Claude Now Writes 80% of Its Own Code — Anthropic's Self-Improvement Milestone Arrives Faster Than Expected
TL;DR: In a report published June 4, Anthropic disclosed that over 80% of code merged into its production codebase in May 2026 was written by Claude, not human engineers. Average engineer output has jumped 8× per quarter compared to the 2021–2025 baseline. Claude's success rate on complex, open-ended coding tasks hit 76% — up 50 percentage points in six months. The company's Mythos Preview model achieved a 52× speedup on AI training code optimization, a task where skilled humans typically reach...
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