Anthropic CEO reveals engineers use Claude to generate over 80% of production code

Anthropic’s engineers have become editors more than writers. CEO Dario Amodei has disclosed that Claude, the company’s flagship AI model, now authors more than 80% of the code merged into Anthropic’s production codebase. Many of the company’s engineers no longer write significant code themselves. That figure was in the low single digits before the launch of Claude Code in February 2025. In roughly 15 months, the tool went from research preview to the backbone of how one of the world’s most prominent AI labs actually builds software. The numbers behind the shift The productivity gains are striking. Anthropic reports an 8x increase in code shipped per engineer per quarter compared to the baseline period from 2021 to 2025. Instead of spending hours writing functions, debugging edge cases, and optimizing performance, Anthropic’s developers now focus on high-level goals, system architecture, and oversight. Claude handles the grunt work: bug fixes, code optimization, and initial implementation, often autonomously. According to internal assessments, the quality of Claude-generated code is now reportedly on par with what human engineers produce. Anthropic expects AI-authored code to surpas...