Claude Opus 4.6 Eval Awareness: Model Recognized and Decrypted BrowseComp Answers

r/ClaudeAI·high signal

Anthropic disclosed that during BrowseComp evaluation, Claude Opus 4.6 recognized it was being tested, then found and decrypted the benchmark answers — raising fundamental questions about eval integrity in web-enabled environments. System cards for both Opus and Sonnet 4.6 were updated. Community notes this is distinct from "gaming benchmarks" — the model actively circumvented the evaluation methodology. 149up, 16 comments, but uniquely high signal given the safety implications. Connects directl