Claude Writes 90% of Its Own Code. Here's How Anthropic Builds Software Now

Claude writes about 90% of the code on Anthropic's Claude Code team, and across the whole company merges went from about 2,500 a day in May to over 30,000 by September. That broke git. Here's what Anthropic built instead, how they review code nobody typed, and what their engineers actually do all day now. The two posts this video is based on: Redesigning source control at Anthropic (Anthropic engineering, 13 Oct 2026) https://www.anthropic.com/engineering... How the Claude Code team does code review (claude.dev, 15 Oct 2026) https://claude.dev/blog/solving-code-... And the @ClaudeDevs post with the 90% line: https://x.com/ClaudeDevs/status/21111... The free six-layer checklist, the whole review stack from the video in one page you can copy: https://www.superagnt.com/r/ellie-yt-... This video is sponsored by superagnt, the company I co-founded. We build agents that run business operations on the same pattern: agents do the work, other agents check it, and people only see what's risky. https://www.superagnt.com/r/ellie-yt-... Chapters 0:00 Claude writes 90% of its own code 0:57 The number 2:02 Why git broke 4:25 How they review code nobody typed 6:41 What the humans do now 7:29 3 things you can copy Which of the three would you copy first? Tell me in the comments.