Most teams treat LLM output as deterministic. We measured 180,000 responses across four AI engines for 18 months and found the opposite: visibility drops 30% overnight, and the engines agree on 11%.
Over 90 days I tracked how six AI search engines cite sources across 50,000+ B2B software responses. The data broke several assumptions the GEO industry treats as settled, starting with the idea that AI visibility is one thing you can optimize for.
Traditional impressions on our properties fell 10-20% this year. AI search visibility rose 35%. That inversion is not a problem to fix; it is the new shape of B2B discovery, and the AI channel brings better-qualified buyers. Here is the data and what it means.
Eighteen vendors all claim to track AI engine visibility in 2026. Their methodologies differ enough that cross-vendor numbers don't compare. Here is how to actually evaluate them.