Anthropic Builds Scion Version Control as Git Hits Its Limits
Anthropic is not shipping Scion as a Git competitor but treating its own infrastructure pain as an early signal that AI-generated code volume breaks tooling built around full client-side copies, and it says it wants to fold what worked back into Git.
Reporting from 1 source: GIGAZINE.
Anthropic has developed Scion, a version control system meant to replace Git, and has already moved its internal monorepo onto it. The company says AI coding made merge volume the bottleneck: its monorepo ran more than 30,000 merges a day as of September 2026, with roughly 25 million checkouts daily and more than 600 PB of Git traffic. Scion shifts computation to the server.
Scion does not keep a full copy on each client and moves commit and merge computation to the server. Anthropic reports faster operations than Git on its own codebase: pulling the latest state is 25 times faster, status is 207 times faster, and creating a new worktree is 84 times faster.
Development started by hand, then shifted once Claude Mythos Preview and Claude Tag were available internally. Anthropic says an early test version of Claude Mythos Preview, told to rewrite the whole Scion pipeline, cut memory use to one twentieth and raised processing speed fourfold. A companion code review system, Antique, was built alongside it.
Synthesized by Yomimono from the 1 cited source below, including Japanese-language reporting where cited, then editorially reviewed before publishing.