Anthropic has announced that its AI models will now include invisible watermarks in text and metadata in files generated by Claude. These watermarks are intended to identify content as AI-produced, a step taken to align with new European Union transparency requirements. According to the company, these markers are designed to be imperceptible to human users while remaining machine-readable.

The implementation applies to models launched in the EU after August 2, though Anthropic has stated the watermarking will be applied to Claude content globally. The system uses two primary methods: embedding patterns directly into the generated text and attaching metadata to media files.

Industry analysts note that this development could have practical implications for corporate communications teams. For instance, if a human-drafted press release is processed by Claude for translation, formatting, or minor editing, the resulting document may be tagged with an AI signature. This raises questions about how organizations will distinguish between AI-assisted human work and content created entirely by artificial intelligence. While the technology aims to increase transparency, it also creates a new layer of technical identification that could affect workflows where AI is used as a secondary tool rather than a primary author.