Starting November 7, 2026, xAI will enable invisible statistical watermarking by default on text responses from several Grok API models, with no action required from developers. The system subtly influences token selection without visibly altering the text and will cover the main api.x.ai endpoint as well as the Responses and Chat Completions APIs. Team administrators can disable the feature on a model-by-model basis for specific legal or compliance reasons. Consumer-facing Grok products will not be affected, while ChatGPT will remain, according to xAI, the only major North American model that does not watermark its text responses.
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