What is GEO? Generative engine optimization, without the hype.

Search is no longer only a list of links. A growing share of buying research now starts with an AI tool writing an answer: "What's the best accounting software for a five-person firm?" "Which roofing companies near me have good reviews?" "How much should SEO cost?"

The numbers explain why this matters. At Google I/O in May 2026, Sundar Pichai said AI Mode passed 1 billion monthly users in its first year and AI Overviews has more than 2.5 billion. At OpenAI's DevDay in September 2026, Sam Altman said 1.2 billion people use ChatGPT every week.

Generative engine optimization is the work of making sure your business is in those answers. This guide covers what GEO means, what the research that coined the term actually found (it's more specific than most articles suggest), and a one-hour audit you can run on your own site.

What is GEO?

GEO, or generative engine optimization, is the practice of making your content and your brand easy for generative AI systems to find, trust and cite when they write an answer.

A "generative engine" is any search tool that writes a response instead of only listing links:

• Google AI Mode and AI Overviews
• ChatGPT (with search)
• Gemini
• Perplexity
• Microsoft Copilot and Claude

Two outcomes count as a GEO win:

1. Citation. Your page is one of the sources the answer links to.
2. Recommendation. Your brand is named in the answer itself, for example in a shortlist of agencies, products or local providers.

The first sends traffic. The second often matters more, because the buyer gets your name at the moment they're deciding who to contact.

Where did the term GEO come from?

The term comes from a research paper, GEO: Generative Engine Optimization, by researchers at Princeton University and IIT Delhi. It was presented at KDD 2024, one of the main academic data-mining conferences.

The team built a benchmark of 10,000 queries across 25 subject areas and tested nine ways of rewriting web content to see which made it more visible in AI-generated answers. They tested on a generative engine they built themselves (powered by GPT-3.5) and on Perplexity.

Here's what they found:

The best methods lifted visibility by up to 40% on the researchers' own engine, and by up to 37% on Perplexity.

The practical takeaway is simple. AI engines favour content that sounds like a well-sourced expert: specific numbers, named sources, clear statements. The old habit of repeating a keyword over and over doesn't help, and it can hurt.

Two caveats worth knowing. The tests used 2023-era models, and AI search has changed a lot since then. The study also measured how much of a page's text made it into an answer. It didn't measure clicks, leads or sales. Treat it as evidence for a direction, not a formula.

How do AI engines choose which sources to cite?

Most AI search tools follow the same basic process when they answer a question that needs current information:

1. They rewrite the question into one or more searches. "Best CRM for a small law firm" might become several searches about legal CRMs, pricing and reviews.
2. They retrieve pages from a search index. This might be Google's own index, Bing's, or the platform's own crawler. If your page doesn't rank or can't be crawled, it's never considered.
3. They read the retrieved pages and pull out the useful parts. Clear, self-contained statements are easier to use than vague marketing copy.
4. They write the answer and attach citations to the sources they used.

That's why GEO is built on SEO rather than separate from it. Step 2 is basically a ranking problem. Steps 3 and 4 are where GEO-specific work, like answer-first writing, specific facts and named sources, makes the difference.

Recommendations work slightly differently. When an AI names businesses in a shortlist, it tends to reflect consensus across many sources: reviews, directories, "best of" lists, Reddit threads, press coverage. If ten trusted sites mention you and only your own site says you're great, the ten sites win. We cover the off-site side in depth in how to get your brand mentioned in ChatGPT.

GEO vs SEO vs AEO: how they fit together

They're layers, not rival strategies. SEO gets you retrieved. AEO gets you quoted. GEO gets you cited and named. If you want the AEO side explained, read what is AEO.

What does GEO work involve in practice?

For most businesses, GEO comes down to five areas of work:

1. Make sure AI crawlers can reach you

Check your robots.txt and firewall settings. OpenAI, for example, runs separate crawlers: GPTBot collects content for model training, while OAI-SearchBot decides whether you can appear in ChatGPT search answers. Blocking GPTBot doesn't remove you from ChatGPT search. Blocking OAI-SearchBot does. Plenty of sites block both by accident through a security plugin or CDN setting.

2. Write content AI can lift cleanly

Lead each section with a two- or three-sentence answer. Use the buyer's question as the heading. Put comparisons in tables and steps in numbered lists. Every page on this blog opens with a "Quick answer" box for this reason.

3. Replace vague claims with facts and sources

This is the strongest finding in the original research. "We've helped lots of businesses grow" gives an AI nothing to use. "A cannabinoid brand's monthly organic revenue grew from $11,344 to $47,503" is a fact it can cite and attribute. Add dates, prices, figures and named sources wherever you can back them up.

4. Make your brand unmistakable

Use the same business name, description, services and locations across your website, Google Business Profile, LinkedIn and directories. Add Organization schema with sameAs links to your profiles. Inconsistent details make AI tools less confident about naming you.

5. Build mentions off your own site

Reviews, directory listings, guest articles, podcast appearances, industry roundups and genuine community answers. This is the slowest part of GEO, and it's the part that drives recommendations.

A one-hour GEO audit you can run yourself

You don't need a tool subscription to find out where you stand. Block out an hour and work through this:

1. Write 10 buyer prompts. Mix "best [service] for [type of customer]", "[service] in [city]", "how much does [service] cost" and "[your brand] vs [competitor]".
2. Run each prompt in ChatGPT, Gemini, Perplexity and Google AI Mode. Use a logged-out or fresh session where possible.
3. Record three things per answer: whether you're cited, whether you're named, and which sources and competitors appear instead.
4. Look for patterns in the sources. If the same directories, review sites or publications keep appearing, those are the places you need to be listed or mentioned.
5. Check your robots.txt for rules blocking OAI-SearchBot, PerplexityBot or other AI crawlers you want to allow.
6. Open your three most important service pages and ask: does each section start with a clear answer? Are there specific numbers? Are sources named?
7. Set up AI tracking in GA4. Create a custom channel group where the session source matches chatgpt\.com|chat\.openai\.com|perplexity\.ai|claude\.ai|gemini\.google\.com|copilot\.microsoft\.com, and move it above Referral. ChatGPT adds utm_source=chatgpt.com to many of its citation links, but app traffic can still show up as Direct, so treat this as a floor, not a total.

Save the prompts and repeat the test monthly. That gives you a simple share-of-voice trend without paying for anything.

How long does GEO take, and what does it cost?

On-page fixes like answer-first sections, added statistics and crawler access can show up in AI answers within a few weeks once pages are re-crawled. Becoming a brand AI tools recommend by name takes longer, typically several months, because it depends on mentions and reviews building up across the web. It follows a similar curve to how long SEO takes.

Cost-wise, GEO is rarely worth buying as a standalone service. The retrieval step depends on your SEO, so you end up paying for the same work twice. It makes more sense as part of an SEO retainer. Our SEO packages start at $1,199 a month with GEO and AEO included, and we break down typical market rates in how much SEO costs.

Common GEO mistakes

• Treating GEO as a trick. Hidden prompts, AI-only pages and keyword-stuffed "LLM content" don't hold up. The research found keyword stuffing made things worse.
• Ignoring SEO basics. If your pages don't get retrieved, nothing else matters.
• Publishing generic content. If your page says what fifty others say, there's no reason to cite you over them.
• Measuring only clicks. Being named in an answer is valuable even when nobody clicks. Track mentions as well as traffic.
• Blocking the wrong bots. Opting out of AI training is a fair choice. Accidentally opting out of AI search is usually not.

The bottom line

GEO is SEO plus credibility. Get crawled and ranked, write in a way that's easy to quote, back up what you say with real numbers and sources, and build a reputation that other sites reflect. The businesses that do this now are the ones AI tools will be naming when your buyers ask.

If you'd rather have it handled, every Hello Bleu SEO package includes GEO. Book a free call and we'll show you where you stand in AI answers today.

Sources: Aggarwal et al., "GEO: Generative Engine Optimization", KDD 2024 (arXiv:2311.09735); Google I/O keynote, May 2026 (AI Mode and AI Overviews user figures); OpenAI DevDay, 29 September 2026, as reported by Engadget (ChatGPT weekly users); OpenAI, "Overview of OpenAI Crawlers" developer documentation (GPTBot and OAI-SearchBot), checked October 2026.