Google runs two shopping surfaces off what it says is one database, and they barely agree on anything. Productrise, an independent product-tracking firm, ran more than 100,000 queries across the US and UK between August 9 and August 31, 2026 and logged over 2,000,000 listings. Where a product did turn up in both AI Mode and the Shopping carousel on the same day for the same query, the first-listed seller was a different company 49.6% of the time and the price was different 38.1% of the time. Of those price gaps, 68.4% ran higher in AI Mode, at an average premium of 21.6%. Google answered on September 2, 2026: "all shopping results on Google Search, including AI Mode and the search results page, are powered by the same data source: our Shopping Graph." It disputed none of the figures. The two surfaces are also not the same list shown short and long: AI Mode showed a median of 3.9 products per query against the carousel's 27.8, and only 1.28% of carousel products appeared in AI Mode at all.
Fact bullets:
- Study window: August 9–31, 2026; 100,000+ queries and 2,000,000+ listings tracked across the US and UK.
- Only 1.28% of products shown in the Shopping carousel also appeared in AI Mode for the same query on the same day.
- Where products did overlap, the first-listed seller differed 49.6% of the time and price differed 38.1% of the time; 68.4% of price differences were higher in AI Mode, a 21.6% average premium.
- AI Mode surfaced a median 3.9 products per query versus 27.8 in the carousel; Google's September 2, 2026 statement confirmed both surfaces draw from the same Shopping Graph without addressing the divergence.
Credibility: HIGH. Reasoning below.
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For e-commerce brands and the marketing leads who own pricing: Google's reply is the most interesting thing in the study, because it is probably true and it does not help you. The Shopping Graph can be one database and still feed two different pickers. The carousel puts up 27.8 products and AI Mode puts up 3.9, and cutting a list from 28 to 4 is where the ranking happens, which is why the two surfaces share 1.3% of the merchandise and disagree on the seller half the time they do overlap. A Merchant Center feed tuned to win the carousel is competing for a different shortlist, and how it places there tells you little about this one.
The credibility line names Productrise's incentive, and it is worth holding onto: the firm sells product-feed-optimization software, so shopping-surface volatility being newsworthy is good for its business. Take that seriously and the figures still stand, because Google put the shared data source on the record and left every number alone. 1.28% is the figure that changes your week. It means nothing in your Merchant Center reporting will tell you which SKUs are affected, so someone has to go and look. If the price a buyer reads in an AI answer is stale, they do not know they are reading a different surface. They think you quoted them that number.
Recommended actions:
- Ask your web or e-commerce ops team to run a same-day price and seller comparison between Google AI Mode and the Shopping carousel for your 10–20 highest-traffic SKUs this week, and keep the screenshots.
- Check how often the Merchant Center feed syncs price, and flag any lag longer than 24 hours to the client. Productrise's data shows Google is not reconciling price between the two surfaces.
- Add an AI Mode price and seller spot-check to the monthly AEO report, next to the existing visibility-tracker numbers. The tracker tells you the direction; the spot-check tells you whether the number a buyer sees is yours. Where a client decides not to monitor it, record the reason.
Search Engine Journal: "Google AI Mode Prices Differ From Product Carousel For Same Items" by Matt G. Southern, Search Engine Journal, 2026-09-03, https://www.searchenginejournal.com/google-ai-mode-prices-differ-from-product-carousel-for-same-items/588227/
Productrise (Hugo Huijer): "Google AI Mode shows the same products 21.6% more expensive than traditional search" [Data Study], Productrise Blog, 2026-09-01, https://productrise.app/blog/google-ai-mode-prefers-more-expensive-products
PPC Land: "AI Mode shows the same products 21.6% more expensive, Productrise finds", PPC Land, 2026-09, https://ppc.land/ai-mode-shows-the-same-products-21-6-more-expensive-productrise-finds/
Futurism: "Google's AI Mode Is Ripping Shoppers Off With Vastly Higher Prices, Study Claims", Futurism, 2026-09, https://futurism.com/artificial-intelligence/google-ai-mode-higher-prices-study