Ai-Search

AI Visibility Metrics: Formulas, Benchmarks & Sample Sizes (2026)

Every AI visibility number is a sample estimate, not a census. This reference defines 7 metrics (Citation Share, Time-to-First-Citation, Co-citation Rate, Fanout Uniqueness, Inline Hyperlink Share, Shopping Trigger Rate, Rank Stability) with formulas, 2026 benchmarks, and the sample sizes you need before a difference means anything.

Why the Same Page Gets Cited 18% on ChatGPT and 0% on Perplexity: The Citation Asymmetry Problem

The same page can be a top citation on ChatGPT and invisible on Perplexity. AI visibility isn't one number. Engines rewrite prompts differently, weight sources differently, and disagree on hostnames 65 to 85% of the time. Here's why, and what to do about it.