Anthropic's Daily Merges Soar Past 30,000, Forcing a Homegrown Git Replacement
Anthropic revealed in an engineering blog post that, with Claude autonomously writing code at scale, daily merges in its internal monorepo surged from roughly 2,500 in May 2026 to over 30,000 by September—a roughly 12x increase in four months, with a single-day record of 30,401 merges on September 9. Git, designed for humans, had become the biggest bottleneck, so the team spent about five months building an in-house version control system called Scion (CLI: scn) to replace it.
Confirmed
- Data comes from Anthropic's official engineering blog: January–September 2026 charts show average daily merges growing from hundreds at the start of the year to tens of thousands, with only a brief one-week dip in August and 30,401 changes merged on September 9 alone.
- Scion's performance numbers: in developer environments, status dropped from 3.9s to 19ms (about 207x faster), and pull latest is about 25x faster.
- Anthropic says Claude can now autonomously iterate research loops, micro-optimize complex programs, and build new services from scratch, at unprecedented speed and scale.
Why it matters
- This shift directly illustrates the strain that autonomous AI coding agents place on traditional development infrastructure: with merges growing by an order of magnitude, git—built for human workflows—can't keep up, forcing an infrastructure rebuild.
- Scion's performance gains mean version control no longer has to be a bottleneck under high-frequency AI commits, offering a useful reference for other teams adopting AI coding at scale.
2026-10-13 ~ 2026-10-14 · 7 related posts
Primary sources
- Anthropic merges 30,000+ code changes a day, built in-house git replacement Scion in 5 months — AnthropicAI ·
- Anthropic built Scion, a new source control system, as AI-written code overwhelmed Git — mark_k ·
- Anthropic built its own git as monorepo PRs exploded — up to 207x faster, saves ~11,000 agent hours daily — scaling01 ·
- Anthropic's Monorepo Peaks at 30,401 Merges a Day, Prompting a Custom Git Build — scaling01 · 2026-10-13
- [source] Anthropic built its own git as monorepo PRs exploded — up to 207x faster, saves ~11,000 agent hours daily — scaling01 · 2026-10-13
- Anthropic's daily code merges up 10x since May, peaking at 30,401 in a day — inductionheads · 2026-10-14
- [source] Anthropic merges 30,000+ code changes a day, built in-house git replacement Scion in 5 months — AnthropicAI · 2026-10-14
- Anthropic now merges 30,000+ code changes daily, a 12x jump in 4 months — Yuchenj_UW · 2026-10-14
- [source] Anthropic built Scion, a new source control system, as AI-written code overwhelmed Git — mark_k · 2026-10-14
1 near-duplicate retellings: Yuchenj_UW