SEO vs. GEO: what's the difference for B2B?

For twenty years, being found online meant one thing: ranking on Google. SEO was the whole game. That is changing. A growing share of the research a buyer used to do by clicking through search results now happens inside an AI answer, where a tool reads the web and hands back a synthesized response, often without the buyer ever visiting a site.

GEO, generative engine optimization, is the discipline that grew up around that shift. It is not a replacement for SEO; it is a second layer on top of it. The confusion comes from treating the two as rivals when they answer different questions: SEO asks “will my page rank?”, GEO asks “will the AI mention me when it answers?”

Here is how they compare, where they overlap more than people assume, and how to decide where your effort should go.

At a glance

What SEO optimizes for

SEO is the practice of earning a high organic ranking on a search engine. The prize is a position on the results page, and through it, a click. The mechanics are well understood after two decades: relevant content built around what people search for, links from other reputable sites, and a technically sound site a crawler can read.

It still matters, and it is not going anywhere. Most buying journeys still pass through a search engine, and a page that ranks well is a page that gets found. SEO is the foundation, the table stakes of being visible online.

What GEO optimizes for

GEO optimizes for a different outcome: being the source an AI tool quotes and credits when it answers a question. The prize is not a ranked link but a mention inside the generated answer, and increasingly the buyer never clicks through at all, because the AI already told them what they needed.

The academic work that formalized GEO measured visibility gains of up to 40% in AI-generated answers from a specific set of tactics: adding citations, quotable statistics, and clearly stated claims to a page ^[1]. It pairs closely with answer engine optimization (getting your content extracted as the answer) and leans on the same machine-readable signals as structured data.

The same question, in two places

Picture a buyer asking, “who makes precision aluminum enclosures for medical devices?” On Google they get a page of links and click two or three, so your site has a shot if it ranks. In ChatGPT or a Google AI Overview they get a short written answer that names two or three companies and moves on. If you are not in that written answer, you are invisible to that buyer, even if you would have ranked fourth on the old results page.

That is the whole difference in one scene. SEO is a competition to be a link worth clicking; GEO is a competition to be a name worth mentioning. The same underlying question, asked in two places, rewards two different kinds of preparation.

Where they overlap (more than you'd think)

The rivalry is overstated because the two share a foundation. AI tools do not read the whole web from scratch for every question; they lean heavily on search indexes to find and rank the sources they then cite. Google itself documents how its AI features select and link the pages they draw from ^[2]. A page that ranks well is a page an AI is more likely to find and quote.

So the groundwork is common to both: a site that is crawlable, fast, clearly structured, and genuinely authoritative. Do that badly and you lose on both fronts at once; do it well and you have earned the right to compete for the ranking and the citation. (Wondering where your site stands? The Alkali Score benchmarks it against 55,000+ B2B sites and sends you the first fix we'd make.)

Where they genuinely diverge

The split is in what each rewards on top of that foundation. SEO rewards comprehensiveness and keyword coverage; GEO rewards extractability, a claim stated so plainly a machine can lift it whole, with a number attached and a source it can credit. A page can rank well and still be useless to an AI because it buries its answer three paragraphs into a sales pitch.

Measurement diverges too. SEO has mature tools: rankings, traffic, impressions. GEO measurement is younger and blunter, you check it by asking the tools the questions your buyers ask and noting whether you appear. And the unit of success is different: SEO counts clicks, GEO counts mentions, many of which never produce a click because the answer was complete without one.

Which should a B2B company invest in?

Both, and the honest sequencing is straightforward. SEO is the foundation, and because AI tools read the same well-built pages, the work you do for SEO already advances GEO. Skipping it means losing on both fronts.

GEO is where the open field is. In our experience most established B2B companies are simply invisible in AI answers today, named nowhere while the tool describes their competitors. That is not bad news; it is an opening, because the specific questions your buyers ask assistants have few good answers online, and a company that answers them plainly can own them.

The test takes five minutes: open ChatGPT or Perplexity and ask what a buyer would ask, “best [what you do] for [who you serve].” Note whether you are named and which sources get cited. Answers vary between tools and over time, so watch the trend, not any single response. If you come up short, here is where to start.

1. Answer the questions your buyers actually ask, one clear answer per question, in plain language a machine can lift.
2. Publish specifics worth quoting: real numbers, tolerances, capacities, timelines, and original data no one else has.
3. Add structured data so machines know what your content is, not just that it exists.
4. Keep the machine-readable basics current, including an llms.txt file that points AI tools at what matters.
5. Earn mentions in the third-party sources AI leans on: industry directories, reviews, and genuine coverage.

The same buyer, two ways in

A buyer can reach you through either discipline, and the difference is not academic. It changes who you're up against and how ready they are when they land, which is why the two are worth pursuing together rather than one instead of the other.