It’s going to get a lot harder to let Claude be a ghostwriter for everything from novels to homework.

On Monday, Anthropic said new Claude models will embed an “imperceptible watermark” directly into AI-generated text. The watermark doesn’t change the text’s meaning or readability, but travels with it when copied and pasted and “may persist through some editing,” the AI lab said.

A watermark is a faint pattern or text embedded into photos or digital documents to help prove ownership and stop people from copying or stealing a piece of work.

The move is part of Anthropic’s commitments toward more transparency under the European Union AI Act…