Answer Engine Optimization (AEO): Ranking in ChatGPT & Perplexity

Millions of people now ask ChatGPT, Perplexity, Microsoft Copilot and Google’s AI features for answers they used to search for. Instead of ten links, they get a written response with a handful of cited sources. Being one of those sources is the new front page. Answer engine optimisation (AEO) is the discipline of earning that position, and it rewards many of the same things good SEO does, with some important differences. If you want to rank in ChatGPT, improve Perplexity SEO and get cited by AI answers, answer engine optimization is the discipline that decides it.

What is an answer engine?

An answer engine is a search experience that responds with a synthesised answer rather than a list of links. Most modern answer engines combine a large language model with live retrieval from a web index, then cite the pages they used. Examples include ChatGPT search, Perplexity, Microsoft Copilot, Google’s AI Overviews and AI Mode, and Gemini.

AEO, GEO and SEO: what is the difference?

The terms overlap and are often used interchangeably. A useful distinction:

• SEO optimises pages to rank in search results.
• AEO optimises content to be selected as the direct answer, including featured snippets, voice answers and AI-cited passages.
• GEO (generative engine optimisation) focuses specifically on visibility inside generative AI responses. See our GEO playbook.

How the main answer engines find sources

What makes content likely to be cited

1. Answer the question directly

Put a clear, self-contained answer in the first sentences under a descriptive heading. Answer engines extract passages, so each section should make sense on its own without relying on earlier context.

2. Be specific and evidence-based

Specific numbers, definitions, steps, prices, dates and named examples are easier to quote than vague claims. Cite sources for statistics and link to primary research.

3. Add information others do not have

Original data, case examples, expert commentary and first-hand testing give an engine a reason to cite you rather than one of a dozen near-identical pages.

4. Structure for extraction

• Question-style H2 and H3 headings that match how people ask.
• Short paragraphs, numbered steps and bulleted lists.
• Comparison tables for “X vs Y” topics.
• FAQ sections that answer follow-up questions concisely.
• Structured data such as Organization, Article, Product and LocalBusiness to clarify entities.

5. Demonstrate expertise and trust

Named authors with relevant experience, clear business information, transparent sourcing, updated dates and a strong reputation all make content safer for an engine to recommend.

6. Build brand consensus across the web

Answer engines are more confident recommending brands that trusted sources describe consistently. Keep your name, services, locations and key facts identical across your website, Google Business Profile, directories, social profiles and press. Earn mentions in industry publications, comparison articles, reviews and community discussions.

Technical foundations for AEO

• Make sure important content is in the HTML, not only rendered by JavaScript.
• Keep pages indexed in both Google and Bing; submit sitemaps to both.
• Use IndexNow (supported by Bing and others) to notify engines of updates quickly.
• Keep pages fast and free of intrusive interstitials that block content.
• Avoid nosnippet or restrictive max-snippet directives on pages you want quoted.

Optimising for conversational prompts

Prompts are longer and more specific than keywords: “Which accounting software is best for a UK freelancer who invoices in euros?” rather than “accounting software”. To cover them:

• Create content for specific audiences, use cases and constraints.
• Answer comparison and “best for” questions honestly, including when you are not the right fit.
• Collect real questions from sales calls, support tickets and forums.
• Include pricing ranges, requirements and limitations, which prompts often ask about.

How to measure AEO

• AI referral traffic: in analytics, segment sessions from chatgpt.com, perplexity.ai, copilot.microsoft.com and gemini.google.com.
• Prompt tracking: maintain a list of important prompts and regularly record whether your brand is mentioned or cited, and which competitors appear.
• Search Console: AI Overview clicks and impressions are included in web search totals, so watch trends for question-style queries.
• Brand mentions: monitor mentions across publications and communities that engines draw on.
• Assisted conversions: ask new leads how they found you; “ChatGPT recommended you” is becoming a common answer.

Don’t forget the basics

AEO is built on SEO. Pages that are not indexed, load slowly, lack expertise or sit on a site with no authority rarely become sources for any engine. Strong technical SEO, helpful content and genuine reputation remain the foundation. Our guide to the future of AI SEO covers the bigger strategic picture.

A 60-day AEO action plan

Example: turning a page into a quotable answer

Before: a service page opens with three paragraphs about the company’s history and mentions pricing only in a PDF.

After: the page opens with “A residential solar installation in Texas typically costs $X–$Y before incentives, and most systems pay back in N–M years”, cites the data source, then covers what affects cost in a table, installation steps, warranties and FAQs. Each section can be quoted independently, and the facts are specific enough to be useful in an answer.

Content types answer engines cite most often

• Definitions and explainers with a clear one-to-two sentence definition.
• How-to guides with numbered steps.
• Comparisons with honest pros, cons and “best for” recommendations.
• Pricing and cost guides with ranges and the factors that change them.
• Original research and statistics with methodology.
• Glossaries of industry terms, such as our SEO glossary.

Common AEO mistakes

• Blocking search-related AI crawlers in robots.txt by accident.
• Hiding key facts inside PDFs, images or JavaScript widgets.
• Writing marketing copy instead of direct answers.
• Publishing inconsistent prices, locations or services across different sites.
• Measuring only Google rankings and ignoring AI referrals.

Frequently asked questions