ChatGPT does not draw evenly from the web. It skews toward encyclopedic and reference sources: published analyses put Wikipedia at roughly 47.9% of its top citations. ChatGPT answers from model weights first and reaches for the web when the question looks fresh, local or specific. For your own category rather than the published average, Cituna checks daily whether ChatGPT names you, links you, or names a rival without linking anyone.
How ChatGPT actually decides
ChatGPT’s search index is Bing-derived, so a page Bing has never indexed is effectively invisible to ChatGPT, no matter how well it ranks in Google.
In practice that means the surfaces worth auditing first are Wikipedia, established news and reference sites, vendor documentation, G2 and review aggregators.
The method, in order
Start from the skew, not from your site. ChatGPT’s citations concentrate in Wikipedia, established news and reference sites, vendor documentation, G2 and review aggregators.
Separate the sources it cites from the sources it trusts silently. This engine frequently asserts without linking, so the citation list understates what shaped the answer.
Read the citations prompt by prompt, not as one total. A source that appears on your buying questions matters more than one that appears on definitions, and a single count hides the difference.
Check your category specifically. Citation skew is a population-level finding; the sources for legal advice and for developer tooling are not the same, and only your own prompt set tells you which applies.
Audit whether you appear on the top sources at all, then rank the gaps by how hard each is to close: a subreddit comment and a Wikipedia citation are not the same amount of work.
Re-measure after each placement lands. ChatGPT’s volatility is moderate, answers to the same prompt drift week to week as the underlying index refreshes.
The honest caveat
It is the slowest of the six to notice a new page, because a Bing-derived index has to find you first. Sites that only ever submitted a Google sitemap routinely discover they are absent here.
Cituna checks ChatGPT daily alongside Google AI Overviews, Claude, Gemini, Google AI Mode, Perplexity and Grok, on the $39 Starter, and pairs the result with Google Search Console so a change here can be tied to real clicks. Then it does the work: it generates the fix for each gap, its AutoSEO writes and publishes the articles that answer the questions you are missing, and Claude or any other AI agent can work through the results over MCP.
Drafted with AI assistance from our own research and Search Console data, and reviewed by Rahul A before publishing. Rules and prices change; check the linked official source before you act.