TechOpenAI is adding text watermarking to ChatGPT and Codex

OpenAI is rolling out an invisible, machine-readable textGrain watermark for ChatGPT and Codex users in the European Union first. The company says it performed as well as or better than other approaches, but cautions that it cannot guarantee reliable detection, verify accuracy, establish ownership, measure human contribution, or prove human authorship. API customers worldwide can opt in for select models, while approved researchers and expert organizations can apply for detector access.

OpenAIChatGPTtext watermarkingEU AI Act

TThe Verge★★☆☆☆2026-10-05 18:08Original