METR’s August 2025 study separates complete faithfulness from a narrower monitoring question: can a reasoning trace reveal that a model used extra information? Its DAFT setup uses free-response tasks and supplied clues to reduce the chance that a correct answer came from guessing, then tests detection from the trace. Reasoning could remain informative even when it did not explicitly acknowledge the clue. The authors flag imperfect ground truth, distribution differences between task conditions, and limited adversarial optimization; these experiments do not establish reliable detection of naturally occurring deception.
METR tests whether imperfect reasoning traces can still reveal hidden clues
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