Best Agent frameworks & SDKs AI Tools

These are the best agent frameworks & sdks AI tools for builders, ordered by their positions in StackRank's task rankings. LangGraph leads right now. Each listing shows its pricing model, category and last-verified date, and payments never change the order. Filter by pricing, or read how we rank.

Updated Oct 14, 2026 · How we rank

Ranked, not sold.

1. #1

   L

   #1

   LangGraph

   Library for building stateful, multi-actor agent graphs.

   Agent frameworks & SDKsopen-source

   #1 in Best for multi-agent orchestration · Score: not yet benchmarked

   Visit LangGraphDetails
2. #2

   OA

   OpenAI Agents SDK

   Lightweight framework for multi-agent workflows from OpenAI.

   Agent frameworks & SDKsopen-source

   #1 in Best framework for your first agent · Score: not yet benchmarked

   Visit OpenAI Agents SDKDetails
3. #3

   C

   CrewAI

   Python framework for orchestrating role-playing multi-agent crews.

   Agent frameworks & SDKsopen-source

   #2 in Best for multi-agent orchestration · Score: not yet benchmarked

   Visit CrewAIDetails
4. #4

   VA

   Vercel AI SDK

   TypeScript toolkit for building AI apps and agents.

   Agent frameworks & SDKsopen-source

   #2 in Best framework for your first agent · Score: not yet benchmarked

   Visit Vercel AI SDKDetails
5. #5

   A

   AutoGen

   Microsoft's framework for multi-agent AI applications.

   Agent frameworks & SDKsopen-source

   #3 in Best for multi-agent orchestration · Score: not yet benchmarked

   Visit AutoGenDetails

6. #6

   PA

   Pydantic AI

   Python agent framework from the Pydantic team.

   Agent frameworks & SDKsopen-source

   #3 in Best framework for your first agent · Score: not yet benchmarked

   Visit Pydantic AIDetails
7. #7

   M

   Mastra

   TypeScript framework for AI agents and workflows.

   Agent frameworks & SDKsopen-source

   #4 in Best framework for your first agent · Score: not yet benchmarked

   Visit MastraDetails

Task rankings in Agent frameworks & SDKs

• Best framework for your first agent
• Best for multi-agent orchestration

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