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Anthropic Embeds Invisible Text Watermarks in Claude to Flag AI-Generated Content

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Anthropic has introduced imperceptible text-level watermarking in its Claude AI models, embedding markers directly into generated text rather than using removable metadata. The move aligns with the EU AI Act's Article 50(2) Code of Practice, which requires generative AI providers to mark AI-generated content in a machine-readable, manipulation-resistant format. The watermark persists through copy-paste operations and may survive some editing, and applies across all interfaces and third-party applications using Claude's API. Content creators and developers using Claude will have no option to disable the watermark, as it is applied automatically at the model level. Anthropic has not publicly disclosed the detection mechanism, citing likely concerns that transparency about the algorithm could make it easier to circumvent.

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