By James Calloway

Fewer than half of the top 100 mentioned brands also appeared in the matching top 100 citation lists in any month Semrush measured. That figure comes from Semrush's "2026 AI Visibility Index," which tracked 22 categories across four AI platforms, and it exposes a measurement problem most dashboards blur into a single number.

One score can't tell you whether your brand appears in the answer, whether your website supplies the evidence, or whether third-party sites carry the weight. Those are three different positions, and each one points to a different fix.

What separates a mention from a citation?

Semrush splits AI visibility into two metrics. A mention means the brand appears in the answer. A citation means a domain appears as a source.

Ford shows how far apart those wins can sit. In the U.S. in July, Ford appeared inside all four top-100 mention lists. Its citation rankings told a different story:

• 1,055th on ChatGPT
• 1,146th on Gemini
• 1,320th on AI Mode
• 748th on AI Overviews

The reverse gap exists too. In U.S. Finance on ChatGPT, Investing.com ranked seventh among cited domains but only 50th among mentioned brands.

The U.K. grocery market shows the same split at different magnitudes. Tesco and Asda both ranked in the top 100 for mentions on all four platforms. On ChatGPT, Tesco ranked 25th among cited domains while Asda sat at 606th. On Gemini, the gap narrowed to 29th versus 60th.

A brand team at Ford or Tesco needs to know which external pages the AI systems cite instead of their own. Investing.com has the opposite task — its source material already lands; the answer itself is where it's weak. Using one content tactic for both problems misses the point.

Does the platform change the picture?

Yes, and sharply. The platforms behave differently enough that a strong result on one says little about another.

Gemini mentioned more distinct brands per answer than ChatGPT in every U.S. month Semrush measured. ChatGPT included the most source entries per answer; Gemini included the fewest. Their source mixes diverge too:

• News and information sites led ChatGPT citations in the U.S.
• AI Overviews leaned on streaming, business software, online learning, and medical-reference sites
• AI Mode concentrated citation weight among a smaller group of leading domains

AI Overviews stood apart most. Its leading brand mentions overlapped less with the other three platforms than any other pairing, in every month measured. Its source overlap with ChatGPT was also the lowest.

If your customers use several AI search bots, you need to know which platform holds the gap before spending money to close it.

Who carries the brand when your site doesn't?

The old SEO instinct says start with your own website. AI visibility makes that less reliable.

When your brand appears in an AI answer, the cited sources show where that visibility comes from. If publishers, retailers, community sites, or reference platforms supply most of it, the problem may sit outside your website entirely.

The evidence is blunt. In the U.S., Chevrolet, Disney, Ford, Honda, Marvel, Nintendo, and Toyota all ranked in the top 100 for mentions across all four platforms — and all sat outside the top 500 for citations in every month measured.

That puts some AI visibility work outside SEO's remit. The fix might belong with content, engineering, or communications. As the report puts it, "Create more content" is a weak default when the source gap lies elsewhere.

Why does category matter as much as platform?

Even within the U.S., broad benchmarks can mislead. Semrush found that differences between categories exceeded differences between platforms on mention-to-citation overlap, in every month measured.

In Real Estate, the same four source domains — Apartments.com, Realtor.com, Redfin, and Zillow — appeared across all four platforms every month. U.S. Industrial had no equivalent recurring source core. A real estate team can start from a stable set of sources; an industrial team needs sharper competitor and customer questions before a category benchmark tells them anything.

The practical playbook from the report: build separate mention and citation baselines for a fixed set of customer questions, inspect the answers and cited pages, then fund the tactic. Keep business outcomes separate from visibility measures — Semrush's study does not establish that a visibility change caused a commercial result.

Diagnose the type of gap first, then hand the work to the team that can actually fix it. The full report is available from Semrush, registration required.