Anthropic has announced plans to watermark text generated by its artificial intelligence models, including Claude, as the company moves to comply with new European Union transparency requirements for AI-generated content.

The AI company confirmed the move in an updated support page, saying models released from August 2 will automatically include technology designed to mark AI-generated text and files.

The move follows the implementation of the EU AI Act’s transparency requirements on August 2, which require providers of generative AI systems to make AI-generated or manipulated content identifiable by machines.

Anthropic said the watermark embedded in its AI-generated text will remain with the content when users copy and paste it, potentially making it easier for other systems to identify material produced or edited by its models.

For files, Anthropic said it is using the Coalition for Content Provenance and Authenticity (C2PA) open standard, which provides information about the origin and history of digital content.

The company also plans to extend the watermarking technology to older models, expanding the system beyond models released after the August 2 regulatory deadline.

“Because the watermark is part of the text, it will travel with the text when it’s copied and pasted elsewhere, and may persist through some editing. Watermarking will be applied at the model level, which means it will be present no matter which Claude product or surface the text comes from,” the support page reads.

It remains unclear how much editing would be required to remove Anthropic’s watermark from AI-generated text. Anthropic has been asked to clarify the issue, with further details expected if the company responds.

The company said the watermarking technology will apply across several of its products and services, including the Claude platform API, Claude, Claude Code, Claude Cowork and Claude Tag.

AI platforms are increasingly moving to watermark or otherwise identify AI-generated content as they face growing pressure from users and regulators over transparency and authenticity.

Last week, AI music platform Suno said it would begin marking tracks created on its platform, following a series of legal challenges involving AI-generated music.

Anthropic’s move comes as AI companies face growing pressure from regulators, businesses and other organisations to improve transparency around synthetic content and make it easier to distinguish AI-generated material from human-created work.