Grok Watermarks Text by Default

This is a meaningful provenance feature for developers, but it remains a probabilistic signal rather than durable proof of authorship.

• –Applies across Grok’s Responses and Chat Completions APIs.
• –The `x-watermark` response header lets developers verify whether a request was watermarked.
• –Watermarking slightly shapes token selection without adding visible characters or metadata.
• –Detection is statistical and becomes stronger with longer text, making heavily edited outputs harder to classify.
• –The team-level opt-out gives API operators control, but individual users may have little say inside managed deployments.