Share of Model
Definition
Share of model is how often a brand appears in answers from a specific AI system relative to competitors on a fixed prompt set.
By Vinespire Editorial Team, Editorial ·
This term is part of the full AI search glossary.
Full definition
Where share of voice may aggregate several engines, share of model isolates one product—ChatGPT, Claude, Perplexity, Gemini, and so on. Teams compute the fraction of runs or prompts in which the brand is mentioned, recommended, or cited within that model’s outputs.
Because sampling, temperature, tools, and product versions change results, share of model is an estimate from a prompt battery, not a census of all user chats. Report model name, date range, and trial count with every figure.
Model-level splits reveal where GEO work is succeeding or failing across answer surfaces. See Share of Voice, Answer Share, Prompt Battery, and AI Visibility.