Anthropic plans text watermarking for future Claude models
Anthropic announced that future Claude models will launch globally with a text watermark based on a variant of Google DeepMind's SynthID-Text method. The signal changes token-selection probabilities among acceptable outputs rather than adding hidden characters or user identifiers; older Claude models are scheduled to receive it over the coming months.
Why it matters: A model-level provenance signal could help platforms and investigators identify likely Claude involvement in longer generated passages, while avoiding visible marks or identity-bearing metadata.