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Best framework for building AI agents

3 models · updated 2026-06-29

The verdict

LangGraph leads — All 3 models rank LangGraph the top startup.

Combined ranking

  1. 1
    LangGraph—15 pts
    GPT #1Claude #1Gemini #1· Most mature orchestration for stateful production agents.
  2. 2
    CrewAI—8 pts
    GPT #5Claude #3Gemini #2· Role-based orchestration optimized for collaborating multi-agent teams.
  3. 3
    PydanticAI—2 pts
    GPT —Claude —Gemini #4· Type-safe, developer-first framework focused on validation and structured outputs.
  4. 4
    LlamaIndex—1 pts
    GPT —Claude #5Gemini —· Best-in-class data/RAG grounding now extended into capable agent workflows.
  5. 5
    Mastra—1 pts
    GPT —Claude —Gemini #5· Lightweight TypeScript framework for building and deploying backend agent workflows.

Not ranked (incumbents): OpenAI Agents SDK, AutoGen, Google Agent Development Kit

By model

ChatGPT

  1. 1.LangGraph
  2. 2.OpenAI Agents SDK
  3. 3.Google Agent Development Kit
  4. 4.AutoGen
  5. 5.CrewAI

Claude

  1. 1.LangGraph
  2. 2.OpenAI Agents SDK
  3. 3.CrewAI
  4. 4.AutoGen
  5. 5.LlamaIndex

Gemini

  1. 1.LangGraph
  2. 2.CrewAI
  3. 3.AutoGen
  4. 4.PydanticAI
  5. 5.Mastra

Tracked by ModelsAgree · rank 1 = 5 pts … rank 5 = 1 pt · re-polled continuously