What is Query fan-out?
Also called: Fan-out search
With query fan-out, an AI search breaks a question into several sub-questions, searches for each one separately and combines the results into one answer.
Example
For “Which e-bike suits commuting?” the system searches separately for range, weight, price and reviews, then sums everything up.
For pros
Google names the technique explicitly for AI Overviews and AI Mode. Deep research tools use similar steps, and the GEO paper already describes a model that rewrites the question before searching. For site owners this means a page can match a sub-question that nobody ever typed in that form. Which sub-searches a system runs is not visible from the outside.
Related prompts, skills, agents and tools
Written by AI Compare Ninja with AI assistance and edited by us. Every explanation is our own text.