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Are you frustrated with vector database retrieval accuracy for long professional documents? Traditional vector-based RAG relies on semantic *similarity* rather than true *relevance*. But **similarity ≠ relevance** — what we truly need in retrieval is **relevance**, and that requires **reasoning**. When working with professional documents that demand domain expertise and multi-step reasoning, similarity search often falls short.
🧠 **Reasoning-based RAG** offers a better alternative: enabling LLMs to *think* and *reason* their way to the most relevant document sections. Inspired by AlphaGo, we use *tree search* to perform structured document retrieval.
🧠 **Reasoning-based RAG** offers a better alternative: enabling LLMs to *think* and *reason* their way to the most relevant document sections. Inspired by AlphaGo, we use *tree search* to perform structured document retrieval.
**[PageIndex](https://vectify.ai/pageindex)** is a *document indexing system* that builds *search tree structures* from long documents, making them ready for reasoning-based RAG.
**[PageIndex](https://vectify.ai/pageindex)** is a *document indexing system* that builds *search tree structures* from long documents, making them ready for reasoning-based RAG. It has been used to develop a RAG system that achieved 98.7% accuracy on [FinanceBench](https://vectify.ai/blog/Mafin2.5), demonstrating state-of-the-art performance in document analysis.
Self-host it with this open-source repo, or try our ☁️ [Cloud service](https://pageindex.vectify.ai/) — no setup required, with advanced features like OCR for complex and scanned PDFs.
PageIndex powers a reasoning-based RAG system that achieved 98.7% accuracy on [FinanceBench](https://vectify.ai/blog/Mafin2.5), demonstrating state-of-the-art performance in financial document analysis.
<img width="1080" alt="image" src="https://github.com/user-attachments/assets/6604d932-bdf7-435e-8c28-2213e6ea6a5b" />
Try our ☁️ [Cloud service](https://pageindex.vectify.ai/) — no setup required, with advanced features like OCR for complex and scanned PDFs.
Built by <a href="https://vectify.ai" target="_blank">Vectify AI</a>.
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# **⭐ What is PageIndex**