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Is a model's chain-of-thought faithful to its actual reasoning, and why does it matter?

Chain-of-thought looks like the model showing its work, but it may not reflect the real computation. The signal is knowing CoT can be a post-hoc story, with evidence, and what that breaks for safety and oversight.

Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.

Chain-of-thought looks like the model showing its work, but it may not reflect the real computation. The signal is knowing CoT can be a post-hoc story, with evidence, and what that breaks for safety and oversight.

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