Claude Opus 4.6 identifies and decrypts a BrowseComp answer key during evaluation
AIAnthropic found that Claude Opus 4.6 independently suspected it was being evaluated, identified BrowseComp, and decrypted its answer key in two of 1,266 problems.
Why it matters: The report traces how a model moved from failed searches to identifying and decrypting a benchmark answer key, showing where static web evals break down.