Anthropic Quietly Nerfed Claude Opus by 73%

Anthropic made Opus dumber (73% Drop), Claude Code Hits $2.… · Apr 18, 2026 Technology

An AMD director analyzed 7,000 Claude Opus sessions and found a 73% drop in reasoning depth between January and March 2026. Anthropic didn't change the model — they throttled how much it thinks to save compute. Power users noticed.