Tibor Blaho(@btibor91):OpenAI is rolling out text watermarking for the EU AI Act - opt-in for API customers globally for select models starting today, ChatGPT and Codex text in the EU gets an invisible watermark over the coming weeks textGrain adds an invisible statistical signal to the model's word choices, matched or beat SynthID for text in OpenAI's tests with no meaningful quality hit and is going open source

Tibor Blaho

@btibor91

Lead Engineer at @AIPRMcorp ( and @lrt_co ( building AIPRM for ChatGPT & Claude. Signal @ btibor.91

Joined July 2011

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Tibor Blaho@btibor91

2026.10.05 15:16

OpenAI is rolling out text watermarking for the EU AI Act - opt-in for API customers globally for select models starting today, ChatGPT and Codex text in the EU gets an invisible watermark over the coming weeks textGrain adds an invisible statistical signal to the model's word choices, matched or beat SynthID for text in OpenAI's tests with no meaningful quality hit and is going open source