When someone asks ChatGPT or Perplexity "who's the best plumber in Austin," the AI names a handful of businesses. AEO Share-of-Voice measures how often that named business is *you*.
It's also called AI Answer Share-of-Voice, or AI-SoV for short. Both names mean the same thing: a percentage that captures your visibility inside AI answers.
The plain definition
AI Answer Share-of-Voice is the percentage of category prompts whose AI-assistant answers name your business, relative to all businesses named in those answers, measured per engine and averaged across the engines that actually answered.
Break that down:
- Category prompts are the questions a buyer would actually ask: "best roofer near me," "top-rated dentist in Denver," "who should I hire to fix my AC."
- Named means your business appears, by name, in the answer text.
- Per engine means it's measured separately for ChatGPT, Claude, Perplexity, Gemini, and Google AI Overviews, because they don't agree.
- Averaged across engines that answered means if only two of four engines returned an answer, the score reflects those two, never a silent zero for the ones that didn't respond.
So a 40% AI-SoV means: across the category questions checked, your business was named in about 40% of the answers that mentioned any business.
What it is NOT
This is the part that trips people up. AEO Share-of-Voice is not a score for how good the AI models are. It is not a leaderboard ranking LLMs, like LMSYS Chatbot Arena or the HuggingFace Open LLM Leaderboard. Those rank the *models*. AI-SoV ranks *your visibility inside the answers those models give*. Same-sounding words, opposite thing.
Why it matters
More buyers now ask an AI assistant before they scroll a map or a list of blue links. If the AI answers the question and names three businesses, and you're not one of them, you're invisible at the exact moment someone is ready to buy, and a competitor is getting named instead.
AI-SoV turns "am I showing up in AI?" from a guess into a number you can watch. And because it's built from real answers, it points at the fix: if the AI keeps naming the same three competitors and never you, the gap is usually that there isn't enough clear, consistent, corroborated information about your business for the AI to confidently name you.
How it's measured honestly
A trustworthy AI-SoV number comes with a receipt: the exact prompt asked, which engines answered, the verbatim answer text, and the business names pulled from it, only names that actually appear in the answer, never a guessed or inferred competitor. If you can't inspect the number, it's marketing, not measurement.
Nobody controls what an AI says, so no honest tool guarantees you'll be named. What AI-SoV does is measure where you stand and, tracked over time, show whether the white-hat work is moving the number.