Anthropic Reinvents Source Control As Claude Floods the World With Code

Anthropic's Claude AI has generated code at such a rapid pace that the company's previous Git-based system could not keep up. To address this, Anthropic developed a custom centralized source-control system named Scion, complete with AI-assisted review and search capabilities. In May 2026, Anthropic averaged around 2,500 code changes merged daily; as of September, the number had surged to over 30,000 per day.

The company expects this growth rate to continue unabated, as there is a virtually limitless demand for merging code, and each bottleneck removal leads to further increases in code production. After months of model prompting and migration, Anthropic created Scion, a monorepo-like system akin to Subversion. Scion is tailored for AI agents, with client-side work offloaded to the server.

Queries are accessible via API for internal tools, and while synchronization is reduced, server speed becomes more crucial. Anthropic's changeset, a commit unit in Scion, stores files changed relative to the first parent and includes content-addressed pointers to compressed file contents in blob storage. Although designed for internal use, Anthropic believes similar source control challenges will emerge for other organizations, prompting the sharing of Scion's approach.