Anthropic Replaces Git with Scion to Handle 30,000 Daily Merges from AI Agents

·2026.10.21 15:48

Key point

A 7-person team built Scion in 5 months to replace Git after Claude agents saturated infrastructure with 600+ PB/day of traffic.

Anthropic's internal monorepo merge velocity increased from 2,500 to over 30,000 merges per day between May and September 2026 due to autonomous Claude coding agents.
Naive Git traffic reached over 600 PB/day, saturating CPU and RAM on internal mirrors due to decentralized synchronization lag and packfile delta recomputation.
A 7-person engineering team developed Scion over 5 months to replace Git, using Claude Mythos Preview for optimization.
The system addresses the specific load of a ~100 GB main branch history and 25,000,000 daily CI checkouts.

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