Costco vs Kirkland Signature: AI Share of Voice Comparison
In the latest Famewise run (data as of 2026-08-17), Costco was named in 12 AI answers and Kirkland Signature in 31, across ChatGPT, Claude and Gemini with web search on and off. Kirkland Signature holds the larger share of voice. They are named together in 2 answers.
| Costco — answers naming it | 12 |
|---|---|
| Kirkland Signature — answers naming it | 31 |
| Share of voice split | Costco 28% / Kirkland Signature 72% |
| Answers naming both | 2 |
| AI models | OpenAI GPT, Anthropic Claude, Google Gemini |
Updated
Relative share of voice
Of the 43 mentions across the two brands, Costco takes 28% and Kirkland Signature 72%. They are named together in 2 answers.
How this is measured
Famewise generates the category-level questions consumers ask AI assistants, then asks them to current OpenAI GPT, Anthropic Claude and Google Gemini models — each question with web search on and off. An extraction model records every brand named in every answer, the position of its first mention, and the sentiment toward it. Brands are ranked by visibility: the share of this category's answers that name them at least once. Share of mentions is a different cut of the same data — each brand's slice of every brand mention in the category. Every number reflects the latest scheduled run.
Read the full methodology — sample sizes, formulas and refresh frequency →
Frequently asked questions
Is Costco or Kirkland Signature more visible in AI answers?
In the latest Famewise run, Costco is named in 12 AI answers and Kirkland Signature in 31. Kirkland Signature has the higher share of voice. The two are named together in 2 answers.
How are Costco and Kirkland Signature measured?
Famewise asks current OpenAI GPT, Anthropic Claude and Google Gemini models the questions consumers ask in these brands' categories — with and without web search — and records every brand each answer names, its position, and the sentiment toward it.
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