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Andrej Karpathy Stopped Using AI to Write Code. He’s Using It to Build a Second Brain Instead
His new workflow turns raw research into a self-maintaining wiki.No vector databases, no RAG pipelines, just markdown files and an LLM that acts like a full-time librarian.
On April 3, 2026, Andrej Karpathy co-founder of OpenAI, former AI lead at Tesla, the guy who coined "vibe coding" posted something on X that stopped me mid-scroll.
He said he’s spending less time using AI to generate code and more time using it to organize knowledge. Not in some abstract, theoretical way. He described an actual working system where he dumps raw research materials into a folder, points an LLM at it, and the LLM builds and maintains an entire interlinked wiki from scratch. No human editing. The AI writes the articles, creates backlinks between related ideas, categorizes concepts, and keeps the whole thing updated as new material comes in.
His research wiki on a single topic has grown to about 100 articles and 400,000 words. He rarely touches it directly.
The tweet went massively viral. The next day, he followed up with what he called an "idea file" a GitHub gist laying out the full architecture, designed to be copied and pasted directly into an LLM agent so it can build the system for you.
