How does PressGEO determine the AI visibility rankings for Boston businesses?

The Boston AI Visibility Index by PressGEO uses a data-driven methodology involving 1,092 recorded AI answers collected over a 90-day rolling window. The November 2026 report analyzed recommendations from five major AI engines—ChatGPT, Perplexity, Gemini, Claude, and Copilot—across 156 local firms in 14 service categories. A firm's ranking is determined by its "mention rate," or the percentage of AI answers in which it appears. Notably, the study found that 61 of the 96 measured Boston-area firms were not named in any AI answers during the measurement period.