6,852 Sessions Don't Lie: How Developers Caught Claude's Regression Before Anthropic Did
In April 2026, Claude Code got measurably worse. Developers noticed within hours. Anthropic confirmed it within days. Here's the full story — and what it means for teams that depend on AI coding tools.
Anthropic shipped Opus 4.7 on April 18, 2026. Within 24 hours, developers were calling it 'legendarily bad.' One engineer analysed 6,852 Claude Code sessions and proved the regression with data. Anthropic confirmed three specific issues and rolled back in 48 hours. The benchmarks never caught it.