"How Differently Do ChatGPT, Gemini, and Perplexity Cite? Same Question, Three Engines Pick Completely Different Sources"

The AI Platform Citation Source Index released by Yext / 5W in May 2026, a study spanning 680 million AI citations, shows that the citation logic of ChatGPT, Gemini, and Perplexity differs far more than most assume — only 11% of cited domains are cited by more than one engine simultaneously. This article breaks down what each of the three prefers, and how GEO strategy should be allocated.