What is query fan-out in AI search?

Query fan-out is when an AI generates multiple search queries from a single user prompt. Instead of one search, the AI fans out across related variations to gather comprehensive answers.

How many searches does ChatGPT run per prompt?

Based on our analysis of 102,018 queries: ChatGPT averages 3.51 searches per prompt, with 67.3% of prompts triggering multiple queries.

Does Perplexity use query fan-out?

Yes, but less frequently. Perplexity generates 2.24 queries per prompt on average, with 70.5% of prompts resulting in a single query. Its search-first architecture prioritizes precision over exploration.

What triggers query fan-out?

Certain keywords dramatically increase fan-out: 'List' triggers 49 queries on average (13.9x multiplier), 'Top' triggers 8.4 queries (2.4x multiplier), 'Best' triggers 3.7 queries (1.1x multiplier), 'What is' triggers 1.96 queries (minimal fan-out).

Is query fan-out stable over time?

No. Our data shows single-query prompts declined from 65.4% (October) to 40.8% (November 2025). AI search is evolving toward more multi-query behavior.

How do I optimize content for query fan-out?

Depends on your audience's AI: For Perplexity users, focus on ranking #1 for the core query. For ChatGPT users, achieve 100% coverage across all semantic variations. Check your analytics to see which AI your audience uses.

What's the difference between query rewriting and fan-out?

Query rewriting transforms a single prompt into a single optimized query. Query fan-out generates multiple queries from one prompt. Both happen, but fan-out creates the visibility multiplier effect.

Why does ChatGPT generate more queries than Perplexity?

Architecture. ChatGPT is conversation-first (explores multiple angles). Perplexity is search-first (minimizes queries for precision). Different tools, different behaviors.

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Query Fan-Out: ChatGPT Runs 3.5x More Searches Than Perplexity (102K Queries Analyzed)

Luca Fancello & Nicolas Ilhe•December 14, 2025•Updated Dec 21, 2025•15 min read•

Research

Analysis of 102,018 AI queries reveals the truth: query fan-out varies by provider. Perplexity: 70.5% single-query. ChatGPT: 32.7% single-query. This provider-specific behavior is the hidden factor determining who wins in AI search.