studies
We ask the major AI engines which businesses they recommend in Vienna, and we disclose the data, the methodology and the exact questions.
🇩🇪 Deutsche Versionthe one business in all four AIs is not that business any more
We re-measured an industry word for word after almost three months. Agreement fell from 1 to 0, without the venue changing a thing. New as well: the dentist industry and the buying question.
Google AI Mode · 12 questions, 119 answershow does google's ai find its information?
Twelve Vienna questions, each asked ten times in Google's AI Mode. On questions with a place, every source was a Google Business Profile, Reddit never appeared, and about half of the named businesses change from answer to answer.
ChatGPT · Ads or GEOchatgpt ads or geo: which delivers more?
What ChatGPT ads cost, what they deliver and who may run them. More than 200 sources analysed, plus 9 questions without login in Vienna: not a single ad. And paying does not get you recommended.
ChatGPT · Before and after GPT-6how does chatgpt find its information?
Two Vienna questions, word for word the same as in June and September, asked six times on GPT-6. ChatGPT still searches on every question, but no longer cites Reddit, and the business data comes from Google Business Profiles.
Dentistrywhich dentist does AI recommend?
Four AIs, two questions, one day. First generally for a good dentist, then specifically for a dental implant. Of 17 recommendations, only 2 survived the switch to the buying question.
Real estate · district studywhich agent does AI recommend, district by district?
Six Vienna districts, the same question, four AIs, and six completely different agent lists. Why the city-wide names appear nowhere, and who still wins everywhere.
Animal healthwhich vet does AI recommend?
Four AIs, 16 different practices, none in all four. We fact-checked every recommendation, from the address to the website, and showed where AI gets it wrong.
Tax advisorywhich tax advisors does AI recommend?
Four AI engines, over 30 firms, and not a single one named by all four. How the AIs split into two camps, and why.
Diningwhich restaurants does AI recommend?
ChatGPT, Perplexity, Gemini & Google's AI Mode tested: 31 venues named, only one recommended by all four.
where does chatgpt get its information?
Memory or web search, its own index or Google: how ChatGPT with GPT-6 finds information, what changed on 8 August and which crawlers OpenAI sends. With sources and with what nobody knows for sure yet.
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