LangChain alternatives

The short answer

5 tools on this index are recorded as a substitute for LangChain. 5 of these run the same way you already deploy LangChain (self-hosted), and 5 are permissively licensed, so they do not change what you can ship. All of them sit in Agent Frameworks, so the choice is a real one rather than a category change. There is no overall winner here: which one is right depends on traffic shape, operational budget and how much of LangChain you have already built around.

By Lattice editorial · Comparison reviewed 2026-09 · method

• LlamaIndexframework · MIT

  Data-centric framework for retrieval and agent workflows.

  Use when Data-centric work where retrieval is the centre of the problem.

  Skip when You need agent orchestration more than data access.

• Pydantic AIframework · MIT

  Type-safe agent framework that leans on Pydantic models.

  Use when Type-safe agents where schema correctness is the priority.

  Skip when You want a batteries-included ecosystem.

• AutoGenframework · MIT

  Microsoft research project for conversable multi-agent systems.

  Use when Research into conversable multi-agent systems.

  Skip when You need something stable and documented for production.

• CrewAIframework · MIT

  Role-based orchestration where agents collaborate as a crew.

  Use when Role-based orchestration where agents are framed as a team.

  Skip when You want direct control over the loop itself.

• Semantic Kernelframework · MIT

  Microsoft SDK for embedding AI steps into .NET and Python apps.

  Use when Embedding AI steps into an existing .NET estate.

  Skip when Your stack is not .NET.