Share of model measures how often your brand appears in AI-generated answers for a category, relative to competitors. It’s the AI-era analog of share of voice: instead of your slice of ad impressions or search visibility, it’s your slice of the “mindshare” an AI engine expresses when asked about your space.
How it’s measured
Run a representative set of category queries across the engines you care about, then calculate how frequently and how prominently your brand is named versus competitors. Aggregated across many queries and engines, that gives a share-of-model figure.
Why it matters
AI answers are often a single, synthesized recommendation rather than a list. Being named at all is the contest, so a relative metric (how much of the available “answer space” you own versus rivals) is more meaningful than your visibility in isolation.
Related reading
See share of voice explained for the full metric and how to track it, and compare with share of voice.