GoKawiilAnthropic built in-house version control system Scion to replace git
Anthropic says daily code changes merged into its monorepo grew from about 2,500 in May to over 30,000 by September, driven largely by Claude writing and iterating on code autonomously. To handle that scale, the company built and fully migrated to a new version control system called Scion within five months, along with a code review tool, code search, and an access-management system.
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Anthropic frames this as evidence that AI-generated code is now outpacing developer tools designed for human-scale workflows like git, forcing it to build custom infrastructure rather than adapt existing systems. The company suggests other organizations adopting AI coding tools may soon hit similar bottlenecks in source control, builds, and CI, making this a possible early signal of broader infrastructure strain across the industry.
- Anthropic's daily merged code changes grew 12x, from ~2,500 to over 30,000 between May and September.
- The company built Scion, a new version control system, and migrated its entire monorepo from git in five months.
- Anthropic also shipped a new code review tool, code search, and an IAM system to support the scale increase.
Source: anthropic.com, 2026-10-13
Published there as: “Redesigning Source Control at Anthropic”
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