GEO vs SEO vs AEO: What Actually Changed in 2026

Two years ago, "GEO" was an academic paper. Now it is a line item on agency invoices, a category of startups and a source of a lot of confusion. Is it a new discipline? A rebrand of SEO? Something you need to hire for?

The honest answer, based on what Google itself published in 2026 and the larger studies from the past year: GEO and AEO are mostly SEO with a different scoreboard. The fundamentals did not change. What changed is where people see your brand, how few of them click, and which signals matter most for being named in an AI answer.

This post explains the three terms, what the data shows, and what to actually do.

The definitions

SEO (search engine optimization) is getting your pages to rank in search results so people click through to your site.

AEO (answer engine optimization) is getting your content used as the direct answer: featured snippets, voice answers, and now AI-generated answers. The term predates ChatGPT.

GEO (generative engine optimization) is getting your brand mentioned and your pages cited in answers from generative AI: ChatGPT, Perplexity, Gemini, Claude, Google's AI Overviews and AI Mode. The term comes from a 2023 Princeton paper that tested how rewriting content changes its visibility in AI answers.

In practice AEO and GEO are used almost interchangeably. Both measure success as "were we in the answer?" instead of "did we rank and get the click?"

	SEO	AEO / GEO
Goal	Rank and earn the click	Be cited or named in the answer
Where	Ten blue links	AI Overviews, AI Mode, ChatGPT, Perplexity, Gemini, Claude
Main metric	Rankings, clicks, organic traffic	Citations, brand mentions, share of answers
Strongest signals	Relevance, links, content quality	Content quality, plus mentions of your brand across the web
Measurement	Mature (Search Console, rank trackers)	Young, noisy, tools disagree

What changed in 2025 and 2026

Fewer people click

Every serious study finds the same direction:

• Ahrefs measured that when an AI Overview appears, the click-through rate of the number one result is 58% lower (December 2025 vs December 2023). Its first study in April 2025 found 34.5%. (Ahrefs, February 2026)
• Pew Research tracked real users and found they clicked a result on 8% of searches with an AI summary, against 15% without one. Only 1% clicked a link inside the summary. (Pew, July 2025)
• Seer Interactive found organic CTR on queries with an AI Overview fell from 3.19% to 1.31% during 2025, then partly recovered to 2.36% in early 2026. (Seer, April 2026)

And the reach is enormous. At I/O in May 2026, Google said AI Overviews reach more than 2.5 billion people a month and AI Mode passed 1 billion monthly users.

Being cited recovers some of the loss

The same Seer study found brands cited inside the AI Overview got about 120% more clicks per impression than brands that were not cited. That is still fewer clicks than a query with no AI Overview at all, but it is the difference between a bad quarter and a terrible one.

This is the real argument for GEO: on queries where AI answers appear, being the cited source is the only way to keep meaningful traffic.

Mentions now matter more than links

Ahrefs studied 10,000 US brands across 260 million prompts in AI Overviews, AI Mode and ChatGPT. Every type of brand mention correlated strongly with AI visibility. The strongest was mentions in Reddit threads that rank in Google (0.75), followed by mentions on other websites (0.70), news (0.67), YouTube (0.64) and TikTok (0.60). (Ahrefs, November 2026)

An earlier Ahrefs study of 75,000 brands found branded web mentions correlated far more with AI Overview visibility (0.664) than backlinks did (0.218).

These are correlations, not proof. Big brands get mentioned more and also show up in AI answers more. But the pattern is consistent: what other people say about you is weighted heavily in AI answers. For classic SEO, links were the proxy for reputation. For AI answers, being talked about is.

ChatGPT is not just "Bing with a chat box"

An often-repeated tip is "rank on Bing and you'll show up in ChatGPT." The newer data does not back that up. Profound found ChatGPT's citation overlap with Bing fell from 26% to 8% in 2025, while its overlap with Google rose. Ahrefs found only about 8% of ChatGPT citations rank in either engine's top 10.

ChatGPT also searches less than people assume. In an Ahrefs study of 66.6 million responses from August and September 2026, only 14.4% triggered web searches at all. When it did search, "2026" appeared in 22.9% of the queries, and words like "official", "price" and "review" were rising. (Ahrefs, October 2026)

What Google says about GEO

In May 2026 Google published its own guide, Optimizing your website for generative AI features on Google Search. It is blunt. The key lines:

• Optimizing for generative AI search is "still SEO".
• You do not need new machine-readable files, AI text files or special markup. Google Search does not use llms.txt.
• "There's no requirement to break your content into tiny pieces for AI."
• Structured data "isn't required for generative AI search", though it still helps rich results.
• Seeking inauthentic "mentions" across the web "isn't as helpful as it might seem".
• Creating separate pages for every query variation the AI might search for, to manipulate rankings or AI answers, violates the scaled content abuse spam policy.

Google also added generative AI reports to Search Console in June 2026, showing impressions in AI features. They show impressions only, not clicks or citations.

Evidence vs hype

Here is how common GEO advice holds up against the evidence we could find.

Tactic	Verdict	Why
Original data, first-hand experience, things only you know	Works	Google's guide stresses it. AI answers increasingly cite official and research sources over aggregators.
Getting your brand mentioned on Reddit, YouTube, review sites, news	Works (correlational)	Mentions correlate 0.60 to 0.75 with AI visibility in Ahrefs' 2026 data.
Clear facts on your own site: pricing, specs, comparisons	Likely works	ChatGPT's searches skew toward "official", "price" and "review".
Keeping content fresh with real updates	Likely works	Ahrefs found AI-cited pages are on average 25.7% fresher than organic results. Changing only the date is untested.
Adding statistics, quotes and cited sources	Some evidence	The Princeton paper found 30 to 40% visibility gains in a lab setting with a 2023 model. Not independently replicated.
"Chunking" and answer-first passages	Unproven	No controlled study. Google says it is not required. Still good for readers.
llms.txt	Hype	Ahrefs logs from 137,000 domains: 97% of llms.txt files got zero requests in May 2026.
AI-specific schema	Hype	Google says no special markup is needed.
A page for every AI query variant	Risky	Google calls it scaled content abuse.

What to do: a plan for a small team

You do not need a separate GEO team or a new agency. You need to shift some of your SEO effort from "more pages" to "more reasons for people and AI to mention you".

1. Keep the SEO basics

AI Overviews and AI Mode are built on Google's index, and other engines retrieve from the web too. Pages that are crawlable, fast, well-structured and genuinely helpful are still the price of entry.

2. Publish facts only you can publish

Pricing, plan limits, integrations, honest comparisons with competitors, real customer numbers, data from your own product. When an AI answer needs "what does X cost?" or "X vs Y", it looks for an official source. Make sure yours exists and is current.

3. Get talked about where AI engines look

This is the biggest shift. Reddit, YouTube, LinkedIn, review sites and niche communities are among the most cited sources in AI answers. In Ahrefs' November 2026 data, Reddit is the second most cited domain in Google's AI Overviews (18.1% of top-domain citations) after YouTube (24.5%).

The way to earn those mentions is not to manufacture them. It is to show up in the conversations that already exist: people asking for recommendations, comparing tools, complaining about a competitor. Answer them well, disclose who you are, and you become part of the source material AI engines quote. Our Reddit lead generation playbook covers how to do this without getting banned, and how to get cited by ChatGPT and AI Overviews goes deeper on the AI side.

4. Update what matters

Refresh your top pages when something real changes: new pricing, new features, new data. AI engines favor fresher content, and "2026" shows up in a large share of ChatGPT's searches.

5. Measure with humility

• Check the generative AI report in Search Console for impressions.
• Ask "how did you hear about us?" at signup. AI referrals are often logged as direct traffic.
• Track AI referral traffic in analytics (chatgpt.com, perplexity.ai, gemini.google.com and similar). Expect it to be small: benchmarks put it between 0.2% and about 1% of sessions in 2025 and 2026, though it often converts better than average.
• If you use an AI visibility tracker, watch the trend rather than the absolute number. Trackers disagree with each other, sometimes wildly.

FAQ

Is GEO replacing SEO?

No. Google's own guidance calls optimizing for AI search "still SEO", and AI Overviews and AI Mode are built on Google's index. GEO adds a focus on brand mentions and citations, but it rests on the same foundation.

What is the difference between GEO and AEO?

AEO (answer engine optimization) is the older term, originally about featured snippets and voice answers. GEO (generative engine optimization) comes from 2023 research on AI-generated answers. Today both mean the same thing in practice: being cited in AI answers.

Do I need llms.txt for GEO?

There is no evidence it helps. Google says it does not use it, and server logs from 137,000 domains showed 97% of llms.txt files received zero requests in May 2026. It does no harm, but don't expect results from it.

What is the most important GEO factor in 2026?

Based on current data, being mentioned by others: on Reddit, YouTube, review sites, news and other websites. Ahrefs found these mentions correlate more strongly with AI visibility than backlinks do. Original, factual content on your own site comes a close second.

How do I know if I'm being cited by AI?

Use the generative AI report in Google Search Console for impressions, check AI referral traffic in your analytics, ask new signups where they heard about you, and use an AI visibility tracker for prompts that matter to you. No single method is complete.

Find the conversations AI engines quoteProspy watches Reddit, YouTube, LinkedIn and 9 more sources for your topics.