Semrush AI Visibility Index Shows Why Authority Depends on the Query and Sources

The Semrush AI Visibility Index reveals that authority in AI-generated search results depends on the specific query and the sources cited, rather than just a single domain-level metric. This index analyzes over 126 million AI search prompts across platforms like ChatGPT, Google AI Mode, and Gemini. The key finding is that the brands mentioned in AI answers often do not match the websites cited as sources, indicating a divergence in the ecosystem behind the responses.

While the same brands may be mentioned across platforms, only a small percentage of cited sources overlap, indicating different evidence bases for each system. Citation frequency is not a reliable trust metric, as source diversity varies significantly by platform. For businesses, this means that authority is no longer solely determined by a website's conventional organic ranking.

Instead, it involves understanding which sources shape answers for critical customer questions. A strong owned-content program alone may not control the narrative if independent, accurate, and recent sources are lacking. Businesses should evaluate their source ecosystem by considering the intent behind customer queries, the brands mentioned and cited in AI answers, the variety of source types (owned, editorial, review, retail, etc.), and the consistency of claims across platforms.

This approach moves beyond just domain authority to a more nuanced understanding of how AI search influences visibility and decision-making.