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OpenAI is adding text watermarking in ChatGPT and Codex

Zac Boring October 5, 2026 1 min read
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Key takeaway

An invisible, machine-readable watermark in text output is rolling out to ChatGPT and Codex, but only for users in the European Union at first.

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From The Verge AI

An invisible, machine-readable watermark in text output is rolling out to ChatGPT and Codex, but only for users in the European Union at first. OpenAI says its textGrain watermarking "matched or exceeded" other approaches like Google DeepMind's SynthID for text, which is also the basis for the watermarking Anthropic announced in August. Like OpenAI, Anthropic […]

By Stevie Bonifield

Read the full article at The Verge AI →