When AI Builds Itself
80 percent of Anthropic’s merged code written by Claude; engineers shipping roughly 8x more code per quarter, comparing 2021 to 2025.
Cited in
Favaro, Marina, and Jack Clark. 'When AI Builds Itself.' Anthropic Institute, 4 June 2026. www.anthropic.com/institute/recursive-self-improvement. (80 percent of Anthropic's merged code written by Claude; engineers shipping roughly 8x more code per quarter, comparing 2021 to 2025.