Anthropic has begun embedding an imperceptible watermark in all text its newest Claude models generate. The change took effect for models launched in the EU on August 2, 2026, and Anthropic says it will apply worldwide. Anthropic laid out the plan in a support article after signing the EU AI Act’s Code of Practice on transparency. In other words, it’s not exactly volunteering to do this.
Source: Anthropic Is Watermarking Every Claude AI Output. Builders Are Already Trying to Break It