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Best RAG framework

3 models · updated 2026-06-29

The verdict

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

Combined ranking

  1. 1
    LlamaIndex—14 pts
    GPT #1Claude #2Gemini #1· Best RAG-native framework for indexing, retrieval, agents, and production data connectors.
  2. 2
    Haystack—9 pts
    GPT #3Claude #3Gemini #3· Strong open-source pipelines for production search, hybrid retrieval, and reranking.
  3. 3
    RAGFlow—4 pts
    GPT #4Claude #4Gemini —· Practical document RAG platform with parsing, workflows, and enterprise-friendly UX.
  4. 4
    DSPy—2 pts
    GPT #5Claude —Gemini #5· Best for optimizing RAG prompts and pipelines with measurable quality loops.
  5. 5
    Dify—2 pts
    GPT —Claude —Gemini #4· Comprehensive LLM application development platform featuring a visual builder and built-in RAG engine.
  6. 6
    txtai—1 pts
    GPT —Claude #5Gemini —· Lightweight all-in-one embeddings database and RAG framework that's easy to self-host.

Not ranked (incumbents): LangChain

By model

ChatGPT

  1. 1.LlamaIndex
  2. 2.LangChain
  3. 3.Haystack
  4. 4.RAGFlow
  5. 5.DSPy

Claude

  1. 1.LangChain
  2. 2.LlamaIndex
  3. 3.Haystack
  4. 4.RAGFlow
  5. 5.txtai

Gemini

  1. 1.LlamaIndex
  2. 2.LangChain
  3. 3.Haystack
  4. 4.Dify
  5. 5.DSPy

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