Original research · Powered by Sourceable
A quarterly study of how AI assistants talk about brands — who gets mentioned, who gets misdescribed, and who gets cited — measured across four LLM engines from Sourceable’s continuous production monitoring. First edition: Q3 2026.
(01)What it measures
Buying research is moving into AI assistants, and brands have no scoreboard for it. The Index publishes one — built on the measurement framework from our AI-visibility methodology, applied at industry scale.
Of the prompts a real buyer would ask in a category, the share in which a brand appears at all. The baseline metric — and for most brands, the humbling one.
When a brand is mentioned, are the facts right? Services, locations, pricing, and claims are scored against ground truth to quantify hallucination rates.
How the answer positions the brand — leading option, niche alternative, or cautionary tale — tracked as a distribution, not a single verdict.
When engines cite sources, whose pages get quoted. The metric that separates brands AI knows about from brands AI sends traffic to.
(02)Methodology
Stratified panels of buyer-realistic prompts per industry — category discovery, comparisons, problem-first questions — frozen across editions so movement is signal, not rephrasing.
Every prompt runs against ChatGPT, Claude, Perplexity, and Gemini through Sourceable’s production monitoring agents — the same infrastructure our customers use.
Model answers are probabilistic, so every prompt is sampled repeatedly per engine per period. Published numbers are aggregates with variance, never single runs.
Published findings are industry-level aggregates. No customer’s individual monitoring data is disclosed — the Index reports the water, not the fish.
(03)First edition · Q3 2026
We publish findings only once the panels have enough samples to stand behind — aggregates with variance, methodology attached, and no cherry-picking. Until then, this page states what is coming rather than inventing numbers to fill it.
Want it when it lands?
Request the report