Anthropic Adds Invisible Watermark to Claude Outputs for AI Transparency

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Anthropic has begun rolling out an invisible text watermark across Claude models and platforms, including its API, Claude Code, and cloud partner outputs. The watermark uses a SynthID-Text approach and is designed to help authorized parties verify whether content was AI-generated, without being detectable by ordinary readers. Anthropic developed the feature partly to comply with the EU AI Act and the EU Code of Practice on Transparency of AI-Generated Content, which it signed alongside roughly 190 other organizations. The company also plans to attach C2PA-based Content Credentials to certain supported files such as images, and a private-preview detection API for regulators and entities with transparency obligations is in the works. Anthropic clarifies that the watermark is not a search-ranking signal and does not affect content quality, though detection is probabilistic and heavy editing can reduce its reliability.

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