Did Anthropic Kill Git?

This week a lot of people on X said Anthropic killed git. Here's what actually happened. Anthropic went from about 2,500 merged changes a day in May to over 30,000 a day in September, mostly because of how much code Claude writes. Their monorepo's main branch history is almost 100 GB, and CI checks it out about 25 million times a day. Git's "every clone is a full copy" design stopped fitting, so a team of seven built Scion, an in-house source control system where the server does the work, and moved the monorepo over in five months. In this video: why git struggled at Anthropic's scale, how Scion works, the speed numbers Anthropic published (their own measurements), what Hacker News and X thought, and why your git setup doesn't change. Anthropic says Scion is not a general replacement for git, it isn't open source, and they don't plan to release it. Sources: - Anthropic Engineering, "Redesigning source control at Anthropic" (Oct 13, 2026): https://www.anthropic.com/engineering/redesigning-source-control - Anthropic on X: https://x.com/AnthropicAI/status/2110047081414987957 - Hacker News discussion: https://news.ycombinator.com/item?id=50073633 - Posts shown: https://x.com/DanielMiessler/status/2110111959811297632 · https://x.com/VaibhavSisinty/status/2110098334581170678 · https://x.com/dexhorthy/status/2110080282279719187 - Unofficial OpenScion (not made by Anthropic): https://github.com/tinyhumansai/openscion Charts and diagrams shown are from Anthropic's post. Other graphics are drawn for this video. ## Chapters 0:00 Did Anthropic kill git? 0:28 30,000 merges a day 0:58 A 100 GB repository 1:22 Why git didn't fit 1:49 How Scion works 2:28 The numbers 2:51 Seven people, five months 3:26 What developers said 3:58 The verdict 4:25 What happens next