Answer engine optimization (AEO): what actually works, and what nobody has proven yet

Someone has probably told you your business needs answer engine optimization, or AEO, so that ChatGPT and Google’s AI answers name you instead of a competitor. I went through those claims one at a time against Google’s own documentation and the peer-reviewed research, because I sell this work and I need to know which parts I can defend in a room. Some of it holds. The tactic sold hardest of all turns out to be one Google has explicitly ruled out. If you are a step earlier than this and still weighing whether AI search is worth doing anything about, start there.

What is answer engine optimization (AEO)?

Answer engine optimization, or AEO, is making your page the clean, correct, self-contained answer to a real question, so an answer engine like ChatGPT, Perplexity, or Google’s AI Overviews can lift it and credit you. Generative engine optimization (GEO) and “AI SEO” are the same idea under different names.

The names multiplied faster than the practice did. Strip the labels away and the job is old: be the most useful, most trustworthy answer to a question a real person is asking. What changed is who reads it first. A model now sits between your page and your buyer. It reads on their behalf and decides who gets quoted.

Is AEO different from SEO?

Mostly no. AI answers are assembled from the same search index, so a page has to be findable in ordinary search before an answer engine can use it. AEO is the last mile of SEO, not a replacement for it.

This is the part the packages tend to skip, because it is harder to sell. Google’s own documentation is explicit that its AI features draw from the same index that powers normal search, and that a page has to be indexed and eligible to appear in ordinary results before it can show up in an AI Overview at all. If Google cannot retrieve your page, no amount of AEO styling puts you in the answer. The foundation is still technical SEO: a page an engine can crawl, read, and index.

Do I need special code, schema, or an llms.txt file?

No. Google states that structured data is not required for its generative AI features, that there is no special markup that makes a page eligible, and that AI-specific files will neither help nor hurt your visibility.

Schema markup is still worth adding, because it helps human search results and keeps your facts machine-readable. But it is not an AEO cheat code, and anyone selling you a schema package as the way into AI search is selling you something Google has already said does not work that way. The same goes for the “add this file and ChatGPT will cite you” advice. It is not how retrieval works.

What actually makes an AI cite your page?

Whether your page is genuinely the relevant answer, and whether it was among the sources the system already retrieved. A factorial experiment across six models and 252,000 trials found relevance and retrieval position are the primary determinants of the first citation.

The model can only quote from the handful of pages it pulled to answer the question, and within that set it favours whichever one most directly answers what was asked. Ordinary retrieval settles both of those before a single writing tactic comes into play, which is why the last-mile advice matters only once you are already in the set.

Does the way you write change anything?

Yes, but only once your page is already in the running. Adding direct quotations, statistics, and cited sources raised citation odds by 41, 33, and 30 percent in the KDD 2024 experiment. Keyword stuffing was the only tested tactic that backfired, at about minus 8 percent.

This is the closest thing the field has to a proven, on-page method, and it is worth doing because it also makes the page better for the human reader. The tactic SEO folklore still leans on, cramming keywords, was the one thing tested that measurably hurt.

How do you show up in ChatGPT and Google AI Overviews specifically?

Be indexed and eligible in Google, let the AI crawlers reach your pages, and be the clearest answer on the page. There is no separate lever that ranks you inside ChatGPT beyond being a retrievable, trustworthy source.

Two practical checks sit under that. First, make sure the content is in the HTML the crawler receives rather than painted in later by JavaScript. A page that looks full in a browser can arrive empty to a bot, and nothing on screen tells you it happened. Second, confirm you are letting the relevant crawlers in. OpenAI, Perplexity, and Google publish which bots fetch pages for their AI features (GPTBot, PerplexityBot, Google-Extended among them); if your robots rules block them, you have opted out of the answer.

Will AEO actually bring you more customers?

Nobody has proven that it does. The 2026 academic survey of the field found no reviewed technique with a stable, cross-platform causal effect on discoverability or on downstream clicks and conversions.

So what should you actually do?

Build the page that answers your buyer’s question, make sure engines can reach it, and treat AEO as the last thing you do rather than the first. The boring version is the only one with evidence behind it.

We did the ordinary version of this for JS Wallmatrix, an interior-finishing supplier. We were the first developers to touch the site and the first to set up any measurement on it, so there was no meaningful before. Keyword research told us which pages buyers were already searching for, and we built those. In roughly five months from a standing start, the site produced more than 80 qualified inbound inquiries covering about 6,500 square metres of quoted work, and a third of the leads that arrived through a product page came in on the long-tail pages that existed only because the research said to build them.

None of that was AEO work. There was no schema package and no llms.txt file. We picked the questions buyers were already typing and answered them properly. Months later I ran a buyer search in their category and Google’s AI Overview came back citing their pages by name. I had not optimised for it and I could not have promised it in advance. That is the shape of this work: you can earn the conditions for a citation, and you cannot order one.