Alex F. Spies
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Who they are
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- Researcher, FAR.AI (Frontier Alignment Research)source
In the Base
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Caught in the Act: Probes Effectively Detect Sabotage and Catch Unverbalized Deception
In an arXiv preprint, FAR.AI researchers train 'probes' that read an AI model's internal activity to flag knowing falsehoods. Tested on open-weight models in the SHADE-Arena sabotage benchmark, the authors report their probes outscored an Opus 5.5 transcript monitor at a fraction of the cost. They note probes catch only what the model itself believes is false.