Costco vs Walmart
Walmart leads Costco by 6.0 points on the Fameproof index, and wins 2 of the three models. Measured across 96 prompts per model per week.
Costco
Retail
77.0/100
Rank 13 on the companies board
Walmart
Retail
83.0/100
Rank 6 on the companies board
Costco
Per-model score
Walmart
—
Claude
—
79.0
ChatGPT
83.0
75.0
Gemini
83.0
30-day movement
+0.5
Change
+2.5
Last 7 runs
Answer quality
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Claude mention rate
undefined%
83%
ChatGPT mention rate
82%
81%
Gemini mention rate
84%
undefined%
Claude prominence
undefined%
66%
ChatGPT prominence
81%
58%
Gemini prominence
79%
Questions about this comparison
Who do AI models mention more, Costco or Walmart?
Walmart. It scores 83.0 on the Fameproof index against 77.0 for Costco — a lead of 6.0 points, measured across ChatGPT and Gemini in the run of 5 October 2026.
How is the Costco vs Walmart comparison measured?
Both are asked about with the same panel of category questions — never questions naming them — repeated on every model each week. The score combines how often each is named, how early in the answer, how much of the topic is covered and how consistent the result is.
Both are ranked on the Company AI Visibility board. Prominence reflects how early in an answer the model names them; mention rate is how often it names them at all. How the score is built.
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