Claude wrote 80% of Anthropic's code, CI tasks surged 25 times in half a year, nearly causing system breakdown
Internal data from Anthropic shows that Claude has written 80% of the company's code. Engineer quarterly delivery volume has increased to 8 times the average between 2021 and 2025, with Claude also taking on a large portion of code review and merging tasks. However, the AI coding model differs significantly: it prefers extremely granular PRs, submits code around the clock, and test cases have increased 10-fold, leading to a surge in CI workloads that caused the system to almost crash within six months.