Redesigning source control at Anthropic

Summary

Anthropic describes building Scion, its own centralized source control system, to replace Git after its merge rate rose from about 2,500 changes per day in May 2026 to over 30,000 per day by September. The main branch history is almost 100 GB, and the company performs about 25 million CI checkouts per day. A seven-person team completed the migration from Git in five months.

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