What this log is: a dated list of 2026 changes to ChatGPT, Google's AI search features and Microsoft's tools that affect how a brand is found in AI answers, or how that is measured. Each entry was read at its source, which is linked. Check it before you explain a jump or a fall in your own numbers. Last updated 12 November 2026.
How to use it
Put the date of your change beside the dates below. If a platform changed in the same week, look at that first. Each entry has three parts: what changed, the source, and a line on why it matters. The last part is our view.
Model releases have their own page: see our log of model releases.
November 2026
10 November: OpenAI opens Businesses in ChatGPT
- What changed. OpenAI launched Businesses in ChatGPT in beta. Through Business Hub a company can claim its business and, once verified, update key details and add product feeds with pricing and availability (OpenAI, 10 November 2026).
- New reporting. Business Hub shows aggregated insights: the number of mentions and website clicks a business receives, and "discovery topics", which OpenAI describes as common themes across conversations where the business's website is cited. OpenAI says insights appear only above certain thresholds.
- Business Agents. Available to eligible ecommerce and online service businesses in the United States. OpenAI says a Business Agent conversation is clearly labelled and distinct from ChatGPT's independent answers.
- Why it matters. A business can now supply its own details to ChatGPT and see a mention count from OpenAI itself.
October 2026
14 October: missing ChatGPT tracking tags reported, back the next day
- What changed. Search Engine Roundtable reported that links in ChatGPT answers had stopped carrying the utm_source=chatgpt.com tag, starting around the GPT-6 release a week earlier (Search Engine Roundtable, 14 October 2026). Without a tag or a referrer, analytics tools file the visit as direct.
- What happened next. On 15 October Cedric Huesler of Adobe, who had documented the drop, said it was a bug and that ChatGPT was tagging its links again (same report, updated).
- Why it matters. A fall in ChatGPT referrals in the second week of October may be a labelling gap. We wrote it up in a week without ChatGPT referrals.
7 October: GPT-6 arrives in ChatGPT
- What changed. OpenAI began rolling out GPT-6 in ChatGPT to Plus, Pro, Business and Enterprise plans on 7 October, and to Free and Go plans from the next day (OpenAI, 7 October 2026).
- On search. OpenAI says GPT-6 "makes better decisions about when to look something up and more reliably finds information that supports its answer".
- On format. Answers can now include graphics, buttons, forms and charts, which OpenAI calls Intelligent UI.
- Why it matters. A model change can affect which brands an answer names. Compare readings taken before and after 7 October with that in mind.
August 2026
31 August: Search Console's generative AI reports reach every site
- What changed. Google's note on its announcement reads: "As of August 31, 2026, we've rolled out these insights to all websites worldwide" (Google Search Central Blog, 3 June 2026).
- Why it matters. The rollout is worldwide. Whether a site sees the report still depends on its impressions and settings. See what the report counts.
31 August: ChatGPT Ads self-service opens in Europe
- What changed. OpenAI updated its Europe announcement to say self-service access through Ads Manager was available across the 31 European markets (OpenAI, 18 August 2026).
18 August: OpenAI announces ChatGPT Ads for 31 European countries
- What changed. OpenAI said ChatGPT Ads would expand to 31 European countries the following week, shown only to users on the Free and Go plans (OpenAI, 18 August 2026).
- What OpenAI says about answers. "Ads in ChatGPT are always clearly labeled and separate from ChatGPT's answers, and advertising does not influence the answers ChatGPT provides."
- Why it matters. Track paid placements separately from organic answers in European markets. More in ChatGPT Ads in Europe.
3 August: Microsoft Clarity splits branded and non-branded AI queries
- What changed. Microsoft Clarity added branded query segmentation to its AI Citations dashboard. Queries are marked as branded, the Share of Authority card splits by branded and non-branded, and the dashboard can be filtered either way (Microsoft Clarity, 3 August 2026).
- Why it matters. You can separate citations from AI searches that mention your brand from those that do not. See our guide to Clarity's grounding queries.
June 2026
3 June: Google launches generative AI performance reports in Search Console
- What changed. Google announced Search Generative AI performance reports in Search Console, rolled out first "to a subset of websites" (Google Search Central Blog, 3 June 2026).
- Why it matters. It gave site owners a dedicated view of impressions from Google's generative AI features.
January 2026
27 January: Gemini 3 becomes the default model for AI Overviews
- What changed. 9to5Google reported that Gemini 3 was now the default model for AI Overviews around the world, and that tapping "Show more" on an Overview would open AI Mode for follow-up questions, rolling out globally on mobile (9to5Google, 27 January 2026).
- Why it matters. It changed the model behind AI Overviews and made AI Mode one tap away from an Overview. More in how to appear in Google AI Overviews.
What goes in the log
A change goes in when it meets two tests. It alters how a brand is found in an AI answer, or how that can be measured. And we have read it at the source. We add entries as changes are announced and date every update at the top.
Frequently asked questions
Why did my AI visibility change overnight?
Check the platform first. A new model, a new answer format or a tracking change can move the numbers while your brand did nothing. Match your date against this log, then read the answers themselves.
Did ChatGPT traffic really fall in October 2026?
For about a week, many ChatGPT links arrived without a tracking tag or referrer, so those visits were filed as direct. It was reported on 14 October and described as a bug the next day, when the tags returned.
Can a business update its own details in ChatGPT?
Yes, since 10 November 2026. OpenAI's Business Hub, in beta, lets a verified business update key details and add product feeds.