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Anthropic

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Eval Frameworks & Benchmarks (1)Reasoning & Chain-of-Thought (1)Red-Teaming & Adversarial Robustness (1)

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Chen Yueh-Han (1)Robert McCarthy (1)Bruce W. Lee (1)Ian Kivlichan (1)

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Mar 5, 2026

Anthropic1w ago·also Google Research

Reasoning Models Struggle to Control their Chains of Thought

Reasoning models are surprisingly bad at controlling their own thoughts: Claude Sonnet 4.5 can control its chain-of-thought only 2.7% of the time, raising questions about the reliability of CoT monitoring.

Chen Yueh-Han, Robert McCarthy, Bruce W. Lee +5

Eval Frameworks & Benchmarks Reasoning & Chain-of-Thought Red-Teaming & Adversarial Robustness

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