Pfizer vs Merck
Pfizer leads Merck by 7.5 points on the Fameproof index, and wins 2 of the three models. Measured across 96 prompts per model per week.
Pfizer
Pharmaceuticals
53.0/100
Rank 36 on the companies board
Merck
Pharmaceuticals
45.5/100
Rank 43 on the companies board
Pfizer
Per-model score
Merck
—
Claude
—
57.0
ChatGPT
46.0
49.0
Gemini
45.0
Answer quality
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Claude mention rate
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55%
ChatGPT mention rate
43%
44%
Gemini mention rate
41%
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Claude prominence
undefined%
38%
ChatGPT prominence
21%
28%
Gemini prominence
20%
Questions about this comparison
Who do AI models mention more, Pfizer or Merck?
Pfizer. It scores 53.0 on the Fameproof index against 45.5 for Merck — a lead of 7.5 points, measured across ChatGPT and Gemini in the run of 5 August 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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