Update
xAI Adds Text Watermarking to Grok API Models
xAI, a company that provides Grok API models, has updated its service to include a hidden statistical fingerprint in the output of its Grok API models starting November 7, 2026. This change leaves ChatGPT as the only model in North America that does not watermark its text. The watermark is enabled by default and covers multiple model versions and text generation endpoints.