Semrush’s “2026 AI Visibility Index” exposes a measurement gap with direct consequences for marketing budgets. Brands appearing in generated answers often differ from the domains supplying supporting material. Combining those positions into one score can send teams toward the wrong intervention. The strategic challenge is distinguishing brand presence from source authority before assigning spend or ownership.
Brand Presence and Source Authority Require Different Responses
Semrush examined 22 categories across four platforms. During each measured month, average overlap between the 100 highest-ranking brands and corresponding cited domains stayed below half.
That repeated separation is the strongest supported finding. It challenges the usefulness of a combined visibility score for deciding where marketing investment belongs.
A brand mention records presence within an answer; a citation identifies a domain used for supporting information. These positions answer different commercial questions. Does the customer encounter the brand, and whose material supports that encounter?
Semrush’s July U.S. results illustrate the distinction through Ford. The brand reached the leading 100 for mentions on each platform. Its domain’s citation rankings were 1,055th on ChatGPT and 1,146th on Gemini. They were 1,320th on AI Mode and 748th on AI Overviews.
For U.S. Finance on ChatGPT, Semrush reported Investing.com seventh for citations and 50th for mentions.
Ford’s case points toward investigating external sources supporting its presence. Investing.com’s position raises a different question: why doesn’t its contribution translate into comparable brand prominence?
Neither example establishes a sales problem. Both show why a shared content prescription could misallocate resources.
Platform and Category Change the Competitive Comparison
A combined score also obscures where competitors gain their advantage. Semrush found Gemini included more distinct brands per response than ChatGPT throughout the measured U.S. period. ChatGPT supplied the most source entries per response, while Gemini supplied the fewest.
Those differences limit the value of treating platform results as interchangeable. A brand’s performance on one service doesn’t establish equivalent positioning elsewhere.
Category differences impose another constraint. Semrush found category variation exceeded platform variation for overlap between mentions and citations during every measured month.
In U.S. Real Estate, Apartments.com, Realtor.com, Redfin, and Zillow recurred as sources across all four services throughout measurement. U.S. Industrial lacked a comparable recurring group.
Real estate marketers therefore have an identifiable source set to examine. Industrial marketers face a less stable category benchmark.
This evidence supports more specific competitive measurement. It does not establish a universal formula for gaining visibility.
Third-Party Evidence Changes Who Owns the Work
Semrush reported Chevrolet, Disney, Ford, Honda, Marvel, Nintendo, and Toyota among the leading 100 mentioned brands across all four platforms. Their domains remained below position 500 for citations throughout the measured period.
That persistent gap makes website-only diagnosis inadequate for these cases. Brand presence can coexist with limited citation of owned material.
For positioning, the practical concern is which external descriptions support the brand’s appearance. Marketing leaders need to examine those pages before deciding whether their own website requires investment.
One useful recommendation is to commission a question-level diagnostic before approving a visibility campaign:
- Record brand appearances separately from citations of the company’s domain.
- Identify external pages supporting answers to the selected customer questions.
- Compare competitors within the same category and platform.
- Assign the diagnosed issue to SEO, content, engineering, or communications.
This gives each team a defined problem rather than a mandate to raise an opaque score.
Persistent Measurement Gaps Do Not Prove Commercial Impact
The repeated findings support a measurement problem, not a proven transformation in customer acquisition. Semrush’s study does not establish that visibility changes caused business results.
The broader pattern may be a separation between brand recognition and the sources systems select. Its commercial significance remains dependent on the questions customers ask and their subsequent behavior.
The case would weaken if a brand’s priority questions showed little separation between appearances and owned-domain citations. A gap confined to peripheral questions would also provide less justification for spending.
Marketing leaders can use separate measures to make better allocation decisions now. Before funding a tactic, establish which position needs improvement and keep commercial outcomes as a separate test of success.
