What Google actually says
Two Google sources use the term, and both are worth quoting because the wording is narrower than the way the term travels.
From the Search documentation:
"Both AI Overviews and AI Mode may use a 'query fan-out' technique — issuing multiple related searches across subtopics and data sources — to develop a response."
From Google's announcement of AI Mode:
"AI Mode uses our query fan-out technique, breaking down your question into subtopics and issuing a multitude of queries simultaneously on your behalf."
Three details sit in those two sentences, and each one is usually dropped.
It is not only AI Mode. The documentation names AI Overviews first. Anyone treating fan-out as an AI Mode feature is describing half of where it applies.
"May use", not "uses". Google does not commit to it happening on every query.
No number is given. Not in either source. The count of sub-searches is the single most quoted figure about this technique, and it does not come from Google.
The number that is not in the source
A specific range of sub-queries circulates widely in the SEO literature. We looked for it in both Google sources and it is not there: neither figure appears anywhere in the announcement or the documentation, and no other count does either.
Google does give one number, and it belongs to a different feature. Of Deep Search, an AI Mode capability, it says: "It can issue hundreds of searches, reason across disparate pieces of information, and create an expert-level fully-cited report in just minutes."
Hundreds, for Deep Search. Nothing, for ordinary fan-out.
That distinction matters more than it looks. A figure attached to the wrong feature travels further than one attached to none, because it sounds like knowledge. If you are quoting a sub-query count in a deck or a report, it came from an agency article rather than from Google.
The number everyone repeats is not in either source.
What Google writes
“issuing multiple related searches across subtopics
and data sources”
“issuing a multitude of queries
simultaneously on your behalf”
No count. Not once, in either document.
What gets quoted
8 – 12 sub-queries
Traced to a secondary article. Searching both Google documents for “eight” and “twelve” returns nothing.
Why this changes what a page is competing for
Under classical search, a page competes against the query the person typed. Under fan-out, that query may never reach a ranking system at all. What reaches it is a set of subtopics derived from the question, and your page is measured against those.
The practical consequence is uncomfortable, and it is the reason the term is worth knowing: you cannot see the queries you are being judged on. They are generated per question, they are not in Search Console, and they vary with the phrasing a person happened to use.
What you can influence is whether a page answers one subtopic completely rather than several partially. A page that covers eight things in a paragraph each has nothing that fully satisfies any single sub-search. A page that answers one of them properly can be the source for that strand of the answer, even when it has nothing to say about the rest.
How it interacts with what gets cited
Google's documentation adds a sentence that most summaries skip: "While responses are being generated, our advanced models identify more supporting web pages, allowing us to display a wider and more diverse set of helpful links associated with the response."
Read that alongside fan-out and it explains a pattern site owners notice: the pages cited in an AI answer are frequently not the pages that rank for the visible question. They are pages that satisfied one of the invisible sub-searches.
What to do with it
Stop optimising for the question and start covering the subtopics. The question is not what gets searched.
Make one thing complete before adding a second. Depth on a single subtopic beats coverage of many, because the comparison happens per sub-search, not per page.
Do not quote a sub-query count. If you need a number in front of a client, the only one Google publishes is "hundreds" for Deep Search, and using it for ordinary fan-out would be wrong.
Expect citation and ranking to come apart. A page can be cited without ranking for the visible query, and can rank without being cited. Fan-out is the mechanism behind both.
Source
- Google, "AI in Search: Going beyond information to intelligence", blog.google (retrieved 3 September 2026): https://blog.google/products-and-platforms/products/search/google-search-ai-mode-update/. Source of the quoted description of the fan-out technique and of the "hundreds of searches" figure for Deep Search.
- Google Search Central, "AI features and your website" (retrieved 3 September 2026): https://developers.google.com/search/docs/appearance/ai-features. Source of the quoted sentence that both AI Overviews and AI Mode may use the technique, and of the sentence on identifying additional supporting pages while a response is generated.
- The absence of a sub-query count was checked rather than assumed: neither "eight" nor "twelve" nor any other number of sub-queries appears in either source, counted in the retrieved text with "fan-out" (4 occurrences across both) as a control term confirming the retrieval was intact.
Frequently asked questions
Does query fan-out only apply to AI Mode?
No. Google's documentation says both AI Overviews and AI Mode may use it.
How many searches does Google run for one question?
Google does not say. Both published sources describe "multiple related searches" and "a multitude of queries" without a count. The one number Google does give, "hundreds of searches", refers to Deep Search, a separate AI Mode capability.
Can I see the sub-queries in Search Console?
No. Search Console reports the query a person entered, not the searches generated from it.
Does fan-out mean keyword targeting is obsolete?
It means the target is no longer the phrase the person typed. Pages still compete on relevance to a search, but the search is derived rather than entered.
