70% of AI Product Recommendations Cite Sites That Earn Affiliate Commissions

Someone asks an AI engine for the best credit card for travel rewards. The answer names five cards and lists its sources underneath. Look at who wrote those sources and, seven times in ten, at least one is a review site that earns a commission when a reader signs up through its links.

Affiliate review sites are publishers that test or compare products and earn a commission when a reader buys through their links. AI engines use them to build their recommendations. For a brand, that makes coverage on those sites a direct input to whether AI recommends you. For a shopper, it means the AI shortlist often draws on the same review publishers that rank on Google.

The reliance is broad. 70% of AI answers to "best product" questions cite at least one affiliate review site, and in the average answer, one citation in three comes from one. Perplexity cites them in almost every answer, and money topics such as finance and insurance lean on them most.

On September 23, 2026 we asked 2,000 "best product or service" questions, such as "best robot vacuum" or "best life insurance", across 20 shopping categories, to five AI engines: ChatGPT, Gemini, Perplexity, Google AI Mode and Google AI Overviews (the AI summary above Google's search results). That produced 17,524 answers, and we recorded every web page each one cited.

An affiliate review site is one of about 150 review and comparison publishers that earn money through affiliate links, including Wirecutter, RTINGS, CNET, Tom's Guide, Forbes, NerdWallet, Bankrate and G2; each of the publishers named in this study discloses that it earns commissions through affiliate links. An answer counts as citing one when at least one of its sources comes from that list. A citation is a source link the AI engine shows with its answer.

AI engines answer shopping questions largely from the publishers that already review products for a living. Seven answers in ten cite at least one of them, and in the average answer that cites any source, 33.9% of the citations point to an affiliate review site.

These publishers write the pages that answer "best" questions directly, with a ranked list, the reasons behind each pick, specifications and prices. An AI engine assembling a shortlist finds that work already done. The effect for a brand is that a review publisher's verdict now reaches shoppers twice, once in Google's results and again inside the AI answer, often without the shopper clicking through.

Every AI engine uses affiliate review sites, but the rate varies widely. Perplexity cites one in 99.4% of its product answers, effectively every time. Google AI Overviews follow at 79.3% and Google AI Mode at 70.1%.

ChatGPT cites an affiliate review site in 61% of product answers and Gemini in 54.7%, the lowest rate, but still more than half. Google's AI features, which sit on top of Google Search, cite these publishers more often than ChatGPT or Gemini do. No engine answers product questions without them.

The question topic moves the rate as much as the engine does. 90.2% of AI answers to "best" finance questions cite an affiliate review site, nine in ten, followed by insurance at 85.8%, home at 84.3% and streaming at 83.1%. These are categories where buyers compare plans, rates and prices before choosing, the work comparison publishers specialize in.

Health (50.2%) and electronics (43.7%) sit at the bottom. Health answers lean more on medical and government sources. Pets (57.8%) and travel (59.2%) are also below the overall rate. If you sell in finance, insurance or home goods, the review publishers in your category are close to unavoidable in AI answers.

A handful of publishers carry most of the weight. Forbes appears in 14.4% of all AI product answers, about one in seven, followed by Wirecutter at 10.3%, PCMag at 9.4% and NerdWallet at 8.7%.

Consumer Reports, TechRadar, CNET, Tom's Guide and RTINGS each appear in about 7% of answers. A brand that earns a place in their roundups is placed in front of every engine that reads them.

Treat review publishers as part of your AI visibility plan. List the review sites that appear in AI answers for your category, then make sure each one has what it needs to cover you: review units, current specifications, pricing and a press contact. A product left out of the roundup an AI engine cites is left out of the AI answer too.

Check what those publishers already say about you. If a cited roundup has your old price, a discontinued model or a missing feature, the AI answer repeats the error. Asking the publisher to update a stale review is often faster than trying to change the AI answer directly.

Then track the result. Ask each engine the "best" questions your customers ask, note which publishers it cites and whether you are named. Working with an ai seo company that maps the sources AI engines use in your category shows you which publishers to pursue first.

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