GEO glossary

LLM visibility

LLM visibility is how often, how prominently and how accurately a brand appears in answers from large language model tools such as ChatGPT, Claude, Gemini and Perplexity. It covers mentions, citations, recommendations and the facts an assistant states about the brand.

Reviewed by Gareth Hoyle, Managing Director
Last reviewed 31 October 2026

Where does LLM visibility come from?

An assistant can know about a brand in two ways. The first is training data: what the model learned from the web before its cut-off date. The second is retrieval: pages it searches and reads at the moment it answers. Training data shapes what the model says when it does not search. Retrieval decides which pages are cited when it does.

Crawler access controls the retrieval route. OpenAI says sites that opt out of OAI-SearchBot will not be shown in ChatGPT search answers, while its separate GPTBot crawler covers model training. Google says its Google-Extended token controls use of content for training future Gemini models and for grounding, and does not affect inclusion or ranking in Google Search.

Is LLM visibility the same as SEO visibility?

No. Ahrefs found in August 2025 that only 12% of URLs cited by AI assistants ranked in Google's top 10 for the same prompt. A brand can rank well and be absent from AI answers, or rank modestly and be cited often.

How to measure it

Track a fixed set of prompts across the assistants your buyers use, run each several times, and record mention rate, citation rate, share of voice and accuracy. Check accuracy on its own: outdated prices, discontinued products and wrong locations are the errors to look for, and they are fixed at the source pages. Report each platform separately, because one brand can score very differently on each.

Example

A UK fashion retailer could rank on page one of Google for 'women's linen trousers' and still appear in few ChatGPT answers to 'where can I buy good linen trousers in the UK'. Our UK fashion AI visibility index compares 59 retailers on this measure.