Anthropic Adds Invisible Watermarks to Claude-Generated Text and Files

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Anthropic has introduced invisible text watermarks and C2PA provenance metadata for content produced by Claude, its AI assistant, to make AI involvement more transparent. The rollout is partly driven by European AI transparency regulations and applies across Claude products, APIs, and cloud partners including AWS, Google Cloud, and Microsoft Foundry. New Claude models launched on or after August 2, 2026 will carry the marking from day one, with older models to be covered gradually. Detection is probabilistic, not conclusive — a watermark's presence or absence cannot confirm or rule out AI authorship with certainty. Anthropic is also launching a private detection API restricted to regulators, media organizations, researchers, and select enterprises, rather than the general public.

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