Tech

OpenAI is adding text watermarking in ChatGPT and Codex

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Based on a feed excerpt; full article content has not been acquired. Source evidence retrieved 05/10/2026, 18:16:25 UTC.

Briefings

OpenAI announced the rollout of text watermarking in ChatGPT and Codex for EU users, matching or exceeding Google DeepMind's SynthID benchmark. The system adds invisible machine-readable markers to text outputs to comply with the EU AI Act, though OpenAI claims performance scores remain comparable to unwatermarked versions. This initiative began in October 2026 and is currently limited to the European Union region.

Key points

• OpenAI implemented text watermarking in ChatGPT and Codex for EU users, matching or exceeding Google DeepMind's SynthID benchmark.
• The watermarking system was introduced in October 2026 to comply with the EU AI Act requirements.

Context and limitations

Coverage is limited to the European Union region; performance comparisons are based on OpenAI's internal scores rather than independent verification.

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