AI citation gap
An AI citation gap is the difference between how often AI assistants cite your content in relevant answers and how often they cite your competitors'. If ChatGPT or Perplexity answers your category's buying questions with links to rival sites and none to yours, you have a citation gap.
The gap matters because AI answers have far fewer slots than a search results page. A grounded answer typically cites a handful of sources rather than ten links, so the sources that are selected carry disproportionate weight. When a buyer asks an assistant to compare options, the brands whose pages and coverage get cited are effectively the shortlist, and everyone else is absent from the conversation.
Citation gaps usually have identifiable causes. Your pages may not be retrievable at all, because crawlers are blocked or the content sits behind scripts that retrieval systems do not render. Your content may be retrievable but not answer-shaped, so a competitor's clearer page wins the slot. Or your third-party footprint may be thin: engines frequently cite review sites, comparison articles and industry publications rather than vendor pages, and if those sources do not mention you, there is little for the engine to cite. None of the engines publishes its selection criteria, so these patterns come from observation and can shift.
Measuring the gap is unglamorous but straightforward: take the questions your buyers actually ask, run them across the assistants that matter to you, and record which domains get cited. Closing it is slower work. Publish pages that answer those questions directly, and earn mentions in the third-party sources the engines already draw on, because you cannot cite your way in with vendor content alone.