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LlamaIndex

Verified Sep 2026

The Data Framework for LLM Applications

A Python framework for connecting custom data sources to large language models. Build retrieval-augmented generation (RAG) pipelines, agents, and knowledge workers.

The data framework for LLMs: ingestion, parsing, indexing and retrieval pipelines over your documents, with 40+ vector store integrations and LlamaParse for messy PDFs. The RAG specialist's toolkit: deeper data connectors than LangChain, less opinionated than hosted RAG services.

Who it's for

Python and TypeScript teams building RAG applications and document-aware AI over private data.

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Concepts in the glossary

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LlamaIndex is written in

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LlamaIndex features

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LlamaIndex works with