Definition
Mention rate is measured per LLM, per prompt set, over time. A brand at 70% mention rate is named in 7 of 10 buyer-intent prompts. Mention rate is the most actionable KPI because every other metric (citation share, sentiment, rank) is downstream of it.
Why it matters
Mention rate sits in the "Measurement" layer of the AI search stack. Teams that handle it well get cited more, recommended more, and earn more of the AI-mediated revenue in their category. Teams that ignore it spend a year wondering why their content investment never moves the needle inside ChatGPT or Perplexity.
Related terms
- Citation share - Percentage of cited sources in an LLM answer that come from your domain. Only meaningful on grounded surfaces (Perplexity, ChatGPT Search, AI Overviews).
- Share of voice (AI) - Your mention rate as a percentage of the total mentions of you plus your named competitors across LLM answers.
- Sentiment (in LLM answers) - The tone with which an LLM describes your brand - positive, neutral, negative - when it does mention you.
- Rank in answer - Where your brand appears in an LLM's ordered recommendation set - first paragraph (best), middle, or final mention (weakest).
Apply it
The LLM SEO playbook ties every concept in this glossary into a single operating model. If you want to see how your brand performs across all the LLMs at once - mention rate, citation share, sentiment, rank - start with the free GEO audit or skip straight to a free Livesov account.