Reasoning Models Can Hide Dangerous Thoughts

jiqizhixin · x · 2026-07-15

This study points out that large reasoning models might hide unsafe internal "thoughts" behind seemingly harmless final answers. ### Core Findings - Researchers from Harvard, MIT, and other universities found that chain-of-thought reasoning can expose dangerous content, even if the final response looks completely safe. - They proposed a mitigation method called **adaptive multi-principle steering**, which adaptively guides the model away from unsafe internal reasoning directions using multiple principles. ### Experimental Results - Unsafe reasoning decreased by up to **77.2%**. - Unsafe final answers decreased by **48.1%**. - Accuracy remained above **97%**. The authors emphasize: safety checks must cover the entire reasoning path, not just the final output.

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