American Express vs Mastercard
American Express leads Mastercard by 7.0 points on the Fameproof index, and wins 1 of the three models. Measured across 96 prompts per model per week.
Questions about this comparison
Who do AI models mention more, American Express or Mastercard?
American Express. It scores 57.5 on the Fameproof index against 50.5 for Mastercard — a lead of 7.0 points, measured across ChatGPT and Gemini in the run of 5 August 2026.
How is the American Express vs Mastercard 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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