AGT

Best Agent-building frameworks & harnesses

6 tools, compared by pricing model and who each one suits. Scores are coming soon. Tools stay unscored until we've tested them hands-on. How we rank →

Agent-building frameworks & harnesses · ranked6 shown
#ToolScore
  1. #1LangGraph logo
    LangGraph

    Graph-based framework for stateful agents

    Agent-building frameworks & harnesses·OSS free; paid platform·Price: see site
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  2. #2CrewAI logo
    CrewAI

    Multi-agent "crew" orchestration framework

    Agent-building frameworks & harnesses·OSS free; paid cloud·Price: see site
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  3. #3AG2 (AutoGen) logo
    AG2 (AutoGen)

    Open-source multi-agent conversation framework

    Agent-building frameworks & harnesses·Free, open source·Price: see site
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  4. #4OpenAI Agents SDK logo
    OpenAI Agents SDK

    Lightweight SDK for agents, handoffs and guardrails

    Agent-building frameworks & harnesses·Free SDK; model usage billed·Price: see site
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  5. #5Mastra logo
    Mastra

    TypeScript agent framework

    Agent-building frameworks & harnesses·OSS free; cloud·Price: see site
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  6. #6Pydantic AI logo
    Pydantic AI

    Type-safe Python agent framework

    Agent-building frameworks & harnesses·Free, open source·Price: see site
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AI coding agents & IDEsMCP & context-engineering toolsVibe-coding app buildersAI writingAI research & searchImage, video & voice generationAutomation & agent workflows