B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Current
91%
91% -- query uniqueness rate for ChatGPT (2026)
91% of ChatGPT's generated search queries are unique across repeated prompt runs.
Attribution:
View source
Lighthouse Research Team
Last verified:
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Source verified
Evidence graded
Value
91%
Unit
Percentage
Data Vintage
2026
Entity
Sample Size
10,000
Geography
Global
Evidence Quality
B
Strong, reliable evidence
Sourced from a well-regarded research firm or industry leader with transparent methodology and a reasonably large sample.
Single source - not yet corroborated
Score breakdown
Extraction
95
Source Trust
60
Citation Chain
20
Independence
30
Methodology
45
Freshness
95
Source
Profound
Primary
Tier A
https://www.tryprofound.com/blog/what-ai-engines-actually-search-for ↗
Source Article
What AI engines actually search for and why ChatGPT never searches the same way twice
When a user types a question into an AI engine, the engine doesn't always search for exactly what was typed. It fans out: sometimes expanding a single prompt into a dozen distinct queries, sometimes departing completely from the original intent. We tracked 10,000 prompts across three major AI engine…
Original Research
Profound
· Original study ↗
Methodology
Tracked 10,000 prompts over 14 days (late March–mid April 2026) across ChatGPT, Perplexity, and Copilot; uniqueness = unique query strings / total query executions
Methodology documented
Segmentation
IndustryAI/ML
RegionGlobal
RoleAll marketers
Channelmulti-channel
Cite this stat
Plain Text
ChatGPT: 91% query uniqueness rate. Source: Profound (2026). Via Lighthouse Intelligence -- https://lighthousedata.io/data/chatgpt-query-uniqueness-2026
HTML Embed
<blockquote cite="https://lighthousedata.io/data/chatgpt-query-uniqueness-2026" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>91%</strong> -- query uniqueness rate for ChatGPT<br><small>Source: Profound (2026) · <a href="https://lighthousedata.io/data/chatgpt-query-uniqueness-2026" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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