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We asked ChatGPT, Gemini and Perplexity the same 900 unbranded World Cup questions twice: once through their official developer APIs, once through the real consumer interfaces people actually use. Then we compared every brand in every answer.
If your AI visibility monitoring runs on the official APIs, it is measuring a distribution of brands that barely overlaps with what consumers are shown. Across 2,565 matched prompt pairs, the average overlap between the brand set in a UI answer and the brand set in the matching API answer was 6 to 12 percent, depending on the engine. The first brand mentioned, the one that wins the recommendation, matched in only 9 to 16 percent of answers.
The starkest difference is sourcing: the real ChatGPT product reads 3.5x more sources per answer than its API, and leans on reddit.com (284 answers) and goal.com, while the API's most-cited domain after fifa.com is ftc.gov. Different reading lists, different recommendations.
Gemini inverts the pattern: the consumer UI names 2.3x more brands per answer than the API, and one in four UI answers ships with no visible sources at all. Gemini's grounded API reads broadly (reddit.com appears behind 436 answers) but compresses to fewer named brands.
The closest product to its API in spirit, yet the widest brand gap of all three. The API's source mix is dominated by social (facebook.com behind 469 answers, instagram.com behind 401); the consumer product leans on youtube.com and editorial sources. Adidas, Fanatics and Puma reach fans through the UI and are invisible in the API's top brands.
API-based monitoring is a different instrument, not a cheaper one. With 6 to 12 percent brand overlap, an API readout is not a noisy version of the consumer answer. It is a different answer.
The recommendation winner flips in roughly 6 of 7 answers. If your dashboard says you own a category, there is an 85 percent chance the interface your buyers use disagrees.
Sourcing behavior, not model quality, drives the gap. ChatGPT's UI reads 3.5x more sources than its API. Gemini's API reads more but names fewer brands. The retrieval layer is the product decision.
Reddit is the consumer layer's hidden referee. reddit.com is a top-3 cited domain in the UI channel of all three engines. Brands with no Reddit presence are negotiating with a judge they cannot see.
Affiliates win the interface. NerdWallet, Goal.com and Booking.com appear in consumer answers where the APIs name none of them. The recommendation economy has already moved inside the answer.