Anthropic reports its merged code changes rose from roughly 2,500 per day in May 2026 to over 30,000 per day by September, prompting a custom replacement for Git called Scion. The system, built by a seven-person team, completed migration in five months; the main branch history is nearly 100 GB. Engineer Nick said offline support was skipped because Claude is Scion's heaviest user. The author speculates Fable/Mythos-class models drove the velocity increase.
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