents that need explicit control of each step	Typed Python agents for Pydantic users
Strengths	MIT-licensed library with durable execution Explicit state graphs for controlling each step Human-in-the-loop pauses built in	Typed Python across agents and tools MIT licensed with source on GitHub Uses OpenTelemetry for tracing
Limits	Lower-level than most frameworks, so simple agents need more code Tracing and deployment need the paid LangSmith service	Trace viewing is easiest with Pydantic Logfire, a separate service Best suited to developers who already use Pydantic
Links	Visit site	Visit site

Questions about LangGraph vs Pydantic AI

Is LangGraph better than Pydantic AI?: LangGraph ranks higher in our list of AI agent frameworks and tooling (#2 against #4, score 90.5 against 86.5). LangGraph is best for: stateful agents that need explicit control of each step. Pydantic AI is best for: typed Python agents for Pydantic users.
Which is cheaper, LangGraph or Pydantic AI?: LangGraph: MIT-licensed library is free; LangSmith hosting is a separate paid service. Pydantic AI: MIT-licensed and free; the optional Pydantic Logfire tracing service has a free tier.
Do LangGraph and Pydantic AI run on the same platforms?: LangGraph supports Self-hosted. Pydantic AI supports Windows, macOS, Linux.