Report: OpenAI Developed Text Watermarking Years Ago But Withheld It

nptacek · x · 2026-08-11

A recent tweet highlights that OpenAI developed text watermarking technology years ago but chose not to release it. A quoted discussion adds that Google's Gemini has been using SynthID since 2024, which biases the model toward certain tokens using a secret key to create a detectable statistical signature, effectively embedding an invisible watermark in all generated text.

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