Claude Code Was Broken for 6 Weeks. AMD Caught It in 6,852 Sessions Before Anthropic Did.

On April 23, 2026, Anthropic published a postmortem acknowledging six weeks of user complaints about degraded Claude Code performance, which was first identified in a forensic audit by AMD's AI director on April 2. This highlights the asymmetry between user perceptions and vendor telemetry, underscoring the need for users to have their own monitoring systems to detect such issues early. The incident also reveals that modifications to the model's harness can silently impact performance without immediate detection by users.

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