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AI Visibility Glossary

Share of Model

Answer-first: Share of Model quantifies how prominently your brand appears in AI-generated answers compared to competitors. This generative-era metric tracks the frequency and position of recommendations within outputs from engines like ChatGPT or Perplexity, serving as the modern equivalent to traditional Share of Voice in search.

Last updated: 2026-07-14 · Definition · by Italo Campilii
Definition

Share of Model quantifies a brand’s visibility in AI-generated answers relative to competitors. It measures how often and how prominently an AI engine recommends your brand versus rivals for a defined set of prompts.

What is share of model?

As buyers ask AI assistants for recommendations instead of scrolling search results, being mentioned inside the answer becomes the new shelf space. Acromatico benchmarks your brand against rivals, identifies citation gaps, and helps close them.

How do you calculate share of model?

Answer-first: Share of Model is calculated by dividing weighted brand mentions by total eligible mentions, then multiplying by 100. This requires a documented prompt set, specific model versions, dates, and strict rules for prominence weighting to ensure accuracy.

Because AI models update frequently and outputs vary by phrasing, share of model is a comparative metric. It reflects visibility for specific prompts at a specific time, not a fixed market share. Documentation of the prompt set and model versions is essential for accuracy.

Related terms

AI Share of VoiceAI VisibilityCitation Gap

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