Generative engine optimization (GEO) is the work of making your pages more likely to be used, named and linked when an AI system writes an answer: ChatGPT search, Perplexity, Google's AI Overviews and AI Mode. The term comes from a 2023 research paper, not from Google or OpenAI. For a business, it adds a short list of checks on top of ordinary SEO. It does not replace it.
People are searching for the term. Google's Keyword Planner reports about 4,400 US searches a month for "generative engine optimization". Many of the pages answering that search are selling a package, so this guide starts with the source.
Where did the term GEO come from?
GEO was named in GEO: Generative Engine Optimization, a paper by Pranjal Aggarwal and five co-authors, with Princeton University and IIT Delhi among their affiliations, first posted to arXiv in November 2023 and accepted to the KDD 2024 conference. The authors call systems that retrieve web pages and then write an answer from them "generative engines", and they asked a practical question: if a page is already among the sources an engine has pulled, can rewriting the page change how much of the answer comes from it?
To test that, they built a benchmark of 10,000 queries called GEO-bench, applied a set of rewriting methods to source pages, and measured each page's share of the generated answer. The abstract reports that the methods can boost visibility by up to 40%. The three that did best were adding quotations, adding statistics and citing sources. Keyword stuffing, the old search habit, gave little to no improvement, and in the authors' test on Perplexity it did worse than leaving the page alone.
Two limits matter before anyone turns that into a sales pitch. First, the experiment starts with the page already retrieved. It says nothing about how to get into the set of sources in the first place. Second, a 2026 survey of the research since found the paper's gains valid within its experimental setting, and concluded that no reviewed technique shows a stable, longitudinal, cross-platform causal effect on being discovered or on what customers do next.
What is the GEO strategy in SEO?
GEO is the last step of an SEO strategy, applied to pages a search system can already find. The three terms you will hear describe one job seen from three surfaces.
SEO (search engine optimization)
Where the customer sees you
A list of results in Google or Bing, including the map pack
What you are competing for
A position on the page and the click
AEO (answer engine optimization)
Where the customer sees you
A direct answer: a featured snippet, a voice reply, an AI answer
What you are competing for
Being the answer that gets lifted
GEO (generative engine optimization)
Where the customer sees you
An AI-written answer that blends several sources
What you are competing for
Being one of the sources used, named and linked
We treat AEO and GEO as the same practice. Our longer piece on answer engine optimization goes through what the evidence supports tactic by tactic, so this guide does not repeat it. The short version: the engine reads on your customer's behalf, and it can only quote what it was able to retrieve.
Is GEO replacing SEO?
No. Google's AI features and ChatGPT search both retrieve pages through a search step before they write anything, so a page that search cannot find has no way into the answer. Google's documentation on AI features and your website says there are no additional requirements to appear in AI Overviews or AI Mode and no other special optimizations necessary. A page has to be indexed and eligible to be shown in Google Search with a snippet.
ChatGPT works the same way from a different index. OpenAI's help page on searching the web with ChatGPT says that to make a website eligible for inclusion, you allow its OAI-SearchBot crawler to reach the site, and that placement is not guaranteed.
So the order of work does not change. A roofing company whose service pages are not indexed, or a law firm whose site blocks crawlers at the firewall, has a search problem. Calling it a GEO problem changes the invoice, not the fix.
What does GEO add that SEO does not already cover?
Three things, and none of them is special code.
- Crawler access for AI search bots. A site can rank in Google and still be closed to OpenAI's or Perplexity's search crawlers through robots.txt, a host setting or a CDN rule. OpenAI's crawler documentation separates OAI-SearchBot (search) from GPTBot (model training) and says each setting is independent, so you can allow one and refuse the other.
- Answers that stand on their own. A generated answer lifts a sentence or two. A page that states the answer plainly near the top, with the specific fact attached, is easier to lift than one that builds up to it. This is where the GEO paper's findings on quotations, statistics and cited sources apply.
- What other sites say about you. An engine answering "best pest control company in Tampa" can draw on directories, review sites and local press as well as company websites. Being described accurately in those places is part of the job, and a website alone cannot do it.
Do you need schema markup or an llms.txt file for GEO?
No. Schema markup is good housekeeping and it is not a way into AI answers. Google's AI features page says you do not need to create new machine readable files, AI text files or markup, and that there is no special schema.org structured data to add.
The measured evidence agrees. Ahrefs tracked 1,885 pages that added schema between August 2025 and March 2026 against control pages, and found no major uplift in citations on Google AI Overviews, AI Mode or ChatGPT. Keep your schema accurate because it helps ordinary search results display your business correctly. Do not pay for it as a GEO lever.
Why is GEO harder to measure than SEO?
Because an AI answer is not a fixed ranking. Ask the same question twice and you can get different businesses and different sources. Ahrefs followed more than 43,000 keywords and found that AI Overviews change about every two days, and that 45.5% of the cited sources are new from one response to the next. A single check is a snapshot. It is not a finding.
There is a second trap. Being named and being cited are different things. An engine can recommend your company in the text with no link to your site, or link to your page without naming you. When Ahrefs tracked its own brand across six AI assistants, the mention came with a link about 28% of the time. A report that blends the two into one "AI visibility score" hides which one you have.
Honest GEO measurement has four parts: the engines are named, the questions are fixed and written the way a customer would ask them, each question is run several times on different days, and mentions are counted separately from citations. Then it is compared with what the business cares about, which is calls and enquiries. Our guide to measuring AI-search enquiries covers that last step.
What should a business actually do about GEO?
Do the search work first, then add the short GEO list. In order:
- Confirm you can be found. Check that your main service pages are indexed in Google and Bing, and that robots.txt, your host and your CDN are not blocking AI search crawlers. If pages are missing, start with pages not indexed.
- Answer the questions buyers ask, on the page for that service. What it costs and what changes the price, which areas you cover, how fast you can come out, what license or accreditation you hold. Put the answer in the first sentence under the question.
- Add the specifics only you have. Named staff credentials, your own job counts or turnaround times, a quoted line from a manufacturer's spec or a regulator. These are the quotations, statistics and sources the GEO research found useful, and they also help the human reader decide.
- Check how the rest of the web describes you. Directory listings, review profiles, trade association pages and local press should carry the same name, services and location as your site.
- Measure with repeats, then look at enquiries. Fix a list of buyer questions, run them on named engines across several days, and record mentions and citations separately.
If you want the how-to for one engine, see how to get your business recommended by ChatGPT. If your business is missing from AI answers and you do not know why, this diagnostic guide separates the possible causes. And if you are comparing providers, read how to choose an AI SEO agency before you sign anything.
What can nobody promise you?
Inclusion. OpenAI says placement is not guaranteed, Google says there is no special optimization, and the research has not shown a tactic that reliably moves customers across engines. What can be done is to remove the reasons an engine would skip you and make your pages the easiest accurate source to use. That is how we scope AI-search optimization: access, pages, corroboration and repeated measurement, with no promised placements.
To see where your own site stands, ask for a free site check. We send one useful finding within two business days, and no call is required.
Common questions
Is GEO the same as AEO?
In practice, yes. Answer engine optimization and generative engine optimization describe the same work: making a page easy for an AI system to retrieve, quote and credit. GEO is the term from the 2023 research paper by Aggarwal and colleagues. AEO is the label more agencies sell under. A provider who treats them as two separate services should explain what differs.
Does GEO replace SEO?
No. Generative engines retrieve pages through search before they write anything. Google states there are no additional requirements for its AI features beyond being indexed and eligible for a snippet. If a page cannot be found in ordinary search, GEO work on that page has nothing to act on.
Do I need an llms.txt file?
No. Google's documentation says you do not need new machine readable files or AI text files to appear in its AI features. What matters is whether search crawlers, including OpenAI's OAI-SearchBot, can reach your pages. Check robots.txt and your CDN settings before adding any new file.
Is GEO worth it for a local service business?
The access checks and clear service pages are worth doing because they help ordinary search too. A large standalone GEO retainer is harder to justify until repeated checks show customers in your trade and city are getting AI answers that name businesses. Start by running your own buyer questions several times and reading what comes back.
Can an agency guarantee my business appears in ChatGPT?
No. OpenAI's own help page says placement in ChatGPT search is not guaranteed, and answers change from one run to the next. An agency can make your site eligible, improve the pages and report repeated measurements. A guaranteed placement is a red flag, not a feature.