---
id: "action-measure-som"
type: "action-item"
source_timestamps: ["§ The Rise of “Share of Model”"]
source_url: "https://hbr.org/2025/06/forget-what-you-know-about-seo-heres-how-to-optimize-your-brand-for-llms"
source_title: "Forget What You Know About Search. Optimize Your Brand for LLMs."
tags: ["analytics", "measurement"]
related: ["concept-share-of-model", "framework-three-prong-ai-perception"]
action: "Measure your brand's Share of Model (SOM) across multiple LLMs using scaled prompting."
outcome: "A clear baseline of AI awareness and identification of the Human-AI awareness gap."
sources: ["geo"]
sourceVaultSlug: "hbr-seg-geo"
originDay: 3
articleStem: "hbr-ext-10-optimize-brand-for-llms"
sourceUrl: "https://hbr.org/2025/06/forget-what-you-know-about-seo-heres-how-to-optimize-your-brand-for-llms"
sourceTitle: "Forget What You Know About Search. Optimize Your Brand for LLMs."
---
# Measure Share of Model (SOM) across multiple LLMs

**Action:** Implement **prompting at scale** to determine your brand's [[concept-mention-rate|mention rate]], sentiment, and perceived strengths/weaknesses across major LLMs (ChatGPT, Gemini, Perplexity, Llama) to establish a baseline AI-awareness metric — operationalizing the [[framework-three-prong-ai-perception|Three-Prong Lens]] to compute your [[concept-share-of-model-d10|Share of Model]].

**Expected outcome:** A clear baseline of AI awareness and identification of the [[concept-human-ai-awareness-gap|Human-AI Awareness Gap]].

**Enrichment / how to do it well:** Measure **per model, not as a single blended score** (visibility in one model says little about another), pick specific 'battlegrounds' relevant to your category, and derive figures from **many prompts and regenerations** because generation is stochastic. Treat outputs as **directional trends**, and re-measure across model versions (GPT-4 vs GPT-4o, Gemini Pro vs Flash, Claude 3 vs 3.5) since each update can shift SOM — see [[question-som-volatility]]. Longitudinal dashboards (e.g., Shareofmodel.ai) help manage volatility.


## Related across articles
- [[action-conduct-prompt-audit]]
- [[action-monitor-agent-ecosystems]]
- [[concept-generative-listening-systems]]