What is GEO? The complete guide to AI visibility

Your customers don't search like they used to

Two years ago, when someone looked for a product or service, they typed keywords into Google and browsed the top 10 results. Today, a growing share of those searches goes through ChatGPT, Perplexity, or Google AI Overviews.

The difference? AI doesn't show a list of links. It synthesizes an answer and cites the sources it considers most reliable. If your site isn't among them, you're invisible — even if your content is excellent.

According to a McKinsey study published in 2025, approximately $750 billion in US revenue will be influenced by AI-assisted search by 2028. GEO is the discipline that lets you capture this opportunity.

GEO in one sentence

GEO (Generative Engine Optimization) is the set of techniques that help your website get cited, recommended, and featured in answers generated by artificial intelligence.

The term was formalized by researchers from Princeton, Georgia Tech, and the Allen Institute for AI in a study published in late 2023. Their work shows that GEO methods can increase a site's visibility in AI answers by 40%.

How AI chooses its sources

When you ask ChatGPT or Perplexity a question, the AI doesn't "search" like Google. It follows a multi-step process:

1. Retrieval — The AI identifies 200 to 500 potentially relevant web pages
2. Semantic ranking — It evaluates the thematic relevance of each page
3. Credibility filtering — It eliminates anonymous, unsourced, or unverified sources
4. Synthesis — It merges the best sources into a narrative answer
5. Citation — It attributes each claim to its source

At each step, your site can be eliminated. GEO ensures it passes all filters.

What GEO checks (that SEO ignores)

| Criteria | Traditional SEO | GEO | |----------|----------------|-----| | Goal | Appear in the 10 blue links | Be cited in the AI answer | | Keywords | Density and placement | Q&A structure and direct answers | | Backlinks | Number and quality | Mentions and third-party citations | | Content | Length and originality | Structured data, identified authors, cited sources | | Technical | Speed, mobile, HTTPS | JSON-LD, llms.txt, AI crawler access |

The 3 pillars of GEO

1. Technical visibility

AI needs to understand your content in a structured way. This requires:

• Structured data (JSON-LD) — Invisible tags that describe your content to machines. A study shows that GPT-4 improves its correct response rate from 16% to 54% when content is supported by structured data.
• The llms.txt file — An emerging standard that helps AI understand your site structure.
• AI crawler access — GPTBot, ClaudeBot, PerplexityBot: 14 different AI robots must be able to access your content.

2. Credibility

AI doesn't cite just anyone. It looks for trust signals:

• An identified author with name, title, and biography
• Cited sources — links to studies, official reports, .gov or .edu sites
• Dated content — AI prioritizes recent information
• Sourced statistics (e.g., "According to Gartner (2025), 84% of companies...")

3. Reputation

Beyond your site, AI checks your existence on the rest of the web:

• Social media presence
• Customer reviews and testimonials
• Mentions in third-party sources
• Information consistency (name, address, phone)

Why SEO is no longer enough

60% of Google searches now end without a click — the user gets their answer directly in the interface. On mobile, that figure reaches 77%.

This doesn't mean SEO is dead. It means SEO alone is no longer enough. A site can be perfectly optimized for Google (position 1 for its keywords) and completely absent from ChatGPT's answers.

GEO doesn't replace SEO — it complements it. Together, they cover the entirety of your customers' search journey.

Where to start?

The first step is to measure. What's your current GEO score? What signals is your site missing to be cited by AI?

TryGEO automatically analyzes your site on 6 criteria (3 SEO + 3 GEO) and gives you a diagnostic in 30 seconds with concrete recommendations.