AI Visibility Glossary

Share of Model

2026-07-12 · Definition · by Italo Campilii
Definition

Share of model measures how often and how prominently a brand appears within an AI model's generated answers for a defined set of queries, relative to competitors. It reflects a brand's presence inside the model's outputs, a generative-era parallel to share of voice in traditional media.

As buyers ask AI assistants for recommendations instead of scrolling search results, being mentioned inside the answer becomes the new shelf space. Share of model quantifies that presence: across a category's key prompts, how frequently does an engine name your brand, and does it lead, list you among options, or omit you entirely?

Tracking share of model turns AI visibility into something measurable and improvable. Acromatico benchmarks a brand against rivals across representative prompts, identifies where competitors are cited and you are not, and closes those gaps so your brand earns a larger portion of the answers customers actually see.

Related terms

Questions people ask

How is share of model different from share of voice?

Share of voice measures brand presence across traditional channels like ads, search, and press. Share of model narrows the focus to AI-generated answers, tracking how often and how prominently an engine mentions your brand versus competitors when users ask questions in your category.

How do you measure share of model?

You define a representative set of category prompts, run them across target AI engines, and record how often each brand is named and how prominently. Comparing your mention rate and positioning against competitors produces a share figure you can track and improve over time.

See if AI actually names your brand

Acromatico runs live AI-visibility audits across ChatGPT, Perplexity, Gemini, and Claude.

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