AI Weekly Malaysia

OpenAI will add an invisible watermark to ChatGPT and Codex output in the EU to comply with the EU AI Act's transparency rules, which took effect August 2, rolling out over the coming weeks to eligible users on all plans but only in the EU. Developers using OpenAI's API worldwide can enable it for select models starting now, but it is off by default and not a global default at launch. The method, called textGrain and described in a technical report co-written with University of Pennsylvania and Yale researchers, subtly shapes word choices so a detector with the secret key can flag the text; OpenAI's own tests show swapping 10% of words with synonyms drops detection from about 92% to 66%, and short passages, math answers, and translated text are harder to detect.

Why: If you ship an EU-facing product built on ChatGPT or Codex, the watermark is coming whether you opt in or not — but API users everywhere must explicitly enable it, so the default for your pipeline stays unchanged for now. The 92%-to-66% detection drop from a 10% synonym swap is the number to remember before you build any product feature or compliance claim on AI-text detection, and detector access is restricted to approved researchers and expert organizations.

OpenAI says API customers globally can now opt in to text watermarking for select models, but it remains off by default, and it will add an invisible textGrain watermark to eligible ChatGPT and Codex text output in the European Union over the coming weeks to meet EU AI Act machine-readable provenance rules. It is opening applications for a text watermark detector to approved researchers and expert organizations, plans to open-source the technology, and says textGrain matched or exceeded SynthID for text in evaluations while warning detection still has false positives and false negatives.

Why: If you build AI text features for EU users, watch the EU ChatGPT/Codex rollout and decide whether opt-in API watermarking is needed for your own outputs; if you mostly use the API outside the EU, nothing changes by default. Detector access is limited for now, so don't design a compliance or plagiarism-detection workflow around OpenAI's detector until it is broadly available or the open-source textGrain code ships. There is no direct Malaysia/SEA policy, funding, or infrastructure angle in this item.