A new Semrush study analyzing ChatGPT responses across 1,094 categories in the US market, spanning more than 50,000 brands across 220,000 domains, shows just how rare ChatGPT topic ownership actually is between January and June 2026.
The study defines "clear ownership" as a brand holding the top mention share in at least four of five prompts, with a lead of five or more points over the runner-up. Only 15.2% of categories met that bar. Another 31.2% had an "emerging leader" without full dominance, and the remaining 53.7% had no dominant brand at all.
Ownership was weakest precisely where demand was highest. Only 11.3% of high-demand categories had a clear owner, versus 19% for lower-demand categories — notable given that the top half of categories by demand accounted for 98% of AI search volume, yet lacked a clear brand leader.
Traditional SEO metrics explained little about who wins ChatGPT topic ownership. The only metric that reached statistical significance was branded search volume, and even there the leading brand was ahead just 55.7% of the time. Organic traffic performed worse — the leading brand was ahead in only 48.4% of cases — and Authority Score reached just 52.4%.
An equally striking finding is the gap between citation and mention: the domain cited most often in a category matched the brand mentioned most often only 21% of the time. Being linked as a citation in an AI response does not guarantee your brand shows up in the generated text itself.
Stability was conditional. Clear category owners retained the top spot 90.4% of the time month over month — but narrow leads were vulnerable. When a brand lost its position, the average gap it held was just 1.3 percentage points, versus 2.9 points for leads that held steady.
This research suggests brand visibility in AI search is still largely unclaimed territory. With more than half of categories lacking a dominant brand — especially the highest-demand ones — late entrants still have real room to compete for ChatGPT topic ownership. Related work on topical authority in AI search reinforces the same idea.
The approach, however, has to differ from the standard SEO playbook. Since organic traffic and Authority Score correlate weakly with ChatGPT dominance, practitioners should focus less on backlinks and citations alone and more on strategies that get the brand actually mentioned within AI-generated text — an idea explored further in GEO-focused content positioning. Growing branded search demand, and pushing any lead to at least a 3-point margin once achieved, are the practical levers for durability. For help building an AI-search-ready content strategy, get in touch.
It's when a brand holds the top mention share in ChatGPT responses across most prompts in a category, with a meaningful lead over the next brand — a bar that Semrush found only 15.2% of categories met.
Not well. Branded search volume was the only metric reaching statistical significance, and even it predicted the leading brand correctly just 55.7% of the time. Organic traffic and Authority Score performed worse.
A citation is a linked source in an AI response; a mention is the brand actually named in the generated text. The two aligned only 21% of the time, meaning citations don't guarantee brand mentions.
Grow branded search demand and, once you hold a lead, aim to extend it to at least 3 percentage points — leads that size proved far more stable than narrow ones.
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