Anthropic: from around 2,500 merged code changes a day in May to more than 30,000 in September
Anthropic @AnthropicAIXImportance: major (4 of 5)
Why it matters
First-hand numbers from a frontier lab on agent-scale code output, and the announcement of its move from git to an in-house system.
Summary
Announces the engineering post “Redesigning source control at Anthropic”: merged changes grew from about 2,500 a day (May 2026) to more than 30,000 (September), and the monorepo was moved from git to a new in-house system in five months.
Archived text
New on our Engineering blog: Creating in-house source control.
In May, we merged around 2,500 code changes per day. In September, we merged more than 30,000 per day. As a result, we became bottlenecked by developer infrastructure built for human (rather than agent) scale.
Here, we share how we built a new version control system—and fully migrated our monorepo from git—in five months: https://www.anthropic.com/engineering/redesigning-source-control