What Is GEO (Generative Engine Optimization)? GEO vs SEO Explained

GEO in one paragraph

Generative engine optimization (GEO) is the practice of making your brand, product and content more likely to appear in answers generated by AI systems such as ChatGPT, Perplexity, Gemini, Claude, Microsoft Copilot and Google AI Overviews. Instead of competing for one of ten blue links, you compete to be one of the few sources an AI cites, or one of the three to five products it names when someone asks for a recommendation.

You will also see related terms: AEO (answer engine optimization), LLM SEO, AI SEO and AI search optimization. They describe overlapping practices. GEO is the most widely used label.

Where the term came from

"GEO" was introduced in a 2023 research paper titled "GEO: Generative Engine Optimization" by researchers from Princeton, Georgia Tech, the Allen Institute for AI and IIT Delhi, later presented at the KDD conference in 2024.

The researchers built a benchmark of queries and tested how different content edits changed a source's visibility in generated answers. Methods like adding citations to credible sources, adding relevant quotations, and adding statistics improved visibility in their setup, while traditional keyword stuffing did not help.

Treat the findings as directional, not as a formula: the experiments used their own test engine and queries, and commercial AI systems change often. But the core lesson holds up well in practice: AI systems prefer content that is specific, sourced and easy to quote.

GEO vs SEO: the real differences

Why GEO still depends on SEO

Most AI answer engines with web access do not crawl the entire internet themselves at answer time. They run searches against an index (their own, or a partner's), retrieve a handful of pages, and generate an answer from them.

That means:

• If a page is not indexed or not crawlable, it is unlikely to be retrieved.
• Pages that rank reasonably well for a query and its sub-questions are more likely to be in the retrieved set.
• Authority signals (links, mentions, topical depth) still affect which pages get retrieved.

GEO is best understood as SEO plus extra emphasis on how your brand is described everywhere, and on content that is easy to extract and quote.

The GEO checklist for startups

What content gets cited

In our experience, the passages AI answers quote tend to share traits:

• Self-contained: the passage makes sense without the rest of the page.
• Specific: "Plans start at $29/month for up to 3 users" instead of "affordable pricing".
• Structured: numbered steps, short definitions, comparison rows.
• Attributed: claims tied to a named source, test or dataset.
• Current: a recent update date and no outdated facts.

A quick test: copy one section of your page into a chat with no context. If it still reads as a complete, useful answer, it is GEO-friendly. If it depends on paragraphs above it, rewrite the opening sentence to stand alone.

How to measure GEO

1. Build a list of 25-50 prompts your buyers would ask an AI tool.
2. Each month, run them in the engines that matter to your audience (for example ChatGPT, Perplexity, Gemini and Google with AI Overviews), with web search on where available.
3. Record for each: were you mentioned, in what position, with what description, and which sources were cited.
4. Calculate share of voice: mentions divided by total prompts, overall and per engine.
5. Track referral traffic from AI tools in analytics and ask new signups where they heard about you.

The cited sources list is your outreach list. Getting accurately described on those pages is often the fastest way to move the numbers. If you want this done for you, see our GEO and AI search service.

Common GEO myths

• "GEO replaces SEO." AI search engines retrieve from indexes built by crawling and ranking, so SEO fundamentals remain the base layer.
• "There is a secret file or tag." No major AI search provider has published a special markup that guarantees citations. llms.txt is a proposal, not a ranking factor; see our llms.txt guide.
• "You can buy placement in AI answers." Organic AI answers cannot be bought. Some platforms experiment with clearly labeled ads, which are separate from organic answers.
• "Only big brands get cited." For narrow, specific questions, a small site with the clearest answer is regularly cited.
• "Results are random, so measurement is pointless." Individual answers vary, but share of voice across a fixed prompt set over months shows real trends.