Checked fact 263824 Oct 2026Research

Anthropic describes a faithful Chain-of-Thought as a true description of exactly what the model was thinking as it reached its answer, and says there is no specific reason the reported Chain-of-Thought must accurately reflect the true reasoning process.

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The exact words it rests on

it would be faithful —it would be a true description of exactly what the model was thinking as it reached its answer. ... There’s no specific reason why the reported Chain-of-Thought must accurately reflect the true reasoning process

What the source said when we opened it, on 24 Oct 2026.

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Reasoning models don't always say what they think
Anthropic · 2025-04-03

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Checked

Checked by the notis newsroom on 24 Oct 2026, against the source above.

In the story

Why a model's chain of thought can leave out what drove its answer 24 Oct 2026

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“Anthropic describes a faithful Chain-of-Thought as a true description of exactly what the model was thinking as it reached its answer, and says there is no specific reason the reported Chain-of-Thought must accurately reflect the true reasoning process.” ai notis, checked 24 Oct 2026. Source: Reasoning models don't always say what they think (Anthropic). https://ainotis.com/c/2638

As a reference (APA style)

ai notis. (2026, October 24). Anthropic describes a faithful Chain-of-Thought as a true description of exactly what the model was thinking as it reached its answer, and says there is no specific reason the reported Chain-of-Thought must accurately reflect the true reasoning process [Checked claim 2638]. ai notis. https://ainotis.com/c/2638

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