SEO vs GEO: what's the difference, and do you have to choose?

In 2026, when you search for something online, two scenarios play out: you type your query into Google and click a link, or you ask ChatGPT, Perplexity, or Gemini a question and get a directly generated answer. Both behaviours coexist — and optimising for them requires different approaches.

SEO (Search Engine Optimization) has been around since the 1990s. GEO (Generative Engine Optimization) emerged with the democratisation of LLMs (Large Language Models) in 2022–2023. Understanding the difference between the two is understanding how online search actually works today.

What is SEO?

You probably already know SEO. It's the set of practices that help a website appear in the results of Google (and other traditional search engines). Three pillars:

• Content: well-written pages, properly structured, targeting the keywords users search for
• Technical: a fast, crawlable, technically well-built site
• Authority: quality backlinks that pass credibility in the engine's eyes

The final goal of SEO: generating a click. The user searches, Google displays results, the user clicks your link, they arrive on your site.

To learn more about the basics, read our article what is SEO.

What is GEO?

GEO covers the optimisation practices that get your content cited, quoted, or recommended by AI answer engines: ChatGPT, Perplexity, Gemini, Claude, and the next engines that will emerge.

When a user asks Perplexity "who is the best SEO consultant in Brive-la-Gaillarde?", Perplexity doesn't show a list of links. It generates an answer directly, drawing on sources it has scraped. To be cited in that answer, you need to optimise differently than for classic SEO.

The goal of GEO: being cited. Not necessarily generating a click. Being the reference source the AI uses to build its response.

SEO vs GEO comparison table

Criterion	Classic SEO	GEO
Target engine	Google, Bing	ChatGPT, Perplexity, Gemini, Claude
Goal	Click from SERP	Citation in an AI response
Key factor	Backlinks + content	Fact density + topical authority
Measurement	Position + CTR + traffic	LLM mentions, brand awareness
Result timeline	3–6 months	6–12 months (less data available)
Main risk	Google penalty	Hallucinations or attribution errors
Maturity	Very mature (30 years)	Emerging (2–3 years)

The real differences in practice

1. Fact density

For SEO, a well-structured 1500-word article is often sufficient. For GEO, every paragraph should contain at least one precise, verifiable fact. LLMs rely on information density to assess the credibility of a source.

Vague text like "SEO is important for your online visibility" will never be cited by an LLM. Text that says "according to an Ahrefs 2024 study, the top 3 Google results capture 54% of clicks" has a much better chance of being picked up.

2. Topical consistency

For SEO, you can rank well on varied topics if you target the right keywords. For GEO, LLMs strongly favour specialisation. A site that exclusively covers SEO will be perceived as more credible on the topic than a generalist site, even if individual articles on the generalist site are technically better.

3. Semantic structure

Both disciplines value good structure (H2, H3, lists). But GEO goes further: structured FAQs (with explicit questions and concise answers) are particularly well absorbed by LLMs, which are looking for direct answers to questions.

4. Presence in reference sources

LLMs are trained on data corpora including Wikipedia, Reddit, media sites, and specialist forums. Being cited, mentioned, or linked from these sources increases the probability of being included in the model's knowledge. It's a form of link building, but for the AI era.

5. Query intent

SEO is particularly effective on commercial and transactional queries ("buy", "price", "best"). GEO matters more for informational and discovery queries ("how", "what is", "explain me"). Users who want to buy still click. Those who want to understand ask an AI.

Do you have to choose between SEO and GEO?

No. They're two complementary levers addressing different behaviours.

Start with SEO if you don't yet have a content strategy. SEO generates measurable traffic, leads, revenue. Its ROI has been proven and documented for decades. The foundations of SEO (quality content, clean technical setup, relevant backlinks) also indirectly serve GEO.

Add GEO once your SEO is stable. In practice, solid GEO optimisation requires:

• Fact- and statistic-dense content
• Structured FAQs on every strategic page
• Coherent, deep topical coverage
• Presence in sources LLMs use (specialist press, Wikipedia where relevant, forums, podcasts)

The trap would be sacrificing one for the other. Companies that abandoned their SEO to "bet everything on GEO" have often lost Google traffic without gaining proportional AI visibility — because both disciplines share fundamentals.

A concrete example: SEO consultant in Brive

Take a practical example. I'm an SEO and GEO consultant based in Brive-la-Gaillarde, France. Here's how I approach both levers for my own visibility:

SEO: I have a consultant SEO Brive page optimised for the local query, with clear localisation signals (address, service area, LocalBusiness structured data). That's what generates clicks from Google Maps and local results.

GEO: I publish factual, specialised content (like this article) that deeply covers topics where I want to be recognised as a reference. If someone asks an LLM "what is GEO in SEO?", I want my definition and examples to be among the cited sources.

The two feed each other: strong SEO authority reinforces the credibility perceived by LLMs, and a solid reputation in the AI ecosystem can generate direct traffic.

How to get started?

For SEO, you can start understanding the mechanics with our free SEO simulator — it confronts you with real ranking decisions without risk.

For GEO, read our complete guide on AI search and GEO, or if you'd prefer personalised support, explore my GEO consultant services.

And if you want an analysis of your current situation — SEO and GEO — feel free to contact me directly. I offer a free 20-minute diagnostic to identify your priorities.

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Written by Alexandre De Sousa, SEO & GEO consultant, founder of iZZi. Last updated: May 2026.