An SEO agency gets you ranked where people search. A GEO agency gets you named where people ask. As buyers shift questions from Google to ChatGPT, Gemini, Claude, and Perplexity, the difference stops being academic and starts showing up in pipeline.
SEO optimizes for positions on a results page: rankings, clicks, traffic. GEO (generative engine optimization) optimizes for presence inside AI answers: whether assistants mention you, how they describe you, and whether you make the shortlist. There are no positions eleven through one hundred in an AI answer. There is named, or not.
An SEO agency ships keyword strategy, technical fixes, links, and ranking content. A GEO agency ships answer-ready content, structured data, corrected third-party sources, presence in the reviews and comparisons assistants cite, and continuous monitoring of what the assistants say. The deliverables overlap maybe a third. The measurement overlaps almost none.
GEO requires things SEO never demanded: tracking probabilistic answers across four assistants, diagnosing which citations carry a recommendation, writing content that models quote rather than pages that rank, and covering conversational buyer moments instead of keyword lists. Ask any agency how they measure AI answers and the difference reveals itself in one sentence.
Still building basic organic presence? SEO first: GEO builds on an indexable, authoritative site. Solid rankings but absent from AI answers? That is a GEO gap, and it compounds while ignored. High-consideration categories where buyers research with AI (software, legal, financial, healthcare) should be running both now.
Foundations shared, last mile different. Some brands run an SEO agency and layer a GEO specialist on top. Aethon is built as the GEO layer: we track your presence across ChatGPT, Gemini, Claude, and Perplexity, then ship the fixes that change the answers, working alongside whatever SEO program you already run.
An SEO agency improves your rankings in search results. A GEO agency improves whether and how AI assistants like ChatGPT, Gemini, Claude, and Perplexity name and recommend your brand in their answers.
No. Strong SEO helps, since assistants draw on the indexed web, but AI answers weigh consensus, quotability, and citation sources differently. Plenty of top-ranking brands are invisible in AI answers.
Some try. The practical test is measurement: if an agency cannot show you how your AI answers changed month over month, they are not doing GEO. Aethon specializes in the GEO layer and works alongside SEO programs.
When buyers in your category research with AI, and your brand is absent or misdescribed in those answers. An AI visibility audit establishes this in about a week.
Mention rates across assistants, share of voice versus competitors, sentiment of descriptions, citation sources behind answers, and the specific answers that changed after their work shipped.