AI Visibility · Explainers · Marketing
AEO vs SEO vs GEO: What Actually Changed
SEO gets you ranked. AEO and GEO get you named in the answer. Here's what each term means, what really changed, and what stayed exactly the same.
SEO is how you rank in a list of search results. AEO (answer engine optimization) is how you become the answer when a search engine or AI assistant responds directly. GEO (generative engine optimization) is the same idea aimed specifically at AI tools like ChatGPT, Perplexity, and Google's AI Mode. In practice AEO and GEO describe the same work. And Google's own position is that all of it is still SEO. They're mostly right, with one important difference: the finish line moved.
If you've talked to an SEO vendor in the last year, you've heard all three acronyms, probably in the same sentence and usually attached to a price. The labels are doing more work in sales decks than they are in practice, and the gap between them is smaller than anyone selling you one of them wants to admit.
So here's what each term actually means, what genuinely changed about getting found, and what's worth doing about it.
The three terms, side by side
| SEO | AEO | GEO | |
|---|---|---|---|
| Stands for | Search engine optimization | Answer engine optimization | Generative engine optimization |
| The goal | Rank high in a list of links | Be the answer given directly | Be named or cited in an AI written response |
| Where it shows up | Google and Bing results pages | Featured snippets, AI Overviews, voice assistants, AI chat | ChatGPT, Perplexity, Gemini, Google AI Mode |
| Who chooses | The searcher scans and clicks | The engine picks one answer | The model picks a few names |
| How you measure it | Rankings, clicks, traffic | Whether you're the answer | How often you're named, and how you're described |
Where the terms came from. SEO is decades old. AEO grew out of featured snippets and voice search, when engines started answering instead of listing. GEO was named in a 2023 research paper, "GEO: Generative Engine Optimization," from researchers at Princeton, Georgia Tech, the Allen Institute for AI, and IIT Delhi. It's the most specific of the three.
Nobody has settled which of these terms is the biggest. Some guides treat GEO as the wide one, with AEO as the narrow business of getting extracted into an answer. Others flip it. Semrush now files both under a third acronym. Google's position is that all of it is still SEO.
When we say AEO, we mean the whole job: being the business the machine names, whether the answer comes from Google or ChatGPT. The label matters less than knowing which outcome you are paying for.
What Google says
Google's guide to generative AI features in Search is blunt: "optimizing for generative AI search is optimizing for the search experience, and thus still SEO." It also says you don't need special AI text files, special markup, content chopped into tiny pieces, or a special writing style to appear in its AI features.
That's useful, because a lot of AI search advice is selling exactly those things. The foundations haven't changed. Useful content, a site search engines can crawl, and real authority still do the heavy lifting.
What actually changed
The foundation is the same. The outcome isn't. Four real shifts:
1. From a list to a shortlist. A results page gave you ten chances, and position four still got clicks. An AI answer names a few companies, sometimes one. There's no page two. You're in the answer or you're not.
2. From your site to your reputation. Rankings leaned heavily on your own pages and the links pointing at them. AI answers lean hard on what other people say about you: reviews, press, customer stories, listings. If your own site is the only source describing you, you're easy to leave out.
3. From keywords to questions. People type fragments into Google. They ask AI tools full questions with context: "What's a good analytics tool for a 30 person SaaS team that already uses HubSpot?" Pages that answer real questions directly get pulled into answers.
4. From rankings to mentions. You can't check your "position" in ChatGPT. You check whether you're named, how often, how you're described, and which sources the answer cites. Answers also vary from one run to the next, so one check tells you very little.
What the research says works
The 2023 GEO paper tested ways of rewriting content and found they could raise visibility in AI generated answers by up to 40%. The approaches that helped were the ones that make content more credible and specific: citing sources, adding statistics, and including quotations. Keyword stuffing, the old SEO shortcut, did not help.
That lines up with what we see in practice. AI tools reward content that is specific, sourced, and easy to quote.
What to do about it
- Keep your SEO foundation. Crawlable pages, fast load times, clear structure, useful content. None of it is optional now.
- Write one specific description of your company and use it everywhere, so every source says the same thing.
- Answer the questions buyers ask, near the top of real pages, in plain language.
- Add proof people can quote: numbers, named customers, sources.
- Earn mentions off your site: reviews, podcasts, press, partner pages.
- Measure mentions, not only rankings. Track whether AI tools name you for the questions that matter, every month.
For how ChatGPT specifically picks which companies to name, see How ChatGPT Decides Which Companies to Recommend.
Frequently asked questions
What is the difference between AEO and SEO?
SEO aims to rank your pages high in a list of search results, where the searcher chooses what to click. AEO aims to make your business the answer an engine or AI assistant gives directly. They share the same foundation, but AEO depends more on direct answers to real questions and on independent sources confirming who you are.
What is the difference between AEO and GEO?
Less than the debate suggests, and the industry does not agree on which is broader. GEO, named in a 2023 research paper, points specifically at generative AI tools like ChatGPT and Perplexity. AEO started with featured snippets and voice answers and now usually covers AI answers too. Some guides call GEO the broader discipline and AEO the answer extraction piece inside it; others say the reverse. The tactics overlap almost entirely, so pick a term, define it where your buyers can see it, and judge the work by whether you get named.
Is SEO dead because of AI search?
No. Google says optimizing for its AI features is still SEO, and AI tools still rely on pages they can crawl and trust. What changed is the outcome: being one of a few names in an answer instead of one of ten links on a page.
Do I need an llms.txt file or special schema for AI search?
Google says no for its AI features: no special AI files, markup, or writing style are required. Clear, useful, crawlable content and a strong reputation across the web matter far more.
How do I measure AEO or GEO?
Track a set of real buyer questions across ChatGPT, Perplexity, Gemini, and Google's AI features. Record whether you're named, how you're described, and which sources get cited. Repeat monthly, since answers vary between runs.
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