Do AI search engines like ChatGPT or Perplexity favor big-name brands over smaller ones when deciding what to cite?

This explores how often AI search engines name or cite brands, and whether that rate changes from one engine to another. A gap up front: the corpus doesn't break citation rates down engine by engine. What it does show is that the biggest differences are between kinds of brand, not between engines. Ranqo looked at more than 100 brands across five AI engines and found a steep ladder. Global names were cited 73% of the time, mid-market brands 44%, and niche brands 11% Do AI search engines favor well-known brands over others?. The ladder held even when the query didn't name any brand. That suggests the engines mostly repeat whoever is already prominent, rather than finding the best fit for the question.

The ladder makes more sense once you look at where the engines get their sources. In the same research, 78% of citations pointed to corporate websites, and ranked "best-of" listicles made up 21% Where do AI search engines actually pull their citations from?. The specific recommendations changed from query to query, but that narrow pool of sources stayed the same. So when someone asks why engine A named a brand and engine B didn't, the answer may often be which listicle each one happened to pull. Big brands appear in more of those lists, so their lead builds on itself.

Why does it matter whether you get cited? Because being named turns out to change what people do. One clickstream study found that when an AI assistant recommended a brand to people who weren't already its customers, searches for that brand name rose 4.3 percentage points. Visits to the brand's site rose 2.4 points, and visits to retailers rose 1.0 point Do AI assistant brand mentions drive real user behavior?. The same paper has a warning for anyone measuring "AI visibility." If you lump all brand mentions together, the effect looks about twice as large as it really is, because existing customers and passing mentions inflate it Does pooling AI brand mentions mask the true recommendation effect?. Many brand-citation dashboards likely carry that inflation.

The result you might not have expected: citations persuade readers whether or not they're relevant. In 24,000 Search Arena comparisons, users preferred answers with more citations, and irrelevant citations raised preference almost as much as relevant ones Do users trust citations more when there are simply more of them?. Being cited also doesn't mean getting the traffic. A randomized field experiment found Google's AI Overviews cut clicks to outside sites by 39.8% Do AI Overviews actually reduce clicks to publisher sites?. Ahrefs found clickthrough on the top organic result was about 58% lower for keywords that show an AI Overview How much are AI Overviews actually reducing organic search clicks?. Put together, for most brands the value is in being named inside the answer, not in the click that follows. And the engines decide who gets named mostly by how well-known a brand already is.