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A positive watermark detection indicates the text was processed by Claude and is marked as having been handled by that model. Anthropic cautions that this is not fully conclusive evidence of original authorship or provenance, since someone could have used Claude only to proofread or edit an existing document. Answered

Anthropic is embedding imperceptible, model-level watermarks directly into Claude-generated text and says it is working to enable Claude users and third parties to detect those embedded watermarks, with details on detection to come. A positive detection will mark text as being "processed by Claude," but Anthropic cautions that such a result will not be fully conclusive because use of Claude for proofreading or edits does not prove original authorship. Answered