Does ChatGPT read your site before it answers?

01Two questions that get confused

Being named and being fetched are separate. An assistant can name your app from what it absorbed during training, without ever requesting your site. It can also fetch your site at answer time and still not name you. Measuring one tells you nothing about the other, and most advice on this subject silently merges them.

The first question we already measure and publish, including the zeroes. This page is the second one: over a fixed window, which crawlers actually requested pages from this domain.

02What arrived, 14 days to 2026-09-21

03OpenAI's answer-time agents never arrived. Perplexity's did.

Operators publish separate agents for separate jobs: one that gathers pages for training, another that fetches a page while answering a live question. Over this window OAI-SearchBot, ChatGPT-User, Claude-User, Perplexity-User, Claude-SearchBot, DuckAssistBot, MistralAI-User registered zero requests — both of OpenAI's answer-time agents among them. PerplexityBot did arrive, 10 times.

So the honest version is not "assistants never fetch" — one of them does, at a volume of about one request a day. It is narrower than that: for this domain, in this window, no agent identifying itself as OpenAI's fetched this site while answering. We first read that as "ChatGPT cannot see our pages". The next section is why that reading was wrong.

The obvious objection is that we blocked them. We did not: OAI-SearchBot, ChatGPT-User, Claude-User, Perplexity-User, Claude-SearchBot, DuckAssistBot, MistralAI-User are each named in our robots.txt with Allow: /, alongside the training crawlers. The zero is their behaviour, not our configuration — check your own robots file before reading your own zero as a finding.

04Zero fetches, and ChatGPT linked to us anyway

On 21 September 2026 we asked ChatGPT, in a temporary chat with memory off, "free tool to check my iOS app's keyword ranking in the App Store". It listed our free rank checker second of five and linked straight to /tools/rank-check, with utm_source=chatgpt.com appended. Our own visit log had been recording arrivals from chatgpt.com for two weeks — two of them went on to create an account.

So the access-log zero and the citation are both true at once. The answer was assembled from a search index ChatGPT already held, not from a live request by an agent announcing itself as OpenAI's. For a site owner the lesson is practical: a zero in your log does not mean you are invisible to ChatGPT, and a citation does not mean it read your page today.

Which index? OpenAI's help centre says ChatGPT search "sometimes partners with other search providers" and points to Microsoft's privacy statement for them — that is Bing. bingbot requested pages here 435 times over the window, all served normally — yet the same day, a Bing search for the exact title of our free-tools comparison returned nothing from this domain. We cannot tell which index produced the citation; we can tell that crawling and indexing are separate steps, and that the second one is where a new site is usually missing.

05A third of all crawler traffic goes to the plain-text twins

Every page here also exists as a Markdown twin at .md.txt, alongside llms.txt and llms-full.txt. Over the same window crawlers requested those twins 788 times out of 2244 AI requests in total — 35% of everything they asked for. HTML content pages took 1083.

We built that layer on the assumption it would be used and had no evidence either way. It is used heavily — not more than the HTML, but at the same order of magnitude, from a layer that costs almost nothing to publish. On this evidence it is not decorative.

06What this does and does not suggest doing

Worth doing

Publish a clean plain-text copy of your pages, keep your own description factual, and make sure the pages that describe your app are the ones a training crawl would find — third-party write-ups more than your own marketing. Then measure again in a month rather than trusting the change.

Get into the search indexes the assistants borrow. Verify the site in Bing Webmaster Tools as well as Google Search Console and submit the sitemap to both — crawled is not the same as indexed, and a page that is not in the index cannot be retrieved for an answer. Then search your own exact page titles there; it is the cheapest check there is.

Not worth doing

Rewriting pages weekly to chase an answer-time fetch that is not happening. Buying a tool that promises to "optimise for ChatGPT" without telling you whether the engine it measures ever requests your domain. And treating a single reading — ours or yours — as a trend.

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