What Actually Makes AI Search Engines Cite Your Website (The Research Data)

Google and ChatGPT don't agree on who deserves to rank. A 2025 Chatoptic study tested 1,000 search queries across 15 brands and found just 62% overlap between Google's first-page results and ChatGPT's cited sources. The correlation coefficient between Google rank and ChatGPT visibility? 0.034 — essentially zero. That means your SEO playbook isn't enough anymore. AI search engines — ChatGPT, Perplexity, Gemini, Google AI Overviews — use fundamentally different ranking signals. And with Bain reporting that 80% of search users now rely on AI summaries at least 40% of the time, this isn't a niche concern. I've spent the last few months digging through every major study on AI search citation behavior. Here's what the data actually says. The biggest study: 129,000 domains analyzed SE Ranking and Search Engine Journal published the most comprehensive analysis of ChatGPT citation patterns to date — 129,000 domains, 216,524 pages, across 20 industry niches. Their key findings: Signal Impact on