11 days ago
OpenAI is adding text watermarking in ChatGPT and Codex
What's happening
SignalsMonitor is following this as a technology story. BleepingComputer and The Verge are the outlets attached to this story. The first report grouped here was at 5 Oct 2026, 18:08 UTC. 2 material updates are listed in the timeline. The headline in use is “OpenAI is adding text watermarking in ChatGPT and Codex”. This note is SignalsMonitor's own briefing, not the publisher's article.
What we know
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 watermarking Anthropic announced…
Story timeline
Reports grouped into this story, earliest first. Exact repeats from the same outlet are collapsed.
- First reported by The Verge
- Picked up by BleepingComputer
OpenAI is adding invisible watermarks to ChatGPT and Codex text in the EU
Same story, different outlets
2 headlinesEach line is that outlet's headline. The article stays on the publisher's site.