Somewhere in the last two years, "get recommended by ChatGPT" acquired at least six competing names. GEO, AEO, LLM SEO, LLMO, AI SEO, GSO — every vendor, agency, and newsletter picked a horse, and now founders googling a straightforward question get a taxonomy fight instead of an answer. Industry coverage keeps noting the same thing: there's no agreed vocabulary yet, just a land grab for whichever acronym wins.
Here's the part that saves you an afternoon: they're all the same discipline. Different coinages, different marketing budgets behind them, one practice underneath. This page defines every term you'll actually encounter, then tells you the one distinction worth your attention — and which word to say out loud in 2026. If you want the how-to rather than the vocabulary, skip straight to our guide on improving your GEO.
The terms
GEO (generative engine optimization)
GEO is the practice of structuring and distributing your content so that generative AI engines — ChatGPT, Perplexity, Gemini, Google's AI Overviews — cite or recommend you in their answers. The term comes from a 2023 academic paper that coined "generative engine" for AI systems that synthesize answers rather than list links, and it has since become the term with the most momentum: it's what most practitioners, newsletters, and tools now say by default. If one acronym ends up winning the war, it's this one.
AEO (answer engine optimization)
AEO is the practice of optimizing content to be selected as the direct answer by answer-giving systems — the same discipline as GEO under an older name. The coinage predates ChatGPT; it originally covered featured snippets and voice assistants, then expanded to cover AI chat. Enterprise marketing vendors tend to prefer it, partly because the term was already in their decks. If someone says AEO, mentally substitute GEO and nothing is lost.
LLM SEO / LLMO
LLM SEO (or LLMO, large language model optimization) means optimizing your content and brand presence for large language models specifically — again, the same practice with the model class in the name. These variants show up mostly in SEO-community writing, where "SEO for LLMs" felt like a natural extension of existing vocabulary. They emphasize an important nuance — models learn about you from training data and retrieval, not just live crawling — but they describe no separate discipline.
AI SEO
AI SEO is the one term to avoid, because it means two opposite things: using AI tools to do traditional SEO, and doing SEO for AI engines. Half the articles under this banner are about drafting meta descriptions with ChatGPT; the other half are about getting cited by it. Nobody who hears "AI SEO" can tell which you mean without a follow-up question, which disqualifies it as a useful label. If you catch yourself typing it, pick a side and use the precise word.
AI search visibility
AI search visibility is the outcome all of these practices chase: how often, and how favorably, AI assistants mention or cite your brand when buyers ask relevant questions. It's the umbrella metric rather than a method — the thing you'd chart, if you charted it. It's also the plain-English phrase that needs no glossary, which makes it the safest choice when you're talking to anyone outside the marketing bubble. With B2B buyers increasingly asking AI before they ask Google, it's the number that quietly becomes your top of funnel.
Honorable mentions: GSO, AIO
GSO (generative search optimization) and AIO (AI optimization) are also-ran coinages for the same practice that never escaped their inventors' blogs. You'll meet them occasionally in vendor pitches. They decode instantly once you know the pattern: someone took the discipline above and tried to trademark a new angle on it. Nod politely and translate to GEO.
The only distinction that matters
The distinction that matters isn't between the acronyms — it's between doing the practice and debating its name. Strip the branding away and every term above describes the same three moves:
- Answer-shaped content. Pages that state the answer plainly, in extractable one-to-three-sentence capsules, instead of burying it under a thousand words of preamble. (Our breakdown of how to get cited by ChatGPT shows what this looks like in practice.)
- Presence in the sources AI reads. Your own crawlable site, plus the third-party places assistants trust — review sites, communities, comparison pages. Different engines lean on different sources; Perplexity has its own habits worth knowing.
- Measurable citations. Actually checking whether the assistants mention you, monthly, and treating that as the scoreboard.
The terminology war, meanwhile, is vendors fighting for category ownership. Whoever gets their acronym adopted gets to be the definitional company in the space — that's why every tool insists its term is the real one. That's a rational fight for them and an irrelevant one for you. You're a founder; don't spend an hour of your life on it. The numbers behind the shift are moving fast either way — we track them in our roundup of AI search statistics for startups.
How it differs from classic SEO
GEO isn't a replacement for SEO — it's the same raw material judged by a different reader. Classic SEO persuades a ranking algorithm to list your link; GEO persuades a language model to repeat your answer. The overlap is large (good structure, real expertise, crawlable pages help both), but the scoreboards differ:
| Classic SEO | GEO / AEO | |
|---|---|---|
| Unit of success | A ranking — position on a results page | A citation — being named inside the answer |
| Who reads the result | A person scanning ten blue links | A person reading one synthesized answer |
| Time to results | Months of accrued authority before movement | Often faster — engines re-fetch sources continuously |
| What wins | Authority, backlinks, keyword targeting | Clarity, extractability, mentions across trusted sources |
| Losing looks like | Page two — visible but unclicked | Absence — the answer simply never mentions you |
The practical consequence: if you already do SEO well, you're most of the way there — but "most of the way" isn't cited. The remaining work is making your answers quotable and your brand present where the models look. That's exactly what our SEO specialist runs for founders who'd rather not add a second discipline to their week.
Which term should you use?
Say GEO when you mean the practice, and AI search visibility when you mean the outcome; those two cover every conversation you'll have in 2026. GEO is the term with the widest current adoption, so it's the one that gets you understood without a glossary — this page notwithstanding. "AI search visibility" is what you put in front of a co-founder or a board, because it names the result rather than the method.
And then stop thinking about vocabulary entirely. The founders winning this channel aren't the ones with the sharpest taxonomy — they're the ones whose pages answer questions cleanly enough to quote. If that's the part you'd rather have handled, start with the full GEO guide; it's the how-to companion to this glossary.