On October 13, Anthropic said it had completed a five-month migration of its monorepo from Git to an in-house version control system called Scion, after AI-driven coding pushed source control into a bottleneck.
In its engineering post, the company says merged code changes climbed from about 2,500 per day in May 2026 to more than 30,000 per day by September 2026. Anthropic also says its CI systems now perform roughly 25 million code checkouts a day, making the old Git mirroring setup too costly to keep scaling.
Anthropic reports that Scion reduced source-control infrastructure CPU and memory usage by about 200x versus the previous setup, while CI capacity improved with CPU demand down 25%. The company is not positioning Scion as a general-purpose Git replacement or a public product.
For builders, the useful signal is the pressure that coding agents can put on standard repo and CI patterns. As merge volume and validation runs rise, clone-first workflows and tightly serialized merge queues can turn into infrastructure limits.