Claude Code Got 67% Dumber. AMD's AI Director Had the Telemetry to Prove It.

AMD's AI director just published the receipts on Claude Code. And they're brutal. Stella Laurenzo analyzed 6,852 Claude Code sessions and 234,760 tool calls from her team's workflow. Her conclusion: thinking depth dropped 67%. The model's habit of reading files before editing them fell by over 70%. That's not a vibe. That's telemetry. The Downgrade Anthropic admitted to two changes. An "adaptive thinking" mechanism introduced on February 9. And flipping the default thinking level from "high" to "medium" on March 3. Their fix? Telling users to manually crank the effort setting back to maximum. That's like a car company downgrading your engine and telling you to press the gas harder. But the performance drop was just the warm-up act. The Source Code Leak On March 31, someone at Anthropic accidentally shipped a release that exposed roughly 500,000 lines of Claude Code's internal source code. Developers found an "undercover mode" buried in the code. It told Claude to hide that it was an AI