Query fan-out means running several related searches at once to gather more results; a question about lawn weeds may also search herbicides and weed prevention.
Google Search Central · Day 1 · How Search works and where's AI?
Thing · Concept
Query fan-out
Running several related searches at once to gather material for an AI answer, as AI Mode and AI Overviews do.
- Claims
- 29
- In Google’s docs
- 4
- Said at the event
- 21
- Not in docs
- 4
- Kit items
- 9
Glossary · Query fan-out
Running several related searches at once to gather more results for an AI answer; a question about lawn weeds may also search herbicides and weed prevention. In Google's AI features an LLM generates the fan-out queries, and each goes through the same query understanding as a typed query; Google said they are not added to Search Console.
Google’s documentation 4
Documented in
Google's guide says creating separate content for every variation of how people might search, including fan-out queries, primarily to manipulate rankings or AI responses violates its scaled content abuse policy. It adds that its AI systems can understand a page's relevance even without an exact match to the query.
Google Search Central · Day 1 · How Search works and where's AI?
Google says query fan-out in AI Overviews and AI Mode issues related searches across subtopics and several data sources, which for AI Mode include the Knowledge Graph and shopping data as well as web content (AI Mode launch post, March 2025).
Google Search Central, Google blog (5 March 2025) · Day 2 · How does the index look like?
Google's July 2025 blog post introduced Web Guide as a Search Labs experiment that uses a custom version of Gemini and a query fan-out technique to group web links by aspects of the query.
Google blog (24 July 2025) · Day 3 · Wrapping all up: AI, Search, and making sense of everything.
Said at the event 21
Slide and stage claims that name it, the ones Google’s documentation does not cover first.
Label
Grade
Day
Not in docs 4
A community speaker cited a third-party study (heard as Peec AI's) finding that 43% of prompts produced fan-out queries in a language other than the one the user searched in.
Thiago Pojda · Day 1 · Lightning session A: Automation and AI
A community speaker showed a Spanish-language AI prompt about places to eat in Barcelona whose fan-out queries were all in English, so the content used to answer may be written by and for a different audience than the one asking.
Thiago Pojda · Day 1 · Lightning session A: Automation and AI
Google said a short video showing how one query is expanded into several fan-out queries has been in its documentation for a while.
John Mueller · Day 3 · Making sense of users' queries
Google said fan-out queries are not added to Search Console, because Google considers them part of its infrastructure.
John Mueller · Day 3 · Making sense of users' queries
Consistent with docs 12
Google said the Gemini model lets Search understand the user's intent, and query fan-out then adds further queries to the first one to enrich the quality of the answer.
Lino Cattaruzzi · Day 1 · Welcome and opening keynotes
Consistent with docsD1-C038
AI Mode and AI Overviews use the same crawling and the same index as Search. At serving they add grounding on the Search index and query fan-out.
Google said query fan-out is nothing new: it fires, for example, ten different searches in the background, each a normal search on the same systems.
Gary Illyes · Day 1 · How Search works and where's AI?
Google said that when AI Overviews or AI Mode run a query fan-out, the generated queries are sent to Google's Search index and documents come back with their snippets, which then feed the AI-generated answer (part of this passage is unclear in the recording).
Google expands queries with synonyms in traditional Search; the speaker compared this to query fan-out but said it is part of traditional Search, not of the AI features.
John Mueller · Day 3 · Making sense of users' queries
Consistent with docsD3-C057
Google's slide on how LLM features with grounding generally work showed a query going to both the search engine and an LLM, the search engine's results going to the LLM, the LLM generating fan-out queries that go back to the search engine, and the LLM returning answers with links.
John Mueller · Day 3 · Making sense of users' queries
Google treats fan-out queries generated by the LLM the same way as queries typed by users, so understanding how normal queries work explains fan-out queries too.
John Mueller · Day 3 · Making sense of users' queries
Google tries to make fan-out queries distinct from each other for better coverage, avoiding asking the same question several times, which would return the same answers.
John Mueller · Day 3 · Making sense of users' queries
Every fan-out query goes through Google's query understanding, including synonym expansion.
John Mueller · Day 3 · Making sense of users' queries
Individual fan-out queries can be seen in some other places, such as Gemini, some search APIs and other LLM systems.
John Mueller · Day 3 · Making sense of users' queries
Because every system runs fan-out differently, Google advised understanding that fan-out happens but not overfocusing on individual fan-out queries or on how to rank for them.
John Mueller · Day 3 · Making sense of users' queries
Consistent with docsD3-C071
Google's summary slide on query understanding said query fan-out does even more expansion than synonym expansion.
John Mueller · Day 3 · Making sense of users' queries
Confirmed by docs 2
Google's fan-out example: for a simple query about getting rid of weeds in a lawn, Search also looks for the best herbicide to use, the best non-chemical solution and how to prevent weeds.
Lino Cattaruzzi · Day 1 · Welcome and opening keynotes
Confirmed by docsD1-C051
Three reasons were given: generative AI features are built directly on the core ranking systems, query fan-out expands the original query to find related information, and generative AI features highlight content indexed by Google Search.
Nothing to verify 3
StageD1-C292
A community speaker suggested that LLMs pick up some of Google's years of work on judging honesty and trust (E-E-A-T) by proxy, because they send many queries (probably fan-out queries) to search engines.
Thiago Pojda · Day 1 · Lightning session A: Automation and AI
StageD1-C307
A community speaker proposed a 'brand co-occurrence rate' for the search stage: the share of an AI's fan-out queries that contain the brand (one in three is 33%), which also hints at the associations the model already has; problems there are mostly relevance problems.
StageD3-C704
Google warned that shiny new things, such as trying to work out fan-out queries, distract from the real mission of creating helpful content, since Search is just piping that connects users to information.
Gary Illyes · Day 3 · Wrapping all up: AI, Search, and making sense of everything.
Press and analysis 4
AnalysisD1-C504
The study cited on stage matches Peec AI's analysis (reported in February 2026) of over 10 million ChatGPT prompts and 20 million fan-outs: 43% of the fan-out searches for non-English prompts ran in English, and nearly 78% of non-English prompt runs had at least one English fan-out (from 66% for Spanish to 94% for Turkish), so the 43% is a share of fan-out searches, not of prompts.
Ibrahim Anjro · Day 1 · Lightning session A: Automation and AI
AnalysisD3-C066
Do not build pages for fan-out queries copied from Gemini or other LLM tools: they differ from system to system and Search Console does not report them. Cover a topic's real subquestions on solid pages instead.
Ibrahim Anjro · Day 3 · Making sense of users' queries
AnalysisD3-C095
No Google documentation states that fan-out queries stay out of Search Console, but the docs fit the stage statement: the Performance report counts AI Overviews and AI Mode under the user's own queries, and the Generative AI reports have no query dimension.
Ibrahim Anjro · Day 3 · Making sense of users' queries
AnalysisD3-C213
Tactics sold as AI visibility or GEO, such as hidden text aimed at AI answers, mass-produced pages for fan-out queries or keyword-stuffed passages, are judged under the same spam policies as classic ranking manipulation.
Ibrahim Anjro · Day 3 · How Google thinks about Quality
Built on these claims 9
Kit items about Query fan-out: their own words name it, or several of the claims they rest on do.
Developer requirements 2
Structure content for readers instead of splitting it into small chunks for AI
Rests on 9 claims, 4 of them naming Query fan-out; its own words name Query fan-out
Keep pages indexable and snippet-eligible, the whole technical requirement for AI features
Rests on 5 claims, 2 of them naming Query fan-out
Also instory angle A-001glossary terms Query fan-out, AI Mode, AI Overviews, Grounding, Scaled content abuse, Web Guide
Connected things 14
Relations
- Used by AI Mode
3 claims, 3 documented
- Consistent with docsD1-C038
AI Mode and AI Overviews use the same crawling and the same index as Search. At serving they add grounding on the Search index and query fan-out.
Google said that when AI Overviews or AI Mode run a query fan-out, the generated queries are sent to Google's Search index and documents come back with their snippets, which then feed the AI-generated answer (part of this passage is unclear in the recording).
Google says query fan-out in AI Overviews and AI Mode issues related searches across subtopics and several data sources, which for AI Mode include the Knowledge Graph and shopping data as well as web content (AI Mode launch post, March 2025).
- Used by AI Overviews
3 claims, 3 documented
- Consistent with docsD1-C038
AI Mode and AI Overviews use the same crawling and the same index as Search. At serving they add grounding on the Search index and query fan-out.
Google said that when AI Overviews or AI Mode run a query fan-out, the generated queries are sent to Google's Search index and documents come back with their snippets, which then feed the AI-generated answer (part of this passage is unclear in the recording).
Google says query fan-out in AI Overviews and AI Mode issues related searches across subtopics and several data sources, which for AI Mode include the Knowledge Graph and shopping data as well as web content (AI Mode launch post, March 2025).
Most often named with it
Things named in the same claim, with the number of claims they share.
- AI Mode 4
- AI Overviews 4
- Gemini 4
- Search Console 3
- Grounding 2
- Query understanding 2
- E-E-A-T 1
- Generative AI performance report 1
- GEO 1
- Performance report 1
- Scaled content abuse 1
- Snippets 1
Topics that feature it
- Query fan-out 28
- SEO vs GEO 6
- Measuring AI visibility and brand impact 4
- Content for people 3
- Localisation beyond translation 3
- Query understanding 3
- Measuring success in the AI era 2
- The pipeline: crawling, indexing, serving 2
- Gemini and Search 1
- How Search is evolving 1
- Spam policies and manual actions 1
- What the index looks like 1