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Introducing PageIndex File System: the vectorless retrieval engine now scales to millions of documents in a single index.

We built what Andrej Karpathy described, and solved the hard part. OpenKB is an open-source CLI that compiles raw documents into a structured, interlinked wiki, powered by PageIndex for long PDFs.

PageIndex has been selected for GitHub's Secure Open Source Fund, supporting a broader security roadmap for long-document AI infrastructure.

How PageIndex’s vectorless, reasoning-based RAG overcomes the challenges of traditional vector RAG in long, complex technical manuals.

We benchmarked PageIndex Chat against ChatGPT 5.1 on real-world long documents. PageIndex achieved 100% accuracy compared to ChatGPT 5.1's 59-82%, with faster response times and page-level traceability.