AEO (answer engine optimisation) is not a replacement for SEO. It is SEO applied to a different kind of result: instead of competing for a blue link, you are trying to be one of the sources an AI answer draws on and cites. Most of the foundations are the same, but the goal, the format of success and the way you measure it change.
This post is a side-by-side comparison so you can decide where to spend effort. If you want the practical to-do list, use my AEO and GEO checklist for business websites instead; this one is about understanding the difference.
Short definitions
- SEO (search engine optimisation) is the work of making your pages crawlable, indexable, relevant and trusted enough to rank in search results and earn clicks.
- AEO (answer engine optimisation) is the work of making your content the kind that answer-style results, such as Google's AI Overviews and AI Mode, ChatGPT search or Perplexity, can find, understand and cite when someone asks a question.
- GEO (generative engine optimisation) is a closely related term, usually used for visibility inside AI assistants more broadly. In practice people use AEO and GEO almost interchangeably. I explain why both have become important in why AEO and GEO now matter as much as SEO.
What Google itself says about the difference
This is the most important point, and it is often left out of AEO sales pitches. As of October 2026, Google's own documentation on AI features says there are no additional requirements to appear in AI Overviews or AI Mode, and no special optimisations necessary. To be eligible, a page must be indexed and eligible to be shown in Google Search with a snippet. Google also says you do not need new machine-readable files, AI text files or special markup to appear.
Google's guide on optimising for generative AI features, published in May 2026, goes further and describes AEO and GEO as SEO applied to the AI search experience. Its "mythbusting" section says you do not need to break content into tiny chunks, rewrite it in a special way for AI, or rely on special schema. Its main advice is to create original, first-hand, non-commodity content and keep the technical basics clean.
So for Google specifically, AEO is not a separate discipline. Good SEO is the entry ticket. Check Google Search Central for the current version of these pages, because they are updated as the features change.
Where AEO genuinely differs from SEO
If Google says it is all SEO, why does the distinction matter at all? Because three things are different in practice.
1. There is more than one engine, and they do not share an index
Google's AI features draw on Google's own index. ChatGPT search and Perplexity use their own crawlers. As of October 2026, OpenAI's crawler documentation says sites that opt out of its search crawler, OAI-SearchBot, will not be shown in ChatGPT search answers, and that blocking GPTBot (the training crawler) is a separate choice that does not control search visibility. Perplexity's documentation similarly says PerplexityBot is the crawler used to surface and link websites in its results. So a robots.txt file written years ago, or a security tool that blocks unfamiliar bots, can make you invisible in one engine while you rank well in Google.
2. The unit of success is a citation, not a ranking position
In classic search you can track a position for a keyword. In AI answers, the answer is generated per question, may be different for different users, and lists a handful of sources. Success is being one of those sources, or being named in the answer, often for a question you never explicitly targeted. Google notes that its AI features may use "query fan-out", running several related searches across subtopics to build one response, which is one reason the sources shown can be broader than the top ten results for the original query.
3. Clicks matter less, mentions matter more
An AI answer may satisfy the reader without a click. That makes it more important that the answer gets your business details right: what you do, where, for whom, and at what price point. Being described accurately is a form of visibility even when no one visits your site.
AEO vs SEO: side-by-side comparison
| Dimension | SEO | AEO |
|---|---|---|
| Main goal | Rank pages and earn clicks | Be cited or named inside AI answers |
| Where it shows | Classic search results | Google AI Overviews and AI Mode, ChatGPT search, Perplexity and similar tools |
| Crawl access | Googlebot, Bingbot | The same, plus each AI engine's search crawler (for example OAI-SearchBot, PerplexityBot) |
| Content format | Pages matched to a query's intent | The same pages, with clear, quotable answers and specific facts |
| Trust signals | Links, brand reputation, quality | The same, plus consistent mentions of your business across the web |
| Measurement | Positions, impressions, clicks, conversions | Citation checks on target questions, brand mentions, referral traffic from AI tools, conversions |
| Special files or markup | Standard structured data for rich results | Google says none needed for its AI features; other engines may differ |
| Speed of change | Rankings move over weeks and months | Answers can change between sessions and as engines update |
What stays exactly the same
Most of the work that makes a page rank is the same work that makes it citable.
- Crawlability and indexing. If a page is not indexed, it cannot be used. Technical SEO is still the foundation.
- Clear intent per page. One page that answers one question well beats a page trying to rank for everything.
- Original expertise. First-hand detail, your process, your constraints, real examples from your work. Google's guidance specifically calls for content created from what you know about the topic.
- Important content in text. Prices, service areas and process steps hidden in images or PDFs are harder for any system to use.
- Reputation. Being mentioned and linked by credible, relevant sources helps in both worlds.
What changes in how you write and plan
The differences are mostly in emphasis, not in technique.
- Plan around questions, not only keywords. List the actual questions buyers ask before they contact you: cost, timelines, comparisons, "is this right for me". AI answers are triggered by these.
- Answer first, then explain. Put a direct two- or three-sentence answer near the top of the page, then the detail. This helps readers and makes your page easy to quote accurately. It is not a trick; it is good writing.
- Be specific and consistent about your business. Use the same business name, location, services and pricing language on your site, Google Business Profile and other profiles, so whichever source an engine uses, the facts match.
- Cover comparisons honestly. Buyers ask AI tools "X vs Y" questions. Pages that explain trade-offs fairly are more useful than pages that only sell.
- Check robots.txt and firewall rules. Decide deliberately which AI crawlers you allow. For most businesses that want to be found, allowing the search crawlers is the sensible default, while training crawlers are a separate business decision.
How to measure each
For SEO, Google Search Console and GA4 remain the core tools. Google says traffic from its AI features is included in overall Search Console data under the Web search type, and its May 2026 guide also points to a Generative AI performance report in Search Console. Check your own account, as reporting features roll out over time.
For AEO across other engines, measurement is less mature. A practical approach is to keep a list of twenty to forty target questions, check them monthly in the engines your buyers use, and note whether you are cited, named, or absent. Add UTM-tagged links where you control them, and watch referral traffic from AI tools in GA4. Treat any third-party tool that claims to know an engine's internal ranking with caution; Google's guide says no third-party tool has access to its internal systems.
Should you hire for AEO separately?
For most small and mid-sized businesses, no. You need one person or team that understands both, because the work overlaps so heavily. Paying one vendor for SEO and another for AEO usually means duplicated audits and conflicting advice. What you should check is whether your SEO provider understands crawler access for non-Google engines, writes question-led content, and tracks citations as well as rankings. If they do not, that is the gap to fill. My AEO service is built as an extension of SEO strategy for exactly this reason.
Frequently asked questions
Is AEO replacing SEO?
No. For Google's AI features, Google says the same SEO fundamentals apply and no special optimisation is needed. AEO adds attention to other engines' crawlers, question-led content and citation tracking on top of SEO.
Do I need llms.txt or special schema for AEO?
For Google, its own guide says you do not need new machine-readable files, AI text files or special schema to appear in its AI features. Structured data is still useful for rich results. Other engines publish their own guidance, so check their official documentation.
Can I rank on Google but not appear in ChatGPT answers?
Yes. ChatGPT search relies on OpenAI's own crawler and other sources, so if OAI-SearchBot is blocked, OpenAI says your site will not be shown in ChatGPT search answers. Check your robots.txt and any bot-blocking settings at your host or CDN.
How long does AEO take to show results?
It depends on whether your pages are already indexed and trusted, how competitive the questions are, and how often each engine refreshes. If your SEO foundations are already sound, citation changes can appear sooner than new rankings; if not, fix SEO first.
What is the difference between AEO and GEO?
They overlap almost entirely. AEO is often used for answer-style results in search, and GEO for visibility inside generative AI assistants. The practical work is the same.
Next step
If you want to know whether your site is set up for both classic search and AI answers, a 30-minute strategy session is a simple place to start. It is ₹2,999 + GST as an introductory offer, and we will check crawler access, a few of your key questions, and where your effort is best spent. You can book a call here.
