Head-to-head
LangChain vs LlamaIndex
LlamaIndex leads: the AI models rank it above its rival on 1 of the 1 leaderboard they share. Based on how ChatGPT, Claude, Gemini & Grok rank both across the leaderboard they share — re-polled on demand, reasoning shown verbatim.
| Leaderboard | LangChain | LlamaIndex |
|---|---|---|
| Best RAG framework | #3 / 9 | #1 / 9 |
Why the models rank LangChain — on best rag framework
“Largest integration ecosystem and LangGraph stateful orchestration make it the practical choice when retrieval must compose with tools, multi-step reasoning, and agents; still the fastest path for teams already in its orbit”
Why the models rank LlamaIndex — on best rag framework
“Best RAG-first toolkit for a Python team: deep ingestion, indexing, retrieval, reranking, structured-data and graph options, evaluation, workflows, and 300-plus integrations. Near-tied with Haystack, but faster for heterogeneous private data.”
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Ranks from the merged 4-model leaderboards · re-polled on demand · methodology