Anthropic says Claude writes 80% of its own code and the world needs a plan to hit the brakes
TL;DR
Anthropic reveals that Claude now writes over 80% of its production code, with engineers shipping 8x more code per quarter than in 2024. The company’s new Anthropic Institute paper maps the path to recursive self-improvement and calls for a verifiable global pause mechanism.
One of Anthropic’s engineers hasn’t written a line of code in five months. Not because the work dried up, but because Claude does it now. As of May 2026, more than 80% of the code merged into Anthropic’s production codebase was authored by Claude, up from low single digits when Claude Code launched in February 2025.
That figure, published Wednesday in a new Anthropic Institute paper titled “When AI builds itself,” is not the headline the company wants you to focus on. The headline is what comes next: AI that can design and train its own successor. Anthropic says it isn’t there yet, but it...
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