AI search visibility is how often ChatGPT, Perplexity, Copilot and Google's AI Overviews mention and cite your brand when buyers ask about your market. You earn it in three moves: let each engine's search crawler reach your site, publish pages that answer buyer questions plainly enough to quote, and keep your facts consistent everywhere. Then measure it with a fixed prompt list. Nobody can sell you a guaranteed citation.
This guide covers what each engine actually reads, the robots.txt rules that decide whether you can appear at all, how to write a page AI engines lift from, and a 30-day plan to measure where you stand using free, first-party reports.
01Why AI search visibility matters for B2B brands
Your buyers have already moved. In January 2026, Forrester reported that 94% of business buyers use AI in their buying process, up five points in a year. The same research found that 61% use private AI tools provided by their organisation, and that business buyers are four times as likely as consumers to use Microsoft Copilot.
At the same time, the click is shrinking. Pew Research Center tracked the browsing of 900 US adults in March 2025 and found that people clicked a traditional search result in 8% of visits when Google showed an AI summary, against 15% when it did not. Links inside the summary itself were clicked in just 1% of those visits.
Put those together and the shortlist increasingly forms inside an AI answer, before anyone visits your site. If you are not named in that answer, you are not on the list. That is the commercial case, and it is stronger in B2B than anywhere else, because one shortlist can be worth a year of revenue.
02How do ChatGPT, Perplexity, Copilot and Google choose what to cite?
They do not share one index, so there is no single "AI ranking". Each engine retrieves pages through its own crawler or search partner, then picks the passages that best answer the question.
| Engine | What it retrieves from | Crawler or control that matters |
|---|---|---|
| Google AI Overviews and AI Mode | Google's own Search index | Googlebot, plus normal snippet controls |
| ChatGPT search | OpenAI's search crawler | OAI-SearchBot |
| Claude | Anthropic's search crawler and live fetches | Claude-SearchBot and Claude-User |
| Perplexity | Perplexity's own crawler | PerplexityBot |
| Microsoft Copilot | Bing's index | Bingbot, measured in Bing Webmaster Tools |
Google: good SEO, with a wider net
Google is blunt about this. Its guidance on AI features says there are no additional requirements and no special optimisations needed to appear in AI Overviews or AI Mode. A page only has to be indexed and eligible to show with a snippet.
The important detail is what Google calls query fan-out: the AI features issue multiple related searches across subtopics to build an answer. That changes who gets cited. Ahrefs found in March 2026 that 38% of AI Overview citations came from pages ranking in the top 10 for the query, down from about 76% in its July 2025 study. The analysis covered 863,000 keyword results and 4 million cited URLs.
In plain terms: ranking still helps, but a page that answers a precise sub-question well can be cited for a broader query it does not rank for.
ChatGPT, Gemini, Copilot and Perplexity: even further from page one
The assistants overlap with Google's top results even less. In an Ahrefs study of 15,000 long-tail queries, only 12% of the links cited by ChatGPT, Gemini and Copilot appeared in Google's top 10 for the same prompt. Perplexity was the closest match, at 28.6%.
So you cannot assume that your Google rankings carry over. You have to check each engine separately, which is why measurement comes later in this guide.
03Which AI crawlers should you allow in robots.txt?
If an engine's search crawler cannot reach your site, nothing else in this guide matters. A common failure is a blanket "block AI bots" rule, added to stop training, that also blocks the bots that would cite you.
The key is that each company separates training from search, and you can choose differently for each:
- OpenAI. OpenAI's crawler documentation says OAI-SearchBot surfaces websites in ChatGPT's search features, and that sites which opt out of it will not be shown in ChatGPT search answers. GPTBot is the training crawler. Changes take about 24 hours to apply.
- Anthropic. Anthropic's crawler page lists three bots. Blocking Claude-SearchBot stops your content being indexed for search, blocking Claude-User stops Claude fetching your pages when a user asks, and ClaudeBot covers training.
- Perplexity. Perplexity's documentation says PerplexityBot surfaces and links websites in its results and is not used to train foundation models. Perplexity-User handles user-requested fetches.
- Google. AI Overviews run on the normal Search index. To limit what appears, Google points to the same controls as ordinary Search (nosnippet, data-nosnippet, max-snippet and noindex). Google-Extended is a separate token that limits use in some of Google's other AI systems.
My default for a B2B site that wants to be found: allow every search and user-fetch crawler, and make a deliberate decision on the training crawlers rather than inheriting one from a plugin. We allow all of them on our own site, because a sales-led business benefits from being known.
Blocking AI search crawlers to protect your content is like taking your number out of the phone book to avoid cold calls. It works, and nobody finds you.
Baz Furby
Check one thing beyond robots.txt: your CDN or firewall. Bot protection rules can block these crawlers before robots.txt is ever read, and you will not see it unless you look at your server logs.
04How to write pages that AI engines quote
Once the crawlers can reach you, the question becomes whether your page is the easiest trustworthy thing to lift. In our experience building and auditing B2B sites, five things make the difference.
- Answer first. Open with a 40 to 80 word paragraph that answers the question directly and names the topic. Engines extract passages, and a self-contained answer at the top is the easiest passage to extract. Our guide to what B2B lead generation costs in the UK is built this way.
- Phrase headings as the questions buyers ask. "How much does a fractional CMO cost?" matches the sub-queries an engine fans out into far better than "Pricing".
- Put specific facts on the page. Prices, timelines, named sources and worked examples. A vague page gives the engine nothing to cite, and B2B buyers ask specific questions.
- Make it readable without JavaScript. Serve the main content as HTML from the server. A page that only renders in a browser is a gamble with every crawler that is not Googlebot.
- Mark it up. Organisation, article, service and FAQ structured data tells machines who you are and what the page is about. It does not guarantee a citation, but it removes ambiguity.
Keep your facts consistent everywhere
Engines cross-check. If your website says you serve fintech, your LinkedIn page says martech and a directory listing from 2021 says something else, you are harder to describe confidently. Pick one description of what you do, who for and where, and make it match across your site, LinkedIn, Companies House, review platforms and partner listings. We go deeper on this entity layer in agentic SEO: why AI agents are the new search engine.
Get mentioned where engines look
Your own site is one source. Engines also cite comparison articles, industry press, communities and review sites. For B2B, the practical moves are trade press commentary, podcast appearances with published show notes, partner pages and honest reviews from clients. None of this is new. What is new is that it now shapes the answer, not just the referral traffic.
05How to measure AI search visibility in 30 days
You cannot improve what you have not baselined, and AI answers vary from run to run. So measure a fixed set of prompts on a fixed schedule rather than trusting one screenshot.
Week 1: build the prompt set
Write 20 to 30 prompts a real buyer would type. Mix three kinds:
- Category prompts: "best B2B lead generation agencies in the UK".
- Problem prompts: "how do I get more qualified meetings without hiring SDRs".
- Brand prompts: "what does [your company] do" and "[your company] vs [competitor]".
Week 2: run the baseline
Run every prompt in ChatGPT, Perplexity, Copilot, Claude and Google with AI Mode or an AI Overview showing. Log four things for each: were you mentioned, were you cited with a link, which competitors appeared, and was the description of you accurate. In our experience, inaccurate descriptions are often the fastest win, because they tend to trace back to an outdated page somewhere.
Week 3: add the first-party data
Two free reports are worth setting up now:
- Google Search Console. Google says traffic from AI Overviews and AI Mode is included in the Performance report under the Web search type. It is not split out, but it is counted.
- Bing Webmaster Tools. In February 2026, Microsoft launched an AI Performance report showing how often your pages are cited in Microsoft Copilot, Bing's AI summaries and select partner integrations, with page-level citation counts and a sample of the grounding queries behind them.
The Bing report is easy to overlook, and it is the closest thing to first-party citation data we have found. Given how heavily business buyers use Copilot, I would set it up before anything else.
Week 4: fix and schedule
Fix the crawler and accuracy problems you found, publish or rewrite the two or three pages that match the prompts where competitors are cited and you are not, then rerun the full set monthly. Track the share of prompts where you are mentioned. That single number is your AI search visibility score.
If you would rather automate the tracking, we built Surfaceable for exactly this job. It is our own product, so read this as us describing our tool: it audits technical SEO and tracks how often brands appear when people ask ChatGPT, Claude, Gemini and Perplexity. A spreadsheet works fine to start.
06What does not work (and what to skip)
A few things get sold as AI search visibility tactics that I would not spend money on:
- Guaranteed citations. Nobody outside the engine controls which sources it cites. Anyone promising specific citations is guessing or gaming.
- Mass-produced AI content. Hundreds of thin pages give an engine nothing new to quote. One useful page beats twenty generic ones.
- Treating llms.txt as a lever. The llms.txt proposal is a sensible way to give AI tools a curated map of your site, and we publish one. But none of the crawler documentation cited above mentions it. Add it in an afternoon, then move on.
- Hiding content behind forms. Gated PDFs cannot be cited. Publish the substance and gate the template or tool instead.
The work that does move AI search visibility is unglamorous: crawler access, clear pages, consistent facts and patient measurement. It is the core of our AI SEO and websites work, and it compounds, because every accurate page you publish becomes another passage an engine can use.
07Frequently asked questions
How do I get my website cited by ChatGPT?
Make sure OpenAI's search crawler, OAI-SearchBot, is allowed in your robots.txt, because OpenAI says sites that opt out of it will not be shown in ChatGPT search answers. Then publish pages that answer specific buyer questions directly, with clear headings, named sources and facts that are consistent across the web. There is no way to buy or guarantee a citation.
Do I need to do anything special to appear in Google AI Overviews?
Google says there are no additional requirements or special optimisations for AI Overviews or AI Mode. A page needs to be indexed and eligible to show with a snippet in normal Search. In practice, that means the fundamentals of good SEO, plus content that answers the related sub-questions a query fans out into.
Does blocking GPTBot remove my site from ChatGPT?
No. OpenAI says GPTBot relates to training its foundation models, while OAI-SearchBot is the crawler that surfaces sites in ChatGPT's search features. You can block training and still allow search, or the other way round, because each user agent is controlled separately in robots.txt.
How do I measure AI search visibility?
Start with a fixed list of 20 to 30 buyer prompts, run them in each engine every month, and log whether you are mentioned, cited and described accurately. Add the free first-party data: Google Search Console includes AI Overviews and AI Mode traffic in its Performance report, and Bing Webmaster Tools has an AI Performance report covering citations in Copilot and Bing's AI summaries.
Does my website need an llms.txt file?
It is cheap to add and does no harm, which is why we publish one. But llms.txt is a proposal, first published in September 2024, not a requirement. None of the crawler documentation from Google, OpenAI, Anthropic or Perplexity that we cite in this article mentions it, so treat it as a tidy extra, not a ranking lever.