YC CEO Garry Tan open-sources gbrain, the agent memory system behind his 155k-page brain
victor_explore · x · 2026-11-11
Y Combinator CEO Garry Tan open-sourced gbrain (MIT, 32.6k GitHub stars), the memory system his own agents run on. It stores explicit facts with sources, supports corrections and withdrawal, and shares one brain across agents — plugging into Claude Code, Codex and more over MCP. Start with keyless memory and keyword retrieval; add semantic search, synthesis and background enrichment as needed. Free to self-host, with optional paid hosting at gbrain.io. Tan's production instance holds 155,795 pages, 24,589 people and 5,340 companies, with 66 cron jobs running autonomously — ingesting meetings, emails, tweets and voice calls overnight while fixing its own citations.
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