Real estate agents edition

OpenAI announced on Monday 5 October that text from ChatGPT and Codex in the EU will get an invisible watermark. The technology is called textGrain. OpenAI says this will help it meet Article 50 of the EU AI Act, the European AI law. That article sets rules on transparency. The rules have applied since 2 August 2026. OpenAI will introduce the watermark over the coming weeks, in the EU only. It applies to all subscriptions, for users who are eligible. The mark stays in place when you copy and paste text. Do you put a property description from ChatGPT into your CRM (your customer system) or onto your website? The mark goes with it. A special program, called a detector, can recognise the pattern. For now, only approved researchers and organisations may use that detector. So you cannot check for the mark yourself, and neither can a buyer or a colleague. The next deadline is 2 December 2026. It applies to systems that were already on the market. textGrain slightly influences the choice of words. There are usually several options for each next word. ChatGPT then chooses words according to a pattern that a detector can find. The pattern is in the words themselves, not in a separate file. That is why it remains after you copy and paste. But the watermark has a weak spot. If someone changes a quarter of the words, OpenAI says detection falls from almost 100% to below 20%. If you rewrite a description a lot, little of the mark remains. If you use the text almost unchanged, the mark stays. A missing watermark does not prove that a person wrote the text. The mark also says nothing about whether the text is accurate. The facts in your listing, such as floor area, year of construction and energy rating, still need your own check. Do you use ChatGPT to write a description? Then you could note in your records that AI was used for the first draft, and which facts you checked yourself.

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