Provenance Lens
Does Claude Watermark Text?
Anthropic documents statistical marking for newer Claude models, but no public detector. Learn what the mark would mean and what remains uncheckable.
Current answer
Anthropic says newer Claude models mark generated text statistically. No public detection mechanism is available, so Provenance Lens reports this check as UNSUPPORTED.
What a future match would mean
Anthropic describes the mark as evidence that Claude processed text, not proof that Claude authored every word. Editing and paraphrasing can also affect the signal.
What a report cannot prove
- A valid signature proves who signed a manifest, not that the manifest's claims are true.
- Metadata is trivially editable. Treat generator fields as an indication, never as proof.
- Hidden Unicode characters have many innocent causes, including ordinary copy-paste.