What Is AI SEO (ChatGPT SEO)? How It Relates to GEO and AEO, and Where to Start (2026)

Key takeaway: AI SEO (ChatGPT SEO) is not a new technique. It is the umbrella term for getting your brand cited in AI search answers. The underlying concepts are already defined as GEO (Generative Engine Optimization) and AEO (Answer Engine Optimization), and searchers look for them under the name "AI SEO". The starting order is: confirm crawler access → measure per question → strengthen citable structure.

What is AI SEO?

AI SEO is the industry term for the work of getting your brand or pages cited or mentioned in AI search answers — ChatGPT search, Google AI Overviews and AI Mode, Perplexity, and similar engines. "ChatGPT SEO" and "LLM SEO" are used with the same meaning.

Two concepts are already defined in research and industry. GEO (Generative Engine Optimization) raises the odds of being cited as a brand or source inside an AI response; AEO (Answer Engine Optimization) shapes sentences and structure so a page is selected as the source of a direct answer. AI SEO is the umbrella over both, not a separate third method.

Term	Definition	Exposure surface	Key signals
SEO	Rank higher in search results to earn clicks	List of ranked links	Backlinks, domain authority, keywords
AEO	Be selected as the source of a direct answer	Featured snippet, answer sentence in an AI response	Direct-answer paragraph, FAQ and HowTo schema
GEO	Be cited as a brand or source inside an AI response	Body of the AI response	Citable structure, structured data, external mentions
AI SEO	Umbrella term covering AEO and GEO	AI search answers in general	AEO + GEO

A term map from search demand — people search "AI SEO", the concepts are GEO and AEO

The terms need mapping because the name people search for differs from the name of the concept. RanketAI extracted Google Trends related queries on 2026-09-11 over a 12-month window.

Market	Seed query	Top related queries (relative index)	Rising
Korea	SEO	ai seo 100 · seo google 94 · naver seo 18 · seo optimization 12	claude seo (breakout)
Korea	GEO	what is geo 77 · geo seo 53 · aeo 46	what is geo +550% · aeo +350% · geo seo +170%
Korea	AEO	aeo ai 100 · geo aeo 92 · aeo seo 68 · seo geo aeo 31	aeo ai +300% · geo aeo +300%
US	ChatGPT SEO	chatgpt and seo 100 · ai seo 79 · chatgpt seo optimization 22 · perplexity 18	seo news +90%
US	AEO	aeo ai 100 · what is aeo 81 · aeo seo 57 · aeo optimization 51	aeo agency +350% · aeo and geo +350%

Three things stand out. First, in Korea the query people most often pair with SEO is "AI SEO". Second, GEO and AEO are searched along a definition-and-comparison axis: what does it mean, how does it differ from SEO. Third, the US is one step ahead, with execution-stage queries such as "aeo agency" and "aeo optimization". Korean demand is still at the definition stage, so this explainer focuses on definitions and a starting order.

The index is relative to the seed query, not an absolute search volume. Absolute volume for GEO/AEO-related terms in Korea is low: when the seed itself was "GEO optimization" or "AI search optimization", the related-query lists came back empty. Read the table with that limit in mind.

How ChatGPT SEO differs from optimizing for Google's AI features

The access path differs by engine. The content principles are shared, but crawler access has to be confirmed engine by engine.

ChatGPT search — OpenAI documents its crawlers by role. The one used for search citations is OAI-SearchBot.

"OAI-SearchBot is for search. … Sites that are opted out of OAI-SearchBot will not be shown in ChatGPT search answers, though can still appear as navigational links." — OpenAI, Overview of OpenAI Crawlers

The same document separates GPTBot (foundation-model improvement) from ChatGPT-User (fetching pages a user asked for). You can therefore block training while allowing search citation through separate robots.txt rules — and if OAI-SearchBot is blocked, no amount of content quality will make your page a source in ChatGPT search answers.

Google AI Overviews and AI Mode — Google's official guide sets no separate optimization requirement.

"To be eligible to be shown in generative AI features on Google Search, a page must be indexed and eligible to be shown in Google Search with a snippet, fulfilling the Search technical requirements. … Creating content that people find unique, compelling, and useful will likely influence your website's presence in generative AI search in the long run more than any of the other suggestions in this guide." — Google Search Central

In short, the difference between ChatGPT SEO and Google AI optimization is which crawler you allow and which index you enter; the conditions for citable content point the same way on both engines. How citation criteria differ by engine is covered in Guide #02: How ChatGPT, Claude, and Gemini cite brands differently.

Where to start with AI SEO — three steps

Step 1 — Confirm crawler access

Check robots.txt bot by bot for OAI-SearchBot, GPTBot, ChatGPT-User, Google-Extended, and PerplexityBot. Many sites block the very crawlers needed for search citation, and in that state steps 2 and 3 cannot take effect. RanketAI's Page Structure Diagnosis checks AI crawler access and answer-friendly structure for a single URL.

Step 2 — Measure where you stand, per question

Measure by the questions customers ask an AI, not by keyword rankings. Enter a question such as "Is there a tool for ranking higher in AI search in Korea?" into ChatGPT, Gemini, and Perplexity in the same wording, and record whether your brand appears among the candidates and in which position. The AI Brand Visibility Analysis menu repeats this measurement across several AI engines with the same questions. Optimizing before measuring leaves you unable to tell what changed.

Step 3 — Strengthen citable structure and third-party sources

For every question where you are absent, look at two things.

• Your own page structure — pages with question-style headings, a direct answer in the opening paragraph, comparison tables, explicit sources, and an FAQ are easier to cite. The method is in the GEO playbook — 5 steps to win AI answer share.
• Third-party sources — AI engines cite third-party pages, not just yours. The procedure is identify → classify → execute → re-measure, and the classification has three types: directly publishable (UGC), press or contributed-article routes, and structurally inaccessible. In RanketAI's single comparison measurement in July 2026, 15 source gaps split 20% / 33% / 47% across those three types. That was one category and one measurement, so the ratios do not generalize; borrow the classification method, not the numbers. Details are in Source gap analysis — third-party citations.

After strengthening, re-measure the same questions from step 2. AI search referrals converted at 14.2% versus 2.8% for Google search in an industry report (upGrowth 2026, not a RanketAI measurement), so even a small volume is worth tracking.

Frequently Asked Questions

Q. Is AI SEO a separate job from regular SEO?

No — it is a layer on top. Google's eligibility conditions for AI features are the standard Search technical requirements: indexed and snippet-eligible. Without an SEO foundation, AI SEO does not stand, and SEO alone does not guarantee an AI citation. Why that is so is covered in Guide #01: GEO vs SEO.

Q. Is there such a thing as "Claude SEO"?

"claude seo" appears among rising queries in Korea, but there is no separate technique. Claude also cites web sources in its answers, so the approach is the same: allow that engine's crawler, measure per question, strengthen citable structure. Crawler names and citation criteria by engine are in Guide #02.

Q. If my brand does not appear in AI search, is it a content problem?

Usually it is a content-structure problem, but not always. If a blocked crawler or a missing index from step 1 is in the way, fixing content changes nothing. That is why the order is crawler access → measurement → strengthening.

Q. With a small budget, what should I do first?

Steps 1 and 2 cost nothing to begin. You can read robots.txt yourself, and typing a handful of questions into ChatGPT, Gemini, and Perplexity and recording the results is free. For automated measurement, start with tools that offer a free diagnostic entry point — a comparison of Korean tools is in the Korean GEO tools comparison guide.

Related reading

• Guide #01: GEO vs SEO — Why SEO Alone Is No Longer Enough in the AI Search Era — AI search traffic and zero-click figures, and why GEO and AEO are needed.
• Guide #02: ChatGPT, Claude, Gemini — how each LLM cites brands — crawlers and citation criteria by engine.
• Why your content does not show up in AI search: SEO, AEO, GEO, AAO — how the four concepts relate, with a five-step self-diagnosis.
• Google AI Mode optimization guide: 7 signals more important than llms.txt — citation signals in Google AI Mode.