Y Combinator’s CEO says he ships 37,000 lines of AI code per day. A developer looked under the hood

We love a good old social media roast, and Y Combinator CEO Garry Tan found himself on the business end of a doozie Wednesday.  Tan, who in a past life worked as an engineering manager at Palantir and has more recently been a vocal proponent for AI acceleration, bragged that he and his AI coding agents have been deploying 37,000 lines of code per day across five separate projects. “Absolutely insane week for agentic engineering,” Tan wrote in an X post on Monday, adding in a follow-up post that he was on a 72-day shipping streak. Absolutely insane week for agentic engineering37K LOC per day across 5 projectsStill speeding up pic.twitter.com/VR3utsduYx— Garry Tan (@garrytan) March 30, 2026 Two days later, a Polish game developer and senior software engineer who goes by the username Gregorein decided to have a closer look at the actual results of all that shipping by taking a peek at Tan’s AI-focused blog. “Here’s what 78,400 lines of AI slop code actually looks like in