Open Source RAG Framework Comparison 2026: LangChain vs LlamaIndex vs Haystack

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🩺 Summary

Choosing a RAG framework is critical. Here is the real comparison.

📝 Details

LangChain (98K, 500 integrations), LlamaIndex (38K, RAG-first), Haystack (18K, production). LangChain for chains, LlamaIndex for RAG.