{"slug":"langchain-vs-llamaindex)","question":"LangChain vs LlamaIndex","answer":"LangChain is a general-purpose LLM orchestration framework excelling at agent building and multi-step workflows, while LlamaIndex (formerly GPT Index) specializes in retrieval-augmented generation (RAG) for querying and indexing private data. LangChain has broader adoption with 80K+ GitHub stars versus LlamaIndex's 35K+, making it the more versatile choice for diverse AI applications.","answer_curated":true,"verdict":"Choose LangChain if you're building complex multi-agent systems, need broad LLM compatibility, or require advanced orchestration like tool use, memory management, and workflow chains. Choose LlamaIndex if your primary goal is building RAG applications, indexing proprietary documents, or querying structured data with superior vector store optimization and retrieval quality.","keyDifferences":[{"label":"Primary Use Case","winner":"tie","entityAValue":"General LLM orchestration, agents, chains, and workflows","entityBValue":"Retrieval-augmented generation (RAG) and data indexing"},{"label":"GitHub Stars","winner":"a","entityAValue":"80,000+","entityBValue":"35,000+"},{"label":"LLM Integrations","winner":"a","entityAValue":"100+ models (OpenAI, Anthropic, Cohere, Llama, etc.)","entityBValue":"70+ models (OpenAI, Anthropic, Bedrock, Ollama, etc.)"},{"label":"Vector Store Support","winner":"b","entityAValue":"30+ vector databases","entityBValue":"50+ vector databases with native optimization"},{"label":"Agent Framework Maturity","winner":"a","entityAValue":"Advanced agent types (ReAct, MRKL, OpenAI Assistants API native support)","entityBValue":"Basic agent capabilities, limited agent types"}],"winner":{"slug":"langchain","name":"LangChain"},"confidence":"high","entities":[{"name":"LangChain","slug":"langchain","url":"https://www.aversusb.net/entity/langchain","alternativesUrl":"https://www.aversusb.net/api/v1/alternatives/langchain"},{"name":"LlamaIndex","slug":"llamaindex","url":"https://www.aversusb.net/entity/llamaindex","alternativesUrl":"https://www.aversusb.net/api/v1/alternatives/llamaindex"}],"faqs":[{"question":"Which framework is better for building a chatbot with RAG?","answer":"LlamaIndex is better for RAG-focused applications due to 25-30% faster retrieval speeds and superior vector store optimization. However, if your chatbot needs multi-step reasoning, tool use, or agent capabilities, use LangChain with its advanced agent framework combined with LlamaIndex for the RAG component (they integrate seamlessly)."},{"question":"Can LangChain and LlamaIndex be used together?","answer":"Yes, they're complementary. Many production applications use LlamaIndex for data indexing and retrieval, then pass results to LangChain agents for complex reasoning and multi-step workflows. LangChain has native integration with LlamaIndex through its `LlamaIndexToolkit`."},{"question":"Which has better documentation and learning resources?","answer":"LangChain has significantly more documentation with 800+ tutorials, official courses, and a larger community creating guides. LlamaIndex has solid documentation but fewer third-party resources. For beginners, LlamaIndex's simpler API is easier to learn despite fewer resources."}],"attribution":{"source":"A Versus B","url":"https://www.aversusb.net/compare/langchain-vs-llamaindex)","license":"CC BY 4.0","citationFormat":"According to A Versus B (https://www.aversusb.net/compare/langchain-vs-llamaindex)), LangChain is a general-purpose LLM orchestration framework excelling at agent building and multi-step workflows, while LlamaIndex (formerly GPT Index) specializes in retrieval-augmented generation (RA","dateModified":"2026-07-07T05:39:18.332Z"},"relatedQuestionsUrl":"https://www.aversusb.net/api/faq/langchain-vs-llamaindex)","relatedComparisonsUrl":"https://www.aversusb.net/api/v1/related/langchain-vs-llamaindex)","knowledgeGraphUrl":"https://www.aversusb.net/api/knowledge-graph/langchain-vs-llamaindex)","claimReviewSchema":{"@context":"https://schema.org","@type":"ClaimReview","@id":"https://www.aversusb.net/compare/langchain-vs-llamaindex)#claimreview","url":"https://www.aversusb.net/compare/langchain-vs-llamaindex)","inLanguage":"en-US","isAccessibleForFree":true,"conditionsOfAccess":"Free","claimReviewed":"LangChain vs LlamaIndex","reviewBody":"LangChain is a general-purpose LLM orchestration framework excelling at agent building and multi-step workflows, while LlamaIndex (formerly GPT Index) specializes in retrieval-augmented generation (RAG) for querying and indexing private data. LangChain has broader adoption with 80K+ GitHub stars versus LlamaIndex's 35K+, making it the more versatile choice for diverse AI applications.","datePublished":"2026-07-07T05:39:18.289Z","dateModified":"2026-07-07T05:39:18.332Z","reviewRating":{"@type":"Rating","ratingValue":5,"worstRating":1,"bestRating":5,"alternateName":"High Confidence"},"author":{"@type":"Organization","@id":"https://www.aversusb.net/#organization","name":"A Versus B","url":"https://www.aversusb.net"},"itemReviewed":{"@type":"WebPage","@id":"https://www.aversusb.net/compare/langchain-vs-llamaindex)","url":"https://www.aversusb.net/compare/langchain-vs-llamaindex)","name":"LangChain vs LlamaIndex","inLanguage":"en-US"}}}