The shift SEO people are scrambling to measure#
For twenty years, search optimisation meant one thing: rank a blue link as high as possible on Google. That model is not dead, but it is no longer the whole game. A growing share of questions now get answered directly by an AI assistant, ChatGPT, Perplexity, Gemini, Claude, Grok, or Google's own AI Mode, often without the user ever clicking through to a website.
That creates a new problem. If an AI assistant recommends three tools in your category and you are not one of them, you have lost the customer before they ever saw your site. There is no "page 2" to climb to. You are either in the answer or you are invisible. The discipline that tries to fix this has a name: Generative Engine Optimization, or GEO.
What GEO actually is#
GEO is the practice of getting your brand and content mentioned and cited in AI-generated answers, rather than ranked in a list of links. The term comes from a 2023 research paper by teams at Princeton, Georgia Tech, IIT Delhi and the Allen Institute for AI, which was the first to study systematically what makes content more likely to be surfaced by generative engines.
Their finding matters because it was measured, not guessed: applying GEO methods improved content visibility in AI answers by up to 40% compared to unoptimised content. The methods that worked were not tricks. They were things like adding verifiable statistics, citing named sources, and writing clear, quotable statements, exactly the kind of content an AI can lift into an answer with confidence.
This is the most important and most reassuring thing about GEO. The research suggests that the way to get cited by AI is, broadly, to produce genuinely useful, factual, well-sourced content. That is the opposite of the spam playbook, and it is good news for anyone who already writes carefully.
Why this is becoming urgent now#
Two trends are pushing GEO from "interesting" to "necessary".
First, AI answers are eating search real estate. Google's AI Overviews now appear in roughly a quarter of all searches, according to Conductor's 2026 AEO/GEO benchmark as compiled in Similarweb's Gen AI stats roundup. When an AI summary sits at the top of the page, the classic blue links below it get fewer clicks. The position-one click-through rate collapses when an AI Overview is present.
Second, people are starting their buying research inside AI tools. Similarweb's 2026 Generative AI Brand Visibility Index found that around 35% of US consumers now use AI at the product-discovery stage. If a third of your potential customers begin with "which tool should I use for X" typed into ChatGPT rather than Google, the answer ChatGPT gives is now a top-of-funnel battleground.
Put those together and the conclusion is uncomfortable but clear: a brand can be doing fine in classic Google rankings and still be losing ground in the place where decisions increasingly start.
How you actually measure AI visibility#
The honest answer is that this is harder than checking your Google rank, because AI answers are non-deterministic. Ask ChatGPT the same question twice and you can get two different sets of recommendations. Answers also differ between engines: the brand Perplexity loves may be absent from Gemini.
That is why a manual "let me just ask ChatGPT and see" approach does not scale. To measure GEO seriously, you need to:
- Define the prompts that matter. The real questions your customers ask AI in your category, not your brand name.
- Run them repeatedly, across engines. A single check is noise. Patterns over time and across ChatGPT, Perplexity, Gemini, Claude, Grok and Google AI Mode are signal.
- Track citations, not just mentions. Being named is good; being the cited source is better, and it tells you which pages the AI trusts.
- Watch competitors. Who shows up instead of you reveals both your gap and the sources worth targeting.
This is exactly the job that a dedicated GEO tool automates. We reviewed one in detail, RankPrompt, which tracks visibility across all six major engines, records which sources each answer cites, and flags the competitors appearing in your category's answers. It is not the only option, and it is not magic, but it turns "are we visible in AI" from a vague worry into a number you can track. On the content side, tools like Frase now score individual articles for how citation-friendly they are.
What to do with the data#
Measurement is only useful if it changes what you do. Once you can see where you stand, the GEO playbook is fairly grounded:
- Strengthen the pages AI already cites in your niche. Citation tracking tells you which sources the engines trust. Get mentioned on those pages, or out-publish them.
- Add verifiable facts and named sources to your own content. This is the single most evidence-backed GEO tactic from the original research.
- Structure content for extraction. Clear definitions, direct answers near the top, and quotable sentences are easier for an AI to lift cleanly.
- Cover the real questions, not just keywords. AI search is conversational, so content that answers a specific question well tends to get cited for it.
None of this is exotic. It is, mostly, good content practice with a new measurement layer on top.
What this post does not cover: this is a primer on GEO and how to measure it, not a step-by-step ranking guarantee. No tool, including the ones linked here, can promise that an AI engine will cite you, because AI answers are probabilistic and change constantly. We do have an affiliate relationship with RankPrompt (disclosed on its guide), and none with the research authors, Conductor or Similarweb. GEO is a young discipline; the figures here were current as of the sources below on the publication date, and the field is moving fast, so treat specific percentages as directional rather than permanent.
Sources#
- Generative Engine Optimization (original research paper, Princeton, Georgia Tech, IIT Delhi, Allen Institute for AI): https://arxiv.org/abs/2311.09735
- Similarweb, What is GEO (2026 guide): https://www.similarweb.com/blog/marketing/geo/what-is-geo/
- Similarweb, Gen AI stats 2026 (AI Overviews share, Conductor benchmark, brand visibility index): https://www.similarweb.com/blog/marketing/geo/gen-ai-stats/
- RankPrompt product and pricing pages (verified June 2026): https://rankprompt.com/
