Anthropic went from 2,500 merges a day to 30,000 in four months, and git broke first.
"Coding is no longer the bottleneck," the post says.
The bottleneck is everything built for human-scale engineering: source control, builds, CI. The main branch history is about 100 GB, CI does roughly 25 million checkouts a day, and a naive git fetch of all that would be 600 PB of traffic daily. So a team of seven built Scion, an in-house version control system, plus a code review surface
called Antique, and finished the migration off git in five months. Why no offline mode? "Claude is by far the heaviest user of Scion and is necessarily online." That one line is the whole story: the primary user of the developer toolchain is no longer a developer. Simon Willison's read overlays model release dates on the merge chart.)