Anthropic to watermark Claude outputs using SynthID-Text method to meet EU AI Act
Anthropic announced that future Claude models will embed an imperceptible probabilistic text watermark (using the SynthID-Text approach) to enable likelihood-based detection that Claude produced the text, as part of compliance with the EU AI Act. The company says the watermark adds no visible characters, incurs no extra tokens or cost, is not user-identifying or traceable, and has shown no measurable impact on output quality in internal and referenced tests.