Share of Model (SoM)
The percentage of AI-generated answers that mention your brand versus competitors — the foundational AI search visibility metric.
Plain Language Definition
Share of Model measures the percentage of times your brand is recommended by AI search tools compared to all your competitors within a defined query set. It is the AI-era equivalent of search engine market share — but measured across AI response outputs rather than click rankings. SoM is the foundational competitive visibility metric for AI search.
Technical Definition
Probabilistic brand visibility metric representing the percentage of brand mentions or citations earned across a standardized query panel — calculated as (brand mention count) / (total mentions across all competitor brands) — serving as the primary competitive AI share benchmarking measure.
Why This Matters for AI Search Visibility
Without SoM measurement, you do not know whether your AI optimization efforts are working relative to competitors. A brand that appears in 30% of AI answers while a competitor appears in 60% is losing the AI discovery channel significantly. SoM quantifies that gap and tracks your progress closing it.