The AI Search Evidence Index, round one: AI visibility guides link a source for a third of their numbers; one publisher ran 6% to 55% ismybrandinai.com

Round one of The AI Search Evidence Index. We sampled 38 AI-visibility pages, retrieved 32 inside one 84-second window, and scored the 13 that carried enough numeric claims to rate. The median page linked a source for 33% of its numbers; pooled, 80 of 252 claim blocks. One publisher’s own pages ran from 6% to 55%, so sourcing is decided per article, not by house style. The full dataset, the coding notes, the instrument’s revision history and the second-coder agreement (Cohen’s kappa = 0.85) are published alongside it.