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OpenAI is adding invisible watermarks to ChatGPT and Codex text in the EU

BACKGROUND
1 SIGNALFIRST DETECTED 5 October 2026
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How the story developed
Other feeds and industry voices
5 Oct
OpenAI will start watermarking ChatGPT’s text in the EU

OpenAI will watermark ChatGPT and Codex text in the EU to comply with the AI Act. Editing can make the invisible marks harder to detect, it says.

REPORT · WHO · TechCrunch AIOPEN STORY
6 Oct
OpenAI To Watermark ChatGPT Text In The EU, Opens API Opt-In via @sejournal, @MattGSouthern

<p>OpenAI will add an invisible watermark to ChatGPT and Codex text in the EU. Its tests show editing can weaken it. </p> <p>The post <a

REPORT · HOW · Search Engine JournalOPEN STORY
5 Oct
OpenAI is adding text watermarking in ChatGPT and Codex

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

REPORT · WHO · The Verge TechOPEN STORY
5 Oct
OpenAI explains how it will watermark ChatGPT text to comply with EU provenance rules

<table> <tr><td> <a href="https://www.reddit.com/r/ChatGPT/comments/1wycig7/openai_explains_how_it_will_watermark_chatgpt/"> <img alt="OpenAI explains how it will watermark

OPINION · HOW · ChatGPTOPEN STORY
5 Oct
Our approach to EU text provenance rules

How OpenAI is approaching text watermarking under EU rules. Learn where watermarks apply, how detection works, and why access starts with researchers.

REPORT · WHERE · OpenAI NewsOPEN STORY
6 Oct
Doesn’t OpenAI’s watermarking affect the quality of the models?

<table> <tr><td> <a href="https://www.reddit.com/r/LocalLLaMA/comments/1wypgkq/doesnt_openais_watermarking_affect_the_quality_of/"> <img alt="Doesn’t OpenAI’s watermarking affect

OPINION · WHAT · LocalLLaMAOPEN STORY
11 Aug
🤖 Claude will start marking AI generated content by adding an imperceptible watermark directly into the text itself as part of Anthropic commitments after signing the EU AI Act's Article 50(2) Code of

🤖 Claude will start marking AI generated content by adding an imperceptible watermark directly into the text itself as part of Anthropic commitments after signing the EU AI Act's

OPINION · WHAT · Aleyda SolisOPEN STORY
26 Apr
GPT Image 2’s grime artifacts expose OpenAI’s quiet watermark strategy

<table> <tr><td> <a href="https://www.reddit.com/r/ChatGPT/comments/1svzyti/gpt_image_2s_grime_artifacts_expose_openais_quiet/"> <img alt="GPT Image 2’s grime artifacts expose

OPINION · WHAT · ChatGPTOPEN STORY
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