And Claude has a watermark now.
Summary
Anthropic has added a watermark to Claude's generated content, enabling better identification of AI outputs.
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Anthropic says it will watermark text generated by its AI models
Anthropic announced it will watermark text generated by its AI models, including Claude, to comply with the EU AI Act's transparency obligations. The watermark is applied at the model level, persists through copy-paste, and uses C2PA for files.
Aug 14, 2026AnnouncementsHow Claude’s text watermark works
This article explains how Anthropic implements text watermarking in Claude to comply with the EU AI Act, detailing the method's technical aspects and its impact on output quality.
Claude's new Scarlet Letter watermark is invisible — for now
Anthropic announced it will invisibly watermark all content processed by its Claude models, not just AI-generated text, to comply with the EU AI Act. This 'scorched earth' approach may flag even lightly edited human writing, raising concerns about overreach and easy circumvention by bad actors.
Claude now embeds invisible watermarks in all text outputs + signed metadata on files
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Some Claude users are mad that Anthropic’s new watermarks will catch them using it at their jobs, classes
Anthropic has begun watermarking Claude's outputs to comply with the EU AI Act, drawing criticism from some users who fear being caught using the AI at work or school, though many online argue the complaints are overblown.