# OpenAI's EU Text Watermarking Plan

> OpenAI rolls out EU text watermarking with phased transparency tools.
- Title: OpenAI's EU Text Watermarking Plan · OpenAI | Shortify
- Summary: OpenAI rolls out EU text watermarking with phased transparency tools. OpenAI introduces EU-specific text watermarking for ChatGPT and Codex, allowing opt-in…
- Keywords: openai, text watermarking, chatgpt, codex, content provenance, ai act, text grain, watermark detector, api customers, technology, OpenAI's, Text
- Source: OpenAI — https://openai.com/index/eu-text-provenance
- Read time: 1 min
- Topics: openai, eu, text watermarking, chatgpt, codex, content provenance, ai act, text grain, watermark detector, api customers, ai, technology
## EU AI Act Response
OpenAI shares its approach to EU text provenance rules for transparency within current technology limits.
## Text Watermarking Launch
API customers globally can now opt in to text watermarking for select models starting today.
## EU Text Watermarking Timeline
Over coming weeks, openai will add invisible watermarks to eligible chatgpt and codex text outputs in the european union.
## Watermark Detector Access
Openai opens applications for researchers and expert organizations to access text watermark detector.
## TextGrain Technology
Text grain adds invisible statistical signal to model word choices for watermark detection.
## Watermark Detection Performance
Text grain matched or exceeded other approaches including synthid for text in evaluations.
## Detection Challenges
Shorter text and constrained content like mathematics are harder to detect with watermarks.
## Editing Weakens Watermarks
Replacing 10% of words with synonyms reduced watermark detection from 92% to 66%.
## Impact on Model Performance
Watermarking shows no meaningful performance differences across astra benchmarks.
## What Watermarks Don't Reveal
Watermarks don't measure human contribution, ownership, user identity, or text accuracy.
## Next Steps for EU
Openai will roll out text watermarking to eligible chatgpt and codex users across all eu plans.
## API Customer Options
Openai enables api customers to opt in to watermarked text outputs for select models globally.
## Researcher Access Rules
Approved researchers get case-by-case access to watermark detector per code of practice.
## Key takeaway

OpenAI introduces EU-specific text watermarking for ChatGPT and Codex, allowing opt-in API use and researcher access while clarifying what watermarks don't reveal.