What Is GEO (Generative Engine Optimization)? A Practical Guide for 2026

Growthclan Team · October 15, 2026

When someone asks ChatGPT “which CRM should a 20-person B2B team use?” or asks Google a question that triggers an AI Overview, they get a written answer with a few names and a handful of cited sources. Being one of those names is the new page one.

Generative Engine Optimization (GEO) is the discipline of earning that place. This guide explains what GEO is, how AI assistants choose what to say, and what you can do about it — without the hype.

GEO in one sentence

GEO is the practice of improving how often, how prominently and how accurately your brand appears in answers produced by generative AI systems — ChatGPT, Perplexity, Gemini, Claude, Microsoft Copilot, and Google’s AI Overviews and AI Mode.

You will also see it called AI search optimization, answer engine optimization (AEO) or LLM SEO. The labels differ; the goal is the same.

The term was popularised by a 2023 research paper, GEO: Generative Engine Optimization (Aggarwal et al.), which tested how different content changes affected a source’s visibility in AI-generated answers. Its headline finding is still useful: adding citations, quotations from credible sources and concrete statistics made content markedly more visible in generated answers — by up to roughly 40% on the authors’ benchmark — while old tricks like keyword stuffing did not help.

How AI assistants decide what to say

To optimise for something you need a working model of how it behaves. Simplified, an AI answer comes from two places:

1. What the model already “knows” from its training data. This is a fuzzy, compressed picture of the web at training time. If your company was barely mentioned, or described inconsistently, the model’s picture of you will be weak or wrong.
2. What the assistant retrieves live. Perplexity, ChatGPT search, Copilot, Gemini and Google AI Overviews run searches, read a few pages and synthesise an answer, usually with citations. Here, classic search visibility and how quotable your page is matter a lot.

In both cases the system is trying to produce a confident, accurate answer quickly. It favours sources that are easy to find, easy to read, consistent with other sources and clearly authoritative.

The four levers of GEO

1. Be retrievable

If an assistant cannot fetch and read your page, nothing else matters.

• Allow the AI search and user agents you care about in robots.txt (for example OAI-SearchBot, ChatGPT-User, PerplexityBot, Claude-SearchBot). Blocking training crawlers such as GPTBot is a separate business decision.
• Serve your important content as server-rendered HTML. Many AI crawlers fetch raw HTML and do not execute JavaScript, so content that only appears after client-side rendering may be invisible to them.
• Keep solid technical SEO: clean sitemaps, fast pages, sensible canonicals. Live AI search often starts from a traditional search index.

2. Be quotable

Generated answers are built from sentences lifted or paraphrased from sources. Make yours easy to lift:

• Answer the question directly in the first lines of a section, then expand.
• Use clear definitions (“X is…”), numbered steps, comparison tables and FAQs.
• Include specific, sourced facts and numbers. Vague marketing copy gives a model nothing to cite.
• One idea per paragraph, descriptive headings, and the question phrased the way buyers ask it.

3. Be consistent

Models cross-check. If your website says one thing, your LinkedIn page another and a directory a third, the model hedges — or picks the wrong version.

• Keep company name, description, category, pricing model and locations identical everywhere.
• Use structured data (Organization, Service, Product, FAQPage) to state the facts explicitly.
• Maintain an up-to-date About page that plainly says who you are, what you do and for whom.

4. Be vouched for

AI answers lean heavily on third-party sources: review sites, comparison articles, “best of” lists, community discussions, industry publications. Your own site saying you are great is the weakest signal.

• Earn mentions on the pages assistants actually cite for your category — find them by looking at the citations in the answers you test.
• Contribute expert commentary, original data and case studies others want to reference.
• Encourage genuine reviews on the platforms relevant to your market.

How to measure GEO

GEO has no Search Console. You build your own measurement:

1. Define a prompt set. 20–50 questions your buyers really ask, across the funnel: “what is…”, “best … for …”, “X vs Y”, “how much does … cost”.
2. Run it across assistants on a fixed schedule, with search enabled where available.
3. Record whether you are mentioned, your position in the answer, whether the description is accurate, the sentiment and which URLs are cited.
4. Benchmark competitors on the same prompts to get share of voice.
5. Connect to revenue. Track referrals from chatgpt.com, perplexity.ai, gemini.google.com and similar in analytics, and add “how did you hear about us?” to your forms — many AI-influenced buyers arrive later through direct or branded search.

Answers are non-deterministic, so treat single responses as anecdotes and trends over the full prompt set as data.

What GEO is not

• Not a trick. Hidden text, prompt-injection attempts and fake reviews are fragile and can damage your reputation with both users and platforms.
• Not separate from SEO. Most of the foundations are shared. See our comparison of SEO vs GEO.
• Not one file. An llms.txt file is a cheap, sensible addition, but it will not make an assistant recommend you on its own.

A 30-day GEO starter plan

• Week 1: build your prompt set and record a baseline across assistants.
• Week 2: fix retrievability — robots.txt, server-side rendering of key pages, sitemaps, structured data.
• Week 3: rewrite your five most important pages to answer buyer questions directly, with facts, comparisons and FAQs.
• Week 4: list the third-party pages cited for your category and start earning a presence on them; re-run the prompt set.

For a step-by-step version, read how to get cited by ChatGPT, Perplexity and Google AI Overviews.

If you would rather have a senior team do it with you, that is exactly what our GEO consulting covers — from the AI-visibility baseline to monthly share-of-voice tracking.