Amazon vs Costco
Amazon leads Costco by 3.0 points on the Fameproof index, and wins 1 of the three models. Measured across 96 prompts per model per week.
Amazon
E-commerce
80.0/100
Rank 10 on the companies board
Costco
Retail
77.0/100
Rank 13 on the companies board
Amazon
Per-model score
Costco
—
Claude
—
75.0
ChatGPT
79.0
85.0
Gemini
75.0
30-day movement
+0.5
Change
+0.5
Last 7 runs
Answer quality
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Claude mention rate
undefined%
76%
ChatGPT mention rate
83%
88%
Gemini mention rate
81%
undefined%
Claude prominence
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68%
ChatGPT prominence
66%
79%
Gemini prominence
58%
Questions about this comparison
Who do AI models mention more, Amazon or Costco?
Amazon. It scores 80.0 on the Fameproof index against 77.0 for Costco — a lead of 3.0 points, measured across ChatGPT and Gemini in the run of 5 October 2026.
How is the Amazon vs Costco 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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