Query Fan-out
The number of sub-queries or downstream requests that a system issues in response to a single user query.
What is Query Fan-out?
Query Fan-Out refers to the number of sub-queries or downstream requests that a system issues in response to a single user query.
When a user submits one query (for example, to a search engine or LLM), the system may 'fan it out' into multiple smaller queries sent to various back-end services, indexes, APIs, or databases — and then aggregate all the results before returning an answer.
In large language model-based systems (like ChatGPT, Claude, Perplexity, or Arc Search):
• Query fan-out indicates how many sources or documents are retrieved for one user query.
• In RAG (Retrieval-Augmented Generation) systems, it's often the number of document 'chunks' fetched from a vector database. Example: retrieving the top-20 most relevant passages → fan-out = 20.
• In AI search engines (e.g., Perplexity), fan-out may reach hundreds of simultaneous web queries to gather diverse evidence before synthesis.
How Qwairy Makes This Actionable
Qwairy's Search Intelligence feature reveals the query fan-out patterns of AI platforms. When you monitor a core query, discover which sub-queries and related searches AI systems generate behind the scenes. This intelligence helps you create content targeting not just the main query, but the entire fan-out of related searches AI platforms use to build comprehensive answers.
Frequently Asked Questions
Related Terms
RAG(Retrieval Augmented Generation)
AI architecture that retrieves relevant information from external sources in real-time before generating responses.
Prompt
Question or query asked to an LLM to obtain a generated response.
Perplexity
Conversational search engine that combines LLM and real-time web search with source citations.
Source Citation
Reference to a URL or website as a source of information in an AI-generated response.
ChatGPT
Conversational assistant developed by OpenAI, based on GPT models. One of the most used LLMs in the world.