What is Answer Engine Optimization (AEO)?

Last updated: August 15, 2026

Answer Engine Optimization (AEO) is the work of getting your brand named inside an AI assistant’s answer, rather than ranked on a page of links. It matters because the assistant now writes the recommendation itself — the shopper often never sees a results page at all, so there is nothing to rank in and no click to win.

AEO, GEO — is there a difference?

In practice, no. AEO (Answer Engine Optimization) and GEO (Generative Engine Optimization) are two names for the same work, and people use them interchangeably. GEO is the term used in the academic literature; AEO is more common in marketing. If someone insists on a distinction, it is usually that GEO leans toward the generated-text side and AEO toward featured-answer style results — but nobody is consistent about it and nothing practical hangs on the choice.

How it differs from SEO

SEO competes for a position. AEO competes for a sentence. The practical consequences:

• There is no rank to check. There is only: were you named, or not.
• There is often no click. The shopper gets their answer in the chat, so traffic-based measurement misses the event entirely.
• Your own site is not the main lever. This is the biggest adjustment for anyone coming from SEO — see below.
• Answers vary. Ask twice, get two lists. You are looking at a distribution, not a position.

What carries over is most of the fundamentals. Being crawlable, fast, well-structured and factually clear still helps, because the assistant has to be able to read you.

What the research says actually works

The foundational study here is “GEO: Generative Engine Optimization” (Aggarwal et al., KDD 2024), from Princeton, IIT Delhi, Georgia Tech and the Allen Institute for AI. It tested nine content tactics across roughly 10,000 queries. The three that measurably won:

• Adding statistics — around +41% visibility. Concrete numbers are quotable; vague claims are not.
• Citing your sources — up to +115% for lower-ranked content. This is the single biggest lever available to a site without established authority.
• Adding direct quotations — around +28%.

Overall that same paper found targeted content changes could move AI visibility by roughly 22–41%. Note what is not on the list of things that worked: keyword density, and anything resembling a trick.

The uncomfortable part: most of it is off your site

A 2026 study by Position Digital, which analysed 321 citations across seven B2B SaaS niches, found that about 66%of brand recommendations happened without ChatGPT citing that brand’s website at all. The strongest drivers it identified were presence in third-party listicles, branded mentions across the web, community discussion, and review volume. (321 citations is a modest sample — treat the direction as solid and the exact percentage as indicative.)

Review platforms show the same shape. An analysis of 129,000 domains attributed to SE Ranking, reported here, found domains with profiles across review sites earned 4.6–6.3 citations on average versus 1.8 for domains without them — roughly a threefold difference.

So a complete AEO effort is maybe one-third your own pages and two-thirds being present in the places the assistant reads: the pages it opens before it answers.

What about llms.txt?

Skip it for now. It is a proposed file for telling AI crawlers about your site, and it sounds compelling, but as of 2026 no major AI company reads it in production. Google’s John Mueller compared it to the long-dead keywords meta tag — a self-reported claim about your own site, which is exactly the kind of signal an engine cannot trust. An Ahrefs study of 137,000 sites found 97% of llms.txt files received zero AI requests. It costs little to add, but do not mistake it for progress.

How long does any of this take?

Longer than SEO people expect. Published guidance converges on four to eight weeks between publishing something and seeing it surface in AI answers, and three to six months of consistent presence before recommendation queries name you reliably. Those are practitioner estimates rather than measured findings, so treat them as rough.

One genuinely encouraging measured result, from the same Position Digital study above: pages with no search traffic at all were still cited 11% of the time. Being new is a headwind, not a wall.

A reasonable order of operations

• Measure first. Record where you stand before changing anything, or you will never know what worked — here is how to check.
• Get listed where your category gets reviewed. The threefold citation difference above is the cheapest win available.
• Work the pages AI already reads about your competitors — the citation gaps.
• Then fix your own pages — direct answers up top, real numbers, sources cited.