Architecture Digest

Oct 1, 2026 · Artificial Intelligence

PageIndex: Vectorless RAG Hits 98.7% on FinanceBench via Tree Reasoning

PageIndex replaces vector databases with hierarchical tree indexes and LLM reasoning for retrieval, achieving 98.7% accuracy on FinanceBench versus 50% for vector RAG, with indexing cost of $0.001 per page and traceable page-level citations.