AEO vs SEO: What's the Difference and How to Measure Both

Your Google traffic is flat. Your brand just showed up in a ChatGPT answer, and you did nothing specific to make that happen.

Those two facts are the AEO vs SEO question in practice. This guide covers what separates the two, what Google, Microsoft and OpenAI say about each, and how to measure both without building a separate stack per channel. I work at SE Ranking, so part of the data below comes from our own studies. Technical details were checked against vendor documentation on Oct 23, 2026.

What AEO, GEO and SEO mean

The terms have no shared definition, and the vendors use them differently.

• SEO is earning visibility in classic search results: a ranked URL that earns clicks.
• GEO comes from a 2023 research paper. It framed GEO as a way to improve content visibility in generative engine responses and reported gains of up to 40% on its own benchmark, with results varying by domain.
• AEO usually means getting cited or surfaced as the answer in AI systems. In its January 2026 guide, Microsoft splits the two: AEO is about clear content and product data that AI assistants and agents can retrieve, and GEO is about being discoverable and persuasive inside generative systems.
• Google treats it as one job. Its guide to generative AI features says "optimizing for generative AI search is optimizing for the search experience, and thus still SEO."

Search interest is split across the names too. SE Ranking data for the US (Oct 2026) shows about 6,600 monthly searches for "ai seo," 3,600 for "generative engine optimization," 2,400 for "what is aeo" and 1,900 for "answer engine optimization." In this post, AEO means one goal: being cited or mentioned in an AI-generated answer, wherever that answer appears.

What stays the same

Google's AI Overviews and AI Mode run on the same core ranking and quality systems as Search. According to Google's documentation, a page qualifies as a supporting link when it is "indexed and eligible to be shown in Google Search with a snippet," and "there are no additional requirements to appear in AI Overviews or AI Mode, nor other special optimizations necessary."

Authority carries over too. In SE Ranking's analysis of ChatGPT citations (129,000 domains, reported by Search Engine Journal in Nov 2025), referring domains were the strongest single predictor. Sites with up to 2,500 referring domains averaged 1.6 to 1.8 citations, and sites with more than 350,000 averaged 8.4. Pages ranking in Google positions 1 to 45 averaged 5 citations against 3.1 for positions 64 to 75. These are correlations in a ChatGPT-only dataset, not proven ranking factors.

The cited page is not always the one that ranks for your target query. Google says its AI features may use "query fan-out": the system runs several related searches across subtopics and sources, so a page can be cited because it ranks for a sub-question and not for the original prompt.

What actually differs

Access

Google needs nothing beyond Search eligibility. The other engines have their own crawlers, and blocking one removes you from that engine.

• OpenAI. OAI-SearchBot relates to ChatGPT search, and OpenAI says to make sure you are not blocking it. GPTBot relates to training and can be disallowed separately.
• Anthropic. Claude-SearchBot supports search results and Claude-User fetches pages for user questions. Anthropic says blocking either may reduce your visibility in Claude. ClaudeBot collects training content.
• Perplexity. PerplexityBot is "designed to surface and link websites in search results" and is not used for foundation model training. Perplexity-User generally ignores robots.txt because a person requested the fetch.

Check robots.txt and any bot rules on your CDN before you work on anything else. A blocked crawler makes the rest of this guide irrelevant for that engine.

What counts as success

SEO is measured in rankings and clicks. AEO is measured in whether your brand is mentioned or cited in the answer, often with no click.

We tested this with Civoryx, a new brand SE Ranking built for an AI-visibility experiment that I designed and ran. The full write-up covers February to September 2026 across ChatGPT, Perplexity, Gemini, Google AI Overviews and AI Mode:

• On branded prompts, the brand's own site was cited in 74.9% of answers by September, up from 18.7% in February. 84.8% of branded answers mentioned the brand from April through September.
• On non-branded prompts, 1.8% of answers mentioned the brand. When a non-branded answer also cited an external article about it, the brand was named in 16.0% of answers. Without such an article, it was named in 0.29%.
• GA4 recorded 100 users from January to September, and one of them came from an AI assistant.

This is one brand with no control group, and engine behavior changed during the test, so read it as a single case and not a benchmark. It still shows two things. Citations are visibility, and they do not turn into traffic automatically. And for questions that are not about your brand, what other sites say about you mattered more than what your own site says.

The ChatGPT dataset points the same way: sites listed on several review platforms averaged 4.6 to 6.3 citations against 1.8 for sites on none. Google adds a limit here. It calls seeking inauthentic mentions less helpful than it seems, because its ranking and spam systems weigh quality and block spam.

How to optimize for both

Google's guide asks for four things: non-commodity content with first-hand experience and a point of view, content organized for readers with clear sections and headings, pages that are crawlable and indexed with snippets allowed, and the usual SEO basics. It warns against generic content a model could produce on its own.

The ChatGPT data adds specifics. They are correlations and apply to ChatGPT only:

• Freshness. Pages updated within three months averaged 6 citations against 3.6 for older pages.
• Evidence. Pages with 19 or more statistical data points averaged 5.4 citations against 2.8, and pages with expert quotes averaged 4.1 against 2.4.
• Section length. Sections of 120 to 180 words between headings averaged 4.6 citations. Sections under 50 words averaged 2.7.

Write the first sentence under each heading as the direct answer to it, because that reads well for people. Nothing I found shows that an AI system extracts from that sentence specifically.

Some common advice does not hold up:

• llms.txt and special markup. Google says Google Search ignores them. The ChatGPT study found negligible impact from llms.txt.
• FAQ and HowTo schema as an AEO lever. Google says there is no special schema.org markup for generative AI search. In the ChatGPT dataset, pages with FAQ schema averaged 3.6 citations against 4.2 without. Microsoft's guide does recommend structured data for products, offers, reviews, lists, FAQs and brand, so keep it where it serves Bing and rich results. Treat it as hygiene, not a shortcut.
• Chunking and rewriting for AI. Google says neither is needed. Mass-producing pages for query variations to steer AI answers falls under its scaled content abuse policy.

How to measure AEO vs SEO

No single report covers every surface. Four sources together do.

Google Search Console. Clicks and impressions from AI Overviews and AI Mode are counted in the regular Performance report under the Web search type. Since June 3, 2026, Google also has Generative AI performance reports for Search and Discover, rolled out to all sites worldwide by Aug 31, 2026. They show impressions by page, country, device and date. Queries are not among the dimensions.

Bing Webmaster Tools. The AI Performance report, launched in beta, shows total citations, average cited pages, grounding queries and page-level citation activity across Copilot, Bing's AI summaries and select partner integrations. It has no click data.

GA4. Clicks from third-party assistants arrive as referral traffic. OpenAI says ChatGPT adds utm_source=chatgpt.com to referral URLs, so these visits can be tracked in tools like Google Analytics. Build a custom channel group that isolates sessions from chatgpt.com, perplexity.ai, claude.ai and gemini.google.com. I documented the setup in how to track AI chatbot traffic in GA4. Expect small volume even when your brand is cited often.

An AI tracker. Mentions that never produce a click need a prompt-based tracker. SE Ranking's AI Results Tracker covers Google AI Overviews, AI Mode, Gemini and ChatGPT, and shows how often your brand is mentioned or linked and which competitors appear. I track k-o.pro and Keep Optimized in it. The numbers are small for a new domain, but the direction is clear: which topics trigger a mention and which do not. A tracker measures the prompts you give it, not what real users ask, and Google's guide warns that no third-party tool has access to Google's internal metrics.

Because the Generative AI report has no query dimension, query-level evidence has to come from the regular data. The Google Search Console MCP has a genai_conversation_queries tool that picks conversation-shaped queries out of your Web search data, such as follow-ups to an AI answer and long conversational questions. On k-o.pro, for June 30, 2025 to Oct 22, 2026, it found 4 such queries with 20 impressions and no clicks. That is a floor and not a total, since Google excludes rare anonymized queries, and AI Overviews and AI Mode cannot be told apart at query level.

FAQ

Will AEO replace SEO?

Not on the evidence available. Google's AI features run on its core ranking and quality systems, and Google calls optimizing for them SEO. In SE Ranking's ChatGPT data, pages that rank higher in Google average more citations.

Is AEO better than SEO?

They are not alternatives. The same page can be ranked in the results and cited in an answer, and you read the outcome in different reports. AEO adds crawler access and brand coverage beyond your own site on top of SEO.

Do I need separate pages for AEO?

No. Google lists no additional requirements for its AI features. In the Civoryx test, one 6,000-word guide was mentioned in 69.2% of its answers. That is a single example and not proof that longer content wins.

Where to start

Open your robots.txt and confirm OAI-SearchBot, Claude-SearchBot and PerplexityBot are not blocked. Then create the GA4 channel group and open the Generative AI report in Search Console, so the baseline starts accumulating before you change any content.