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Published August 3, 2026

Robyn Ungar
Executive Vice President, Health & Wellness

Share of Model

Share of Model
Share:

Share of Model is the post-Citation-Share metric — tracking a brand's presence and prominence across multiple large language models simultaneously. Citation Share measures within a single engine (ChatGPT, Claude, Perplexity, etc.). Share of Model measures across all major engines at once, providing a consolidated view of AI visibility.

Calculation: A brand appears in answers from ChatGPT (12% citation share), Claude (14%), Perplexity (10%), Gemini (9%), and Google AI Overviews (11%). The combined average — Share of Model — is 11.2%. This is the headline metric for board-level AI Communications reporting: "Our share of model is 11.2% across all major engines, up from 8.7% last quarter."

Share of Model smooths out single-engine volatility. A product launch might spike a brand's ChatGPT citations but not move Perplexity; measuring only ChatGPT creates noise. Share of Model captures the consolidated trend. It also flags uneven distribution: if a brand owns 18% of Perplexity but only 6% of Claude, Share of Model will reveal skew that demands investigation.

In strategy and measurement, Share of Model is the executive summary. Citation Share by engine is the detail layer. A strong AI Communications program targets consistency across all five major engines rather than concentration in one. Share of Model is how you report that balance to stakeholders and track progress toward multi-engine dominance.

Robyn Ungar

Written by

Robyn Ungar

Robyn Ungar has more than twenty-three years of senior public relations and communications experience and is a highly regarded marketing specialist and brand strategist. She has been a key communications campaign creator for many blockbuster consumer health & wellness lifestyle brands, integrating marketing, sales, and corporate brand strategies. Robyn has developed and executed strong strategic and holistic brand platforms weaving traditional media, social and digital media, top-tier influencers, and professional and celebrity experts on behalf of clients. Robyn has been instrumental in creating and managing campaigns for global blockbuster brands including Ocean Spray, TB12, Monistat, e.p.t., Ortho Tri-Cyclen Lo, Retin-A-Micro, Renova, OrthoNeutrogena Dermatologics, WeightWatchers, Natrelle Breast Implants - Allergan Aesthetics, Lansinoh, Viactiv, Earth's Best, Talkspace, NOCD, Paxil-CR, Anacin, Imitrex, Newton Living, and more. As a strategic brand specialist, Robyn ensures "The Big Picture" always includes an insightful and consistent approach to press placements, both product, expert, and general feature storytelling moments. In addition to ensuring brands have an integrated communications platform achieving impactful conversions via target audience saturation across multimedia channels. All to drive quality engagement, awareness, and uptake of a company / brand. Robyn is constantly looking for new ways to build brand reputation and recognition in a strategic and streamlined approach, always staying ahead of the competition, and looking out for the brand's bottom line, while differentiating in the category and industry at large. Her long-term brand partners, celebrity, press, and influencer relationships, in addition to her business acumen, have created much success for her clients internationally.

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