American Express vs Mastercard
Mastercard leads American Express by 21.0 points on the Fameproof index, and wins 2 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?
Mastercard. It scores 63.5 on the Fameproof index against 42.5 for American Express — a lead of 21.0 points, measured across ChatGPT and Gemini in the run of 5 October 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.
Check my company