ChatGPT Cites Wikipedia. Perplexity Cites Reddit. Google AI Mode Cites YouTube. Here’s What That Means for Your GEO Strategy.

An analysis of 680 million AI citations published in early 2026 found that only 11% of domains are cited by both ChatGPT and Perplexity. On the same query, these two platforms pull from almost entirely different sources. Google AI Mode adds a third, separate citation pool.