Simple Features Beat Most AI Control Monitors

The paper demonstrates that simple feature-based methods outperform most AI control monitors on a standard evaluation dataset, without executing the code. These features exploit style differences between honest solutions written by humans and backdoored code produced by older language models, as well as distinct problem characteristics. The study also reveals that a significant portion of backdoors fail validity checks, and that a Sonnet 5 monitor detects fewer backdoors from its own model compared to older models, highlighting potential biases in current evaluation practices.

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