Pfizer vs Merck
Pfizer leads Merck by 11.5 points on the Fameproof index, and wins 1 of the three models. Measured across 96 prompts per model per week.
Pfizer
Pharmaceuticals
54.5/100
Rank 32 on the companies board
Merck
Pharmaceuticals
43.0/100
Rank 43 on the companies board
Pfizer
Per-model score
Merck
—
Claude
—
39.0
ChatGPT
43.0
70.0
Gemini
43.0
30-day movement
0.0
Change
+2.0
Last 7 runs
Answer quality
undefined%
Claude mention rate
undefined%
34%
ChatGPT mention rate
35%
72%
Gemini mention rate
40%
undefined%
Claude prominence
undefined%
21%
ChatGPT prominence
19%
56%
Gemini prominence
17%
Questions about this comparison
Who do AI models mention more, Pfizer or Merck?
Pfizer. It scores 54.5 on the Fameproof index against 43.0 for Merck — a lead of 11.5 points, measured across ChatGPT and Gemini in the run of 5 October 2026.
How is the Pfizer vs Merck 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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