Claude models released this month or later will support the feature by default, while Anthropic works to integrate it into older models. Claude models released this month or later will support the feature by default, while Anthropic works to integrate it into older models. Anthropic cautioned that extensive editing, paraphrasing, translation, or merging Claude outputs with other text may render the watermark undetectable, adding that it does not conclusively prove that Claude originally generated the text.