Share of Model: The Metric That Replaces Domain Authority in 2026
Domain Authority is dead. Not because Moz said so, but because the metric was built for a world where humans clicked through ten blue links. That world is gone. In its place, a new measurement has emerged: Share of Model, the probability that an AI recommends your brand when a user asks a relevant question. What Is Share of Model? Share of Model (SoM) is the percentage of times your brand appears in AI-generated responses across a set of representative queries for your category. Unlike Domain Authority, which estimates your likelihood of ranking on Google, Share of Model directly measures whether AI systems like ChatGPT, Perplexity, Gemini, and Claude mention you when potential customers ask questions you should be answering. ...