AI & TechnologyAEO vs GEO vs SEO: What Each One Changes (2026)

SEO, AEO and GEO are three names for getting found: SEO in search results, AEO in direct answers, and GEO in answers written by AI tools like ChatGPT, Perplexity and Google's AI Overviews. Google defines the last two plainly: "'AEO' stands for 'answer engine optimization' and 'GEO' for 'generative engine optimization'." It then says that, from its point of view, optimizing for generative AI search "is optimizing for the search experience, and thus still SEO."

So the useful question isn't which acronym to buy. It's what actually changes on your site when the reader might be an AI tool. The facts below come from Google, OpenAI, Perplexity, Anthropic and Bing's own documentation and from the research paper that named GEO, and I re-read each source on October 20, 2026. Where I draw a line between the terms, that is my framing, not an official definition.

What stays the same: the SEO foundation

Google says its AI features "are rooted in our core Search ranking and quality systems." To appear in AI Overviews or AI Mode, Google says "a page must be indexed and eligible to be shown in Google Search with a snippet," and "There are no additional technical requirements." It also says "there's no special schema.org markup you need to add."

That means the old checklist still carries most of the weight:

• Pages can be crawled and indexed, and robots.txt, your host or your CDN doesn't block Googlebot.
• Important content is in the page text, not only in images or behind a login.
• Each page answers a real question well. Google calls this "non-commodity content", meaning something more than the same tips every other site repeats.

Google also warns against the shortcut of churning out a page for every variation of a question. Doing that mainly to manipulate rankings or AI answers "violates Google's scaled content abuse spam policy".

What changes with AEO: answers, not just links

People often use AEO to mean direct answers: a featured snippet, a voice assistant reply, or the one passage an AI tool quotes. In practice it means writing so a single passage can stand on its own:

• Put the direct answer in the first sentence or two under each heading.
• Use the words people actually ask with, then give the detail.
• Keep facts specific: a price, a limit, a date, a named source.

None of this needs special markup. It's good writing that happens to be easy to quote.

What changes with GEO: AI tools and their crawlers

GEO was named in a 2023 research paper by researchers from Princeton and other institutions, who introduced it as a way "to aid content creators in improving their content visibility in generative engine responses." Two things are genuinely new compared with classic SEO.

1. Each AI search tool has its own crawler, separate from training. This is the part that is easy to get wrong:

OpenAI says "Sites that are opted out of OAI-SearchBot will not be shown in ChatGPT search answers." Google says Google-Extended "does not impact a site's inclusion in Google Search nor is it used as a ranking signal in Google Search." A blanket "block all AI bots" setting at your host can quietly take you out of AI answers.

2. What gets quoted. The GEO paper tested ways of rewriting pages and found that adding sources, quotations and statistics "achieved a relative improvement of 30-40%" on one of its visibility measures, and that "Keyword Stuffing", the old SEO habit, didn't help. Its headline result is that GEO "can boost visibility by up to 40%". That was measured in 2023 on the authors' own test setup with older models, so treat it as a sign of what helps, not a promise.

What changes in measurement

For the first time you can see AI citations in official tools:

• Google Search Console has a generative AI performance report, which Google names in its AI optimization guide.
• Bing Webmaster Tools has AI Performance, which Bing describes as "an early step toward Generative Engine Optimization (GEO) tooling" and which shows how often your content is cited in AI answers.

Run your buyers' real questions through ChatGPT and Perplexity too, and record who gets cited. Those tools don't publish a report for site owners.

What to ignore

Google's guide lists tactics it says don't help in Google Search, including "chunking" content and "creating unnecessary AI text files (like llms.txt)". It also says "many suggested 'hacks' aren't effective," and warns: "Be wary of third-party tools that promise ranking success or claim to use 'internal' Google metrics." I cover llms.txt in its own guide, because it does have a narrower use.

So which one do you need?

All three, but mostly SEO done well:

1. SEO: make sure your important pages are indexed, fast and genuinely useful.
2. AEO: put a clear answer at the top of each section and back it with specifics.
3. GEO: allow the AI search crawlers, add sources and real numbers people can quote, and measure citations in Search Console and Bing.

If you want the step-by-step for AI tools, read how to get your SaaS cited by ChatGPT and Perplexity and the complete GEO guide.

Need a hand?

If you'd rather have it checked for you, see SEO, GEO and AEO services. The AI Search Visibility Audit is a $750 fixed price: I run your buyers' questions through ChatGPT, Perplexity, Google AI Overviews and Gemini, record who gets cited, and rank the fixes. Or send me a short description.