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The CEO of Y Combinator Gave Away The Brain His AI Agents Run On. Here Is How To Set It Up.

The free guide to Gbrain: what it is, why it beats an Obsidian second brain, and the exact commands to wire a real, permanent memory into Claude Code or Codex. Open source, runs on your machine, no enterprise plan.

  • Why your AI feels dumb, and the one thing it has never had: memory
  • The 3 layers of memory Gbrain gives you, in plain English
  • Why it beats a notes app: it answers you instead of handing you a pile of notes
  • The 2-command setup to wire it into Claude Code or Codex
  • How to point it at your existing Obsidian vault so years of notes start thinking

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What Gbrain is, why it beats an Obsidian second brain, and the exact commands to give your AI a real memory. The brain the CEO of Y Combinator runs his own agents on.

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A look inside

What's inside

01

What You'll Learn

Why your AI feels dumb, and the one thing it has never had: memory The 3 layers of memory Gbrain gives you, in plain English Why it beats a notes app: it answers you instead of handing you a pile of notes The 2-command setup to wire it into Claude Code or Codex How to point it at

02

What Gbrain Actually Is

Gbrain is a free, open-source memory layer for AI, built by Garry Tan, the President and CEO of Y Combinator.

03

Why It Beats A Notes App

An app like Obsidian is a filing cabinet.

About the author

Cooper Simson

Founder of Actionable AI. 30,000+ operators read the newsletter.

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No. The guide explains the work in practical steps and calls out technical details only when they matter.

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