The three acronyms at a glance
All three appeared in the last few years, once AI systems started answering a query with a written answer instead of a list of blue links. They describe the same task from slightly different angles.
| Acronym | Stands for | Angle | German market |
|---|---|---|---|
| GEO | Generative Engine Optimization | Being named in generative answers: ChatGPT, Perplexity, Google AI Overviews, Copilot | the established term |
| AEO | Answer Engine Optimization | Being named wherever search answers directly, including featured snippets and voice assistants | common in English, taken by customs in German |
| LLMO | Large Language Model Optimization | Looks at the language model itself rather than the search surface in front of it | rare, mostly in trade writing |
The gap between them is small enough that agencies use them interchangeably. The question underneath is identical in all three cases: does the machine say your name when someone asks for what you do?
Where AEO collides
„AEO" has meant something else for years, and it still does: Authorised Economic Operator, the customs status granted to companies with audited supply chains. It comes with AEO certificates, AEO authorisations and the AEO-C and AEO-S tiers. In German-speaking markets that meaning dominates the term outright, and the same collision exists in English wherever trade and logistics are in the room.
This is the same kind of naming collision we diagnose in audits for businesses whose name is ambiguous, one level up: here the technical term itself collides.
What we measured
On 3 September 2026 we queried the Google and Bing suggestion endpoints for the German market with the region pinned (hl=de&gl=DE and market=de-DE) and counted what came back. These lists show which phrases people actually type. They do not show how often, which needs a paid data source. A guessed number would sit here looking like a measurement.
| Query | Bing | What comes back | |
|---|---|---|---|
| geo optimierung | 10 | 12 | website, bedeutung, ki, texte, agentur, wordpress, berlin |
| aeo optimierung | 1 | 6 | Google returns the query itself, Bing suggests „seo optimierung" first |
| geo agentur | 9 | 12 | hannover, köln, stuttgart, berlin, münchen, wien |
| aeo agentur | 3 | 1 | zürich, „agentura", and on Bing simply „seo agentur" |
| aeo | 10 | 12 | aeon, AEO certificate, AEO authorisation, AEO customs |
Two things stand out. For „aeo optimierung" Google returns nothing but the query itself, and Bing leads with „seo optimierung", treating the input as a typo. And the completions for „aeo" on its own run straight into customs law.
At the same time these completions genuinely exist: „geo seo unterschied", „geo seo aeo", „aeo seo geo", „was ist aeo und geo", „was ist aeo im marketing" and „answer engine optimization vs geo". People are asking about the difference, and they have heard both terms.
Do they differ in practice?
In the work itself they converge. Call it GEO, AEO or LLMO, it comes down to the same four levers.
- Access. AI crawlers such as GPTBot and PerplexityBot need permission to read your site, and the page has to make sense without heavy JavaScript. A clean llms.txt and a Content-Signal line state your intent unambiguously.
- Structure. One clear H1, sensible headings and structured data that state your service, location and opening hours without ambiguity.
- Content. Short, concrete passages that answer a real question directly. A plain „open Monday to Friday, 9am to 5pm" gets quoted far more often than „flexible hours to suit your needs".
- Reputation. Reviews and listings in the directories your trade actually uses. What others say about you away from your own site carries weight.
If someone offers you AEO as a separate service alongside GEO, they are billing the same work twice. Ask which concrete steps differ between the two packages.
Which term to use
For the German market GEO is the workable choice: the suggestion indexes know it, it has a tail of real follow-up questions, and it collides with nothing. In English-language trade writing you will meet AEO regularly, and it means the same thing there.
For your own website copy the usual advice applies: write the words your customers use. For local businesses a phrase like „get found in ChatGPT" usually carries further than any of the three acronyms. The acronym belongs in the explainer, everyday language belongs on the service page.
What you actually work on
That settles the terminology, and the real work starts after it. These four articles walk through it in order:
- Check whether AI recommends you today, with real queries rather than guesses.
- The four levers in detail, meaning what makes ChatGPT and Perplexity say your name.
- Set up llms.txt and Content-Signal, the two files that record your intent towards AI crawlers.
- Understand Google AI Overviews, the largest AI channel and the hardest one to measure.
Common questions
Is AEO different from GEO?
In practice it is the same work. GEO stresses the generative answers of ChatGPT, Perplexity and Google AI Overviews; AEO stresses any form of direct answer, including featured snippets and voice assistants. The measures behind them overlap completely.
Why does „AEO" return customs pages?
Because AEO has long stood for Authorised Economic Operator, the customs status for companies with audited supply chains. The completions for „aeo" lead to certificates, authorisations and customs tiers accordingly.
What about LLMO?
Large Language Model Optimization. The term looks at the language model itself rather than the search surface in front of it. It shows up mostly in trade writing and describes the same levers.
Which term should I use in my own copy?
GEO, when you need an acronym. On service pages for local customers an everyday phrase works better, something like „so ChatGPT recommends your business".