LlamaIndex is a data framework for connecting custom data sources to large language models (LLMs). The company’s framework offers an opensource toolkit with data connectors that ingest existing data sources (APIs, PDFs, docs, SQL, etc.), while also providing ways to structure that data (indices, graphs) with an advanced retrieval/query interface to layer on top. It enables LLM developers to quickly perform question-answering, summarization and insight extraction within an external environment. LlamaIndex was founded in 2022 by Jerry Liu and Simon Suo.