SpaceXSI / xAI developer docs say text outputs from seven Grok models — including grok-4.7, grok-4.6, grok-4.5, grok-4.3 and the grok-4.20 family — carry an invisible statistical watermark by default starting Nov. 7, 2026, on all API endpoints. Responses expose an x-watermark header; team admins can opt out per model after confirming a legal exception. Data Studios summarized the same documentation and the EU AI Act marking rationale ahead of December compliance deadlines.
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AI / AIxAI Turns On Default Grok API Text Watermarking for Seven Models
Official docs say watermarking started Nov. 7, 2026, by default for grok-4.7 through grok-4.20 variants, citing EU AI Act compliance.
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