What is the difference between SEO, AEO, and GEO?

SEO (search engine optimization) improves where a page ranks in traditional search results. AEO (answer engine optimization) structures content so search features and assistants can quote it as a direct answer. GEO (generative engine optimization) improves how often and how accurately generative AI tools such as ChatGPT, Perplexity, and Gemini mention and recommend a brand.

Does SEO still matter if buyers use ChatGPT?

Yes. AI answer engines draw heavily on pages that already rank and earn links, so strong SEO remains the foundation. AEO and GEO add layers on top: clear answer-first writing, consistent positioning, and third-party mentions.

How do you measure GEO?

Build a fixed list of buyer questions, run them through the major AI engines on a schedule, and record whether your brand appears, how it is described, which sources are cited, and how competitors show up. Track share of answers and accuracy over time.

Do I need llms.txt or special schema for AI search?

Not for Google Search. Google's 2026 guide on generative AI features says Google Search does not use llms.txt files, that structured data is not required for AI features, and that there is no special AI-only schema. Clear writing, consistent positioning, and earned mentions matter more.

How long does AEO and GEO take to show results?

Clearer pages can be picked up once search engines recrawl and reindex them. Changes in how generative engines describe a brand usually take longer, because they depend on new third-party mentions and on how often the engines refresh their sources.

SEO, AEO, GEO: When Your Buyer Asks a Machine First

At Reuters, we had a rule for every story: the reader should be able to stop after the first paragraph and still know what happened. Editors called it the inverted pyramid. I called it survival, because traders read the first line and moved on.

Twelve years later, that rule is the most important idea in search. Your buyer now asks a machine first, and the machine reads like a trader. It wants the answer up front, in plain words, from a source it trusts.

Welcome to the three-letter alphabet soup of 2026: SEO, AEO, and GEO. Here is what each one means and what to do about it this quarter.

What is SEO?

Search engine optimization (SEO) is the practice of improving where your pages rank in traditional search results. It is the foundation. Pages that rank well, load fast, and earn links from credible sites are also the pages AI engines read most often. At a decision science firm I worked with, repositioning the website around buyer journeys delivered 150% organic traffic growth and page-one rankings for more than 20 high-intent keywords. That base made everything else possible.

What is AEO?

Answer engine optimization (AEO) is the practice of structuring content so search features and AI assistants can quote it directly as an answer. Think featured snippets, Google AI Overviews, and voice assistants. In practice, AEO means answering a question clearly and early, under a heading that matches how people ask it. Google's 2026 guidance on generative AI features describes AEO and GEO as SEO for AI search, so treat all three as layers on one foundation. I led the first AEO strategy at that same firm, and it changed how every writer on the team built a page.

What is GEO?

Generative engine optimization (GEO) is the practice of improving how often and how accurately generative AI tools mention and recommend your brand. When a buyer asks ChatGPT, Perplexity, or Gemini for "the best invoice automation tools for manufacturers," GEO decides whether your name appears in the shortlist and what the machine says next to it.

The three side by side

	SEO	AEO	GEO
The prize	A ranking	A quoted answer	A mention and recommendation
Where it shows up	Search results	Snippets, AI Overviews, assistants	ChatGPT, Perplexity, Gemini, Copilot
What it rewards	Relevance, links, speed	Clear, answer-first writing	Clear positioning, brand mentions, citations
How you measure it	Rankings, clicks	Snippet and overview presence	Share of answers, accuracy

Six moves that get you into the answer

1. Build your prompt set

Write down the 30 to 50 questions your buyers ask before they buy. Use their words: "How do manufacturers stop paying suppliers late?" Run every question through ChatGPT, Perplexity, Gemini, and Google. Save the answers with the date. This is your baseline, and you will repeat it every month.

2. Write answer-first pages

Put the question in the heading. Put a complete, quotable answer in the first two sentences. Add the depth below. Every essay on this site follows that pattern, including the FAQ at the bottom of this one.

3. Keep structured data tidy

Schema markup describes what a page contains: an organization, a person, an article, a product. Google says structured data is not required for its AI features and that there is no special AI-only schema, and it retired FAQ rich results in May 2026. Treat schema as basic hygiene that supports rich results, and put your real effort into the next three moves.

4. Make your entity consistent

AI engines build a picture of your brand from every source they read. If your website calls you a "payments platform," your LinkedIn says "fintech consultancy," and your G2 profile says "software studio," the machine averages the confusion. Pick one description and use it everywhere.

5. Earn the mentions machines trust

Generative engines lean on consensus. They repeat what credible third parties say: industry publications, analyst reports, podcasts, conference coverage, and active communities. In Ahrefs' study of about 75,000 brands, branded web mentions correlated with Google AI Overview visibility at 0.664, compared with 0.218 for backlinks. Google adds that manufactured mentions do little, so earn them. Each executive interview, analyst briefing, and guest essay is now a GEO asset.

6. Measure monthly and correct fast

Every month I check how Google AI, ChatGPT, and Perplexity describe the brands I work on. When an answer is outdated or wrong, the fix usually lives in one of three places: a page that needs a clearer definition, a profile that needs updating, or a topic where competitors have more third-party coverage.

Why I am building a GEO scanner

Running this check by hand is slow, which is why most teams do it once and forget. So I am vibe coding a GEO scanner that runs a brand's prompt set across the major engines and tracks visibility over time. I will share the build, the bugs, and the first results here in public.

The machines are reading. Make sure they read the right story.

Stay on deadline,

Derek