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Grok: watermarking API-generated text

This dossier follows identification of text generated by the Grok API, supported models, opt-out settings and detection access.

Last updated : 1 key moments
Grok symbol.
Grok symbol identifying the service. — xAI / Wikimedia Commons — domaine public (géométrie simple), rendu PNG.

Where things stand

As of 31 October 2026, documentation announces a statistical watermark enabled by default on 7 November for seven models. Detection access is by application.

Reported information

Grok API to enable invisible text watermark by default on 7 November

xAI’s documentation, branded SpaceXSI and updated on 31 October 2026, announces default invisible text watermarking for seven Grok models from 7 November. The API change covers ordinary responses, structured outputs and generated tool arguments.

Grok symbol.
Grok symbol identifying the service. — xAI / Wikimedia Commons — domaine public (géométrie simple), rendu PNG.

The listed models are Grok 4.7, 4.6, 4.5, 4.3 and three 4.20 variants. The watermark slightly shapes token choices without adding hidden characters. Detection is statistical, may return uncertainty and requires access granted by application.

Administrators can opt out per model in the console, except for locked models, while accepting responsibility for applicable marking duties. The x-watermark header indicates whether a response was marked. The provider cites the EU AI Act; the documentation alone does not establish legal compliance or resistance to every form of text editing.

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