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OpenAI is adding text watermarking in ChatGPT and Codex
The Verge
October 5, 2026
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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 water
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