OpenAI is adding text watermarking in ChatGPT and Codex

The VergeOct 5, 2026Oct 5, 2026, 2:08 PM AST

Text watermarking hides a machine-readable signal inside generated words, so detection software can flag that a model wrote them with no visible label. OpenAI says its textGrain method, first rolling out to ChatGPT and Codex users in the European Union, matched or beat similar systems, though it does not guarantee reliable detection and cannot prove who wrote a text.

Summary written with AI by HowTechMoves, based on reporting by The Verge.

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