AEO vs GEO vs LLMO vs AIO: Five Names, One Practice

AEO, GEO, LLMO, and AIO — plus the catch-all "AI SEO" — are five names for one practice: structuring content so AI answer engines can retrieve, extract, and cite it. The acronym you meet says more about who is writing than about what they do. This page maps where each term came from, what each one emphasizes, and how to choose without pretending the choice changes the work.

Are AEO, GEO, LLMO, and AIO actually the same thing?

Functionally, yes. Strip the labels off any serious guide to AEO, GEO, LLMO, or AI SEO and you find the same task list: answer questions directly, keep passages self-contained, back claims with sources and numbers, serve crawlable HTML, and measure citations instead of only rankings.

The test we apply is simple: does the acronym change a single deliverable? Line the serious guides' task lists up side by side and it does not — a page optimized "for AEO" and a page optimized "for GEO" are the same page. The distinction with actual substance is GEO vs SEO, where the target surface genuinely differs; between these four names, only the audience differs.

Where did each term come from?

Each name has a traceable origin and a tribe that favors it. The map, as of August 2026:

GEO is the only one with an academic anchor: the paper that coined it also built the first benchmark and reported up to 40% visibility gains from adding citations, quotations, and statistics (arXiv, November 2023). Wikipedia's entry sits under "generative engine optimization" and treats the other names as synonyms — a reasonable proxy for where general usage is settling.

AEO's history deserves a line of respect: optimizing for answer surfaces predates the generative wave. Practitioners who did featured-snippet and People-Also-Ask work in the late 2010s will recognize nearly all of today's checklist, which is itself evidence that the discipline is older than any of its current names.

Does the name change the work?

No — and the strongest evidence is that the biggest platform uses none of them. Google's guide to optimizing for generative AI features and its May 2025 recommendations talk about "AI features" and "AI experiences," and the advice inside is search fundamentals: helpful people-first content, crawlable pages, good structure. If the acronyms carried distinct methodologies, the platform documentation would be where the distinction showed up. It does not.

Vendor land tells the same story in reverse. Tools and agencies pick the acronym that positions them best — LLMO sounds technical, AEO sounds established, GEO sounds current — and attach the same checklist to each. That is fine as branding. It becomes a problem when a pitch treats the acronyms as separate line items, or when "AIO strategy" quietly means optimizing for Google's AI Overviews while sounding like something broader.

"AI SEO" deserves its own caution. In press coverage it is an umbrella for everything on this page, but in sales contexts it often means something narrower — using AI tools to produce SEO content faster. Those are different purchases: one is about being cited by answer engines, the other about production efficiency. A proposal that blends the two without noticing has not thought carefully about either.

Which term should you use?

Use the term your audience already uses, define it on first mention, and stay consistent. Consistency is not just editorial hygiene: repeating one stable term alongside plain-language equivalents is what lets an answer engine attach a definition to an entity and quote it cleanly. That is why this library says "generative engine optimization — GEO" once per page and then sticks to GEO.

Our choices, for what they are worth: GEO as the primary term because research and press converged on it; "AI answer engines" for the platforms, because it stays accurate as products rename themselves. When writing for a marketing audience that searches AEO, we use AEO and link it to the same definitions — the approach behind what is answer engine optimization.

What should you do when a vendor leads with an acronym?

Ask what changes operationally, because the honest answer is usually "nothing." A useful screen, whichever name is on the deck: ask which deliverables would differ if the acronym were swapped for another one, ask what evidence backs each tactic, and ask what they will not promise. Anyone promising citations or rankings under any of these labels is promising a system they do not control — no one controls answer-engine output.

And against our own interest: you do not need to buy anything to resolve a naming question. The definitions on this page plus the tactic catalog in the complete GEO guide cover what the five names share. Spend budget on the work — starting with what GEO is and whether your pages answer their questions in the first place — not on the vocabulary.