Anthropic will watermark the text produced by its models, including Claude, to comply with European regulations, the company has now announced. The AI model maker confirmed the watermark on an updated support page.
Transparency provisions in the EU AI law, which came into force on August 2, require AI companies to mark AI-generated or edited content in a way that other systems can identify it.
Anthropic said all models released after August 2 will include technology that automatically watermarks both computer-generated text and files. For files, the company uses the C2PA open standard.
The company said it would also extend support for older models, adding that the watermark will move when users copy and paste text.
“Because the watermark is part of the text, it may move with the text when you copy and paste it elsewhere, and may remain due to editing. The watermark is applied at the model level, which means the watermark is present no matter which Claude product or surface the text comes from,” the support page states.
It is unclear how much editing users will need to do to remove the watermark. We’ve reached out to Anthropic for clarification and will update the story if we hear back.
The company said the watermark will be applied to a variety of products, including the Claude platform API, Claude, Claude Code, Claude Cowork, and Claude Tag.
Platforms are now rushing to watermark AI-generated content to avoid regulatory scrutiny following backlash from users. AI music platform Suno announced last week that it would mark songs created on its platform following a series of legal challenges. Last month, newsletter service Substack partnered with Pangram to flag AI-generated content. The company’s CEO, Chris Best, criticized “claud phishing,” a term used to describe people who use AI to generate content.
In addition to Anthropic, other companies including Black Forest Labs, Google, Meta, Microsoft, OpenAI, and Synthesia are committed to complying with EU norms.
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