Anthropic’s Scion Replaces Git as Merges Exceed 30,000 a Day
Built from 3 signals across 2 sources · 232 items reviewed
Anthropic’s code-production rate outgrew the assumptions built into its source-control, build and CI systems. After daily monorepo merges rose from about 2,500 in May 2026 to more than 30,000 in September, the company built Scion and migrated off Git in five months. The change shows that at sufficiently high change volume, developer infrastructure—not code generation—becomes the limiting system.
- Anthropic averaged around 2,500 merged code changes per day in May 2026 and exceeded 30,000 per day by September.
- The company built Scion, an in-house version control system, and fully migrated its monorepo from Git in five months.
- Anthropic identified source control, builds and CI as its main bottlenecks as Claude autonomously iterated on research, optimized programs and built services.
- A January–September 2026 view of Anthropic’s monorepo shows weekday merge volume rising from roughly 1,000 per day in January to more than 10,000 by mid-August, before exceeding 30,000 per day in September.
Bottom line If your repository’s change rate is accelerating, measure source-control, build and CI throughput now rather than assuming Git-era workflows will scale with it.
Signals3
- Redesigning source control at Anthropic
- Featured Redesigning source control at Anthropic As our merges per day grew more than tenfold, source control became our biggest development bottleneck. Here, we share how we migrated to an in-house version control system in five months.
- Redesigning source control at Anthropic
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