Checked fact 34222 Nov 2026Laws and rulings

The post says watermarking is a way of determining the likelihood that Claude was involved in writing the text, and that a detection API is in private preview for eligible organisations such as regulators, researchers and media groups.

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We are releasing a detection API in private preview.

What the source said when we opened it, on 2 Nov 2026.

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How Claude's text watermarking works
Anthropic · 2026-08-14

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Checked by the notis newsroom on 2 Nov 2026, against the source above.

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Anthropic's help page lists 16 Claude models back to Opus 4.5 as carrying its text watermark 2 Nov 2026

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“The post says watermarking is a way of determining the likelihood that Claude was involved in writing the text, and that a detection API is in private preview for eligible organisations such as regulators, researchers and media groups.” ai notis, checked 2 Nov 2026. Source: How Claude's text watermarking works (Anthropic). https://ainotis.com/c/3422

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ai notis. (2026, November 2). The post says watermarking is a way of determining the likelihood that Claude was involved in writing the text, and that a detection API is in private preview for eligible organisations such as regulators, researchers and media groups [Checked claim 3422]. ai notis. https://ainotis.com/c/3422

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