In one sentence
Share of voice in AI is the proportion of answers in a given prompt set where a brand is named, relative to the brands it competes with. It answers the question of who AI recommends in a category, not just whether you appear.
Share of voice is the metric that survives contact with a leadership meeting, because it is relative. A mention rate of 30 percent means little on its own; 30 percent against a leader at 70 percent and a challenger at 12 percent tells you exactly where you stand.
Measure it per topic as well as overall. Most brands discover they hold strong share on branded and bottom-of-funnel prompts and almost none on the category-level questions where new buyers actually start.
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