Anthropic abandons Git for its own Scion version control system
Anthropic has stopped using Git and built an internal version control system called Scion. The move follows a sharp rise in code changes driven by AI agents such as Claude.
Key points
- Anthropic replaces Git with internal version control system Scion.
- Scion uses lazy fetching to pull only needed files for AI agents.
- Commit volume rose from 2,500 to over 30,000 per day between May and September 2026.
From May 2026 to September 2026, commit volume grew from approximately 2,500 commits per day to over 30,000 commits per day, and repository history sizes exceeded 100GB. Scion’s design focuses on lazy fetching, pulling only the files an AI agent needs, which keeps operations fast even as the monorepo grows.
The change signals a shift toward AI‑native development environments. While Scion is not for public use, the approach may influence how other companies structure their tooling for AI‑generated code and could prompt a rethink of Git‑centric workflows.
The story so far
2 episodes →- Anthropic abandons Git for its own Scion version control systemthis story
Version Control in the Era of AI-Generated Code: Exploring the Background of Anthropic's Move from Git to 'Scion'
note.com · 25 October 2026
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