# xAI will start watermarking Grok text on its API by default, and team admins can opt out per model



xAI



No code changes are needed, and xAI says the watermark doesn't affect response quality or speed. It covers Grok 4.7, 4.6, 4.5, 4.3 and the grok-4.20 models in the Responses and Chat Completions APIs, including structured outputs and tool call arguments. xAI says it's doing this to comply with the EU AI Act. An x-watermark header shows whether a response was marked, and access to the detection API is by application. Opting out is set per model for the whole team, requires confirming that a legal exception applies, and some models may be locked on.

- Effective time: Nov 07, 2026
- Review updated: Nov 01, 2026 01:59 Sun · Beijing Time (UTC+8)

## Sources

- Source excerpt: https://docs.x.ai/developers/advanced-api-usage/watermarking

Canonical entry: https://www.ailyre.com/source/?id=xai-api-text-output-watermarking-2026-11-01&lang=en