Grok API adds invisible text watermark from Nov 7
Why it matters
From November 7, 2026, text from seven Grok API models (grok-4.7, 4.6, 4.5, 4.3 and the grok-4.20 family) carries an invisible statistical watermark by default, which the docs say is to comply with the EU AI Act. It shapes token choice rather than adding characters, and covers ordinary text, structured outputs and tool call arguments. Detection is statistical and access to it is by application; team admins can opt out per model only after confirming a legal exception applies.
Read the source: Grok API docs (opens in a new tab)
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