ChatGPT names companies, sources and experts for different reasons. What happens behind the search decides who shows up and why the same question does not always lead to the same answer.
01. What you ask is not what you get
You ask ChatGPT a question. But ChatGPT does not have to search the web using those exact words.
With ChatGPT Search, a user’s question can be rewritten into one or more targeted search queries. After reviewing the first results, ChatGPT can run additional, more specific searches. OpenAI calls this query rewriting.
That matters for visibility. One visible question can quickly turn into a much larger search space. Ask for an “AEO agency for law firms,” and ChatGPT may search for terms and combinations that look very different from the original prompt.
Your question is only the starting point. The actual search can go somewhere else.
Sources
OpenAI: ChatGPT Search
02. Your ChatGPT is not my ChatGPT
Chatty calibrates to the conversation.
The conversation you are already having changes how a new question is understood. Add Memory, and more stored context can enter the picture. When ChatGPT searches the web, that context can even affect the search query it creates.
OpenAI documents this for Memory: relevant stored information can be used when a search query is rewritten. Approximate location can also be taken into account to make searches more specific.
So two people can ask the same question and still take different paths through search.
ChatGPT does not answer your question in isolation. It answers in context.
That is also why the same prompt can produce a different result in a fresh chat than it does halfway through a long conversation.
Sources
OpenAI: ChatGPT Search
03. ChatGPT and Bing: Just the two of us?
Bing plays a real role in ChatGPT Search.
OpenAI explicitly documents Microsoft Bing as a search provider in some ChatGPT Search contexts. Its general Search documentation also refers to external search providers in the plural.
So yes:
Bing matters. But Bing is not ChatGPT.
An entity’s official domain does not have to be in the Bing index for ChatGPT to resolve the entity correctly. We tested this ourselves.
There is another piece to the puzzle. OpenAI also operates OAI-SearchBot, its own search crawler. If you block it, your page content cannot be crawled for summaries and snippets in ChatGPT Search. At the same time, OpenAI can still discover URLs through third-party search providers or links from other crawled pages.
That makes the picture a lot more interesting than “ChatGPT uses Bing.”
ChatGPT can use its own crawler, work with external search providers and rewrite the query before the search even begins.
If you only look at Bing, you are only looking at part of the search.
Sources
OpenAI: ChatGPT Search
OpenAI: ChatGPT Search for Enterprise and Edu
OpenAI: Publishers and Developers FAQ / OAI-SearchBot
richresults.ai: Google Found the Pages. ChatGPT Found the Entity.
04. Found. Cited. Recommended. Same same but different
If ChatGPT finds a page, that does not mean the page will appear in the answer.
If a page is cited, that does not mean the company behind it will be recommended.
And if a company is mentioned, its own website does not automatically have to be the visible source.
Those are different outcomes.
For a business, that creates three very different questions:
Am I being found?
Am I being used as a source?
Am I actually being mentioned or recommended?
They may sound similar. In AEO, they are not.
A strong expert page can become a cited source without turning the brand itself into a recommendation. And a company can appear in an answer while the visible citation points somewhere else.
Visibility is not automatically citation. Citation is not automatically recommendation.
Which leads directly to the next question:
Why does ChatGPT recommend one company and leave another one out?
Sources
OpenAI: ChatGPT Search
OpenAI: Publishers and Developers FAQ
05. When the shit hits the fan-out. Why everyone is talking about Query Fan-Out
Query Fan-Out has become one of AI Search marketing’s favorite terms.
The problem is that it is now often used for almost any kind of AI-powered search behavior.
Google means something fairly specific by it. In AI Mode, Google can break a complex question into subtopics and run multiple searches in parallel. Google explicitly calls this Query Fan-Out.
For ChatGPT, OpenAI documents a different term: query rewriting. A user’s question can be rewritten into one or more targeted searches, followed by additional, more specific searches.
Looks similar? Sure.
Does that make everything Query Fan-Out? No.
That distinction matters.
Google uses Query Fan-Out as a specific term for its search process. OpenAI describes ChatGPT Search differently. If every multi-query search process gets labeled “fan-out,” a useful product term turns into a catch-all theory.
And suddenly Query Fan-Out explains everything.
Or nothing at all.
Sources
Google: AI Mode / Query Fan-Out
OpenAI: ChatGPT Search