Agent: Claude, CursorLLM: Claude 3 Opus, GPT-4#AI Agent Brain#Knowledge Synthesis#Vector RAG#Knowledge Graph#Institutional Memory
GBrain is an AI-powered knowledge synthesis engine built by Y Combinator's CEO Garry Tan for autonomous agents. It combines vector search, knowledge graphs, and LLM synthesis to turn raw information into actionable answers with citations. Originally built to power personal agents ingesting meetings, emails, and tweets, it now scales as a company brain with per-user access controls and zero-shot entity extraction.