What is answer engine optimisation, and how is it different from SEO?
SEO wins a position on a results page; answer engine optimisation wins a mention inside the answer, where there is often no link to click at all. It is also called AEO, GEO or AI visibility. The assistant searches an index, picks a few pages, fetches them and writes. The business that wins is in the index it searches, is among the pages it picks, and comes out of the rewrite with its name intact.
QuotableSEO wins a position on a results page; answer engine optimisation wins a mention inside the answer, where there is often no link to click at all.
Three names for one job
Answer engine optimisation (AEO), generative engine optimisation (GEO) and AI visibility are three names for the same work: getting a business read and named by ChatGPT, Claude, Perplexity, Gemini and Copilot when a person asks a question it ought to answer. A search engine returns a list. An answer engine returns a paragraph.
The live fetch is the moment that matters. On a UK address-tracing service we launched on 29 September 2026, ChatGPT fetched a page to answer a person 24 times in the fifteen days to 13 October 2026, and not one of those people clicked through (server logs of our address-tracing site, 29 September to 13 October 2026). The answer was given in place; the person took away the name, or not.
What each discipline rewards
| What counts | In SEO | In answer engine optimisation |
|---|---|---|
| JavaScript | Google renders it, eventually | Nothing is rendered. No AI crawler executes JavaScript (Vercel and MERJ crawler study, 2025; our own server logs, 2026). An empty shell is empty to every assistant. |
| Which index | Google, almost entirely | Google and Bing at least. Copilot and DuckDuckGo AI read Bing, ChatGPT leans on it, and Claude reads Brave. |
| Other sites | Backlinks, weighted by authority | Mentions, linked or not. Brand mentions correlate with AI visibility about three times more strongly than backlinks (Ahrefs, 75,000 brands, December 2025). |
| Reviews | A local ranking factor | Part of whether you are named at all. Brands with 80 or more answered reviews appeared in 75% of AI answers, against 1% with none (Seer Interactive for Trustpilot, March 2026, vendor-commissioned). |
Two of these deserve more. On Bing: by 13 October 2026 Bingbot had fetched 105 pages on our address-tracing site against four on Investigation Bureau, our younger private investigation site, and the younger site served 8 answers in eight days to the older site's 27 in fifteen (both sites' server logs). Our reading, and only a reading, is that the Bing gap is part of why. On mentions: 84% of the links assistants cite point at third-party media, not the company's own site (Muck Rack, 25 million cited links, May 2026).
An absent business does not lose a click; it loses the buyer, who heard another firm's name and shortlisted without seeing a results page. The levers that put a page into the reply are not SEO's, and this guide does not list them; on a plan the Audit writes the exact changes for your developer.
What stays the same
Most of the plumbing is shared, and good SEO already does it.
- Crawlability. The index builders that feed the assistants (
OAI-SearchBot,Claude-SearchBot,PerplexityBot,Bingbot,Googlebot) are crawlers like any other. See which AI crawlers to allow in robots.txt. - Being indexed first. Crawled, indexed, then chosen, as it has always been. Our address-tracing site's answers climbed only after ChatGPT's search crawler took 35 of its pages on 9 October 2026; 21 of its 24 ChatGPT answers came in the four days after (server logs of our address-tracing site, 13 October 2026).
- The page, not the site. ChatGPT read our address-tracing site's home page 18 times, likely for brand and category questions, and every other page it read once, each likely for the question that page is about (server logs of our address-tracing site, 29 September to 13 October 2026).
- Trust. What reads as trust to a careful buyer reads as trust to an assistant.
- Patience and cadence. Neither discipline rewards a burst of work followed by silence.
What falls away is keyword density, exact-match anchor text and position itself: the assistant does not show one.
What to measure, and in what order
Answer engine optimisation needs three measures, in this order, because the familiar one comes last and understates everything.
- Answers served, from the server access log. When an assistant fetches a page to reply to a person it announces itself with a user agent:
ChatGPT-Userfor ChatGPT, and its equivalents. Each line is one answer your page was used in, and no analytics tool sees it, because no script runs. Our address-tracing site: 27 answers served in fifteen days, ChatGPT 24, DuckDuckGo AI 2, Perplexity 1 (server logs of our address-tracing site, 29 September to 13 October 2026). Investigation Bureau: 8, all ChatGPT, across 12 pages (investigationbureau.uk server logs, 5 to 13 October 2026). How to know if ChatGPT has read your website gives the commands. - Named or not. Ask the assistants the questions your buyers ask, every day, and record whether you are named, where, and who else is. Only this measure sees the answer itself. The log records the page, not the question, so any question we attach to a fetch is labelled likely; real question text appears only in Bing Webmaster Tools' AI Performance report and Google Search Console's AI report, which showed our address-tracing site 38 impressions inside Google's AI features in the 28 days to 8 October 2026.
- Click-throughs and enquiries, last. The numbers analytics does see, and they are small. Our address-tracing site: 0 in fifteen days (server logs of our address-tracing site, 13 October 2026). Investigation Bureau: 1, on 8 October 2026 (investigationbureau.uk server logs). A London investigation firm whose analytics we read as aggregates only, and do not name, had three years of history and saw more: of 68 visitors sent by assistants between 24 July and 7 October 2026, 8 tapped the phone number, 3 sent the form and one became a £3,300 instruction (its own analytics). Count them, but a report that says "0 visitors from AI" about a site whose pages were used in 27 answers has measured the wrong thing.
What it costs in time
Time comes in three kinds.
- Set-up, once. A fixed list of changes to the site, made once. Where a site is built in a way no assistant can read, that part is a development job, and until it is done the category's answers go to a competitor the assistant can read.
- Rewriting, page by page. The slow part: each page that ought to answer a question is rewritten so that it does. Every week it is not, that question is answered from someone else's page and the buyer takes away someone else's name. On a plan the Audit writes each change out for your developer.
- Waiting, and the weekly read. The crawlers come on their own clock. Investigation Bureau served its first six answers on 8 October 2026, three days after going live (investigationbureau.uk server logs). The London firm went from 14 ChatGPT visitors in August to 43 in September 2026, the month it published an OSINT service page, a technology page and llms.txt; that OSINT page, published on 6 September, was its second most cited page within a month (its own analytics, 7 October 2026). None of it happens without someone reading the log each week and writing the next page.
Two things cost time and return little on their own: schema markup and llms.txt do not move citations in controlled tests (Ahrefs, May 2026; Google, June 2026); what is llms.txt and does it help says why. For the month-by-month picture, see how long it takes to get cited.
Where to start
Run the free check: it fetches your home page and machine files live, as a browser, as ChatGPT-User and as GPTBot, so an edge block shows as a block. Then read your access log for the user agents above; if it is empty, why does ChatGPT not mention my business gives the three reasons in order. The check and the guides diagnose. On a plan the Audit writes the exact changes for your developer, numbered and ready to paste; the plans are on the pricing page. If you would rather we did the counting and the writing, that is how we work.