Anthropic rebuilds source control as AI pushes code merges from 2,500 to 30,000 daily
Simon Willison · rss · 2026-10-14
- Anthropic explains why it built Scion, a custom Git replacement: merged code changes grew from 2,500/day in May 2026 to 30,000+/day by September.
- Extreme requirements: main branch history 100 GB, compressed working copy 25+ GB, 25M CI checkouts/day — naive Git fetching would mean 600+ PB of traffic daily.
- Built by a 7-person team, migrated from Git in 5 months; a companion code review system is called Antique.
- Simon Willison guesses the Fable/Mythos model class drove the coding velocity spike, and notes Anthropic's adversarial review practice (models critiquing each other) is highly effective but myopic, needing senior engineers to steer Claude away from over-engineering.
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