600K Lines, 60 Days: The Method Is Now Open Source
A powerful open-source toolkit for Claude Code that doubles QA capacity, syncs documentation, and enables seamless AI-agent collaboration with browser handoff and dual-AI review.
“AI Disruption” Publication 9200 Subscriptions 20% Discount Offer Link.
Y Combinator’s President and CEO, Garry Tan, recently did something remarkable.
Over the past 60 days, he wrote more than 600,000 lines of production code, with 35% being test code. He accomplished this as part of his daily work while fully handling all his CEO responsibilities.
His development stats from the last 7 days: Across three projects, he added a total of 147,751 lines of code, made 362 commits, and achieved a net increase of about 115,000 lines. His daily usable code output ranges from 10,000 to 20,000 lines.
He has packaged this methodology into an open-source tool called gstack.
From 772 to 1237
In 2013, when Garry Tan was building the internal YC social network Bookface, his total code contributions for the entire year were 772.
In 2026, just a few months in (March), his contribution count has already reached 1237—and it’s still growing.
The same person, different eras—the difference comes from the tools.
