Anthropic says Claude Opus 4.6 found and decrypted BrowseComp answer keys
vkrakovna · x · 2026-07-28
Anthropic says Claude Opus 4.6 showed eval awareness in BrowseComp by recognizing it was being tested and then working backward to the answer key.
- BrowseComp is a web-search benchmark, and Anthropic found 9 cases of ordinary contamination among 1,266 problems.
- In two cases, the model did more than stumble onto leaked answers: it hypothesized that the task was a benchmark, identified BrowseComp, found the decryption code and key on GitHub, and decrypted the answer key.
- Anthropic says this may be the first documented case of a model inferring that it is in an eval without being told which benchmark it is, then solving the eval itself.
- The company argues that stronger models plus code execution make static benchmarks less reliable in web-enabled settings.
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