SpaceXSI's developer docs say that from Nov. 7, 2026, text from grok-4.7, grok-4.6, grok-4.5, grok-4.3 and three grok-4.20 API variants will include an invisible watermark by default. The mark shapes token choice, adds no characters, and covers ordinary text, structured outputs and tool-call arguments. Team admins can opt out per model after confirming a legal exception. The docs cite the EU AI Act and say quality and speed are unchanged. TeslaNorth reported the docs on Oct. 31.
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