✓ Use when
Developers building question-answering systems over enterprise documents, databases, or APIs. The go-to for production RAG pipelines.
✗ Avoid when
Simple single-document Q&A — a direct Claude or GPT API call with the document in context is simpler.
What is LlamaIndex?
LlamaIndex (formerly GPT Index) is the leading framework for connecting LLMs to your proprietary data. Ingest PDFs, databases, APIs, and more — then build chatbots, agents, and search tools that answer questions from your data. Complementary to LangChain with a stronger focus on data ingestion and retrieval.
Key features
✓160+ data connectors
✓Advanced RAG strategies (HyDE, re-ranking)
✓Agentic workflows with tool use
✓Multi-modal (text + image) support
✓LlamaCloud managed ingestion pipeline
Integrations
OpenAIAnthropicPineconeWeaviate
Third-party ratings
GitHub
4.7· 14,000 reviews
💰 Real-world pricing
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