GEO vs AI SEO vs ADO — what's actually different?

If you've been pitched by an "AI SEO" agency lately, you've probably heard five different acronyms thrown at you: AI SEO, GEO, AEO, ChatGPT SEO, ADO. They sound like they mean different things. Mostly, they don't — they're overlapping layers of the same shift away from traditional ten-blue-link SEO.

Here's the plain-English version.

AI SEO — the umbrella term

AI SEO is the catch-all for optimizing content, schema, and authority for any AI-powered search surface — ChatGPT, Claude, Gemini, Perplexity, Google AI Overviews, Bing Copilot, and whatever launches next quarter.

If someone says "we do AI SEO," they probably mean everything below.

GEO — Generative Engine Optimization

GEO is a narrower term focused on being cited inside AI-generated answers. When ChatGPT or Gemini synthesizes a response and shows source footnotes, GEO is the discipline that gets your business into those footnotes.

Goal: be the answer.

AEO — Answer Engine Optimization

AEO overlaps heavily with GEO. The distinction (when anyone bothers to make one) is that AEO focuses specifically on direct answer engines — Google Featured Snippets, voice assistant answers, zero-click search results — while GEO covers full generative responses.

In practice, the tactics are nearly identical: structured content, Q&A formatting, FAQ schema, clear authoritative writing.

ChatGPT SEO / Claude SEO / Gemini SEO / Perplexity SEO

Platform-specific shorthand. Each LLM has its own training data, retrieval-augmented generation (RAG) sources, and recommendation behavior. ChatGPT SEO just means GEO tactics tuned for ChatGPT's specific quirks (it weights llms.txt heavily, prefers Q&A patterns, cites Reddit more than Google does).

"LLM SEO" is the same idea, generalized to all large language models.

ADO — Agent Discovery Optimization

ADO is the deepest layer. It's not about being cited to a user — it's about being chosen by autonomous AI agents that book, quote, and transact on behalf of users without the user ever visiting your website.

After Google I/O 2026, this is real. Gemini Spark can call a restaurant, check availability, make a reservation, and confirm it back to the user — all without a human ever loading your site. ADO is how you make sure the agent picks you.

Goal: be the booking.

So which one do I need?

All of them. The tactics overlap so much that doing GEO well automatically does AEO well, and doing ADO well requires GEO as a prerequisite.

What actually matters is whether the technical foundation is in place: llms.txt, robots.txt with AI crawler allow rules, full schema.org markup, Q&A content patterns, and citations across the directories AI models trust.

That foundation is the same whether you call it AI SEO, GEO, ADO, or "the new SEO." The acronym wars don't matter — the work does.

— Isaiah