B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Current
11%
11% -- cross engine citation overlap rate for AI answer engines (2026)
Cross-engine citation overlap across AI answer engines is around 11%.
Attribution:
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Lighthouse Research Team
Last verified:
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Source verified
Evidence graded
Value
11%
Unit
Percentage
Data Vintage
2026
Entity
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
75
Source Trust
60
Citation Chain
20
Independence
30
Methodology
45
Freshness
95
Source
rctrl.com
Primary
Tier B
https://rctrl.com/blog/hcu-recovery-data-9-months ↗
Source Article
9 Months Without a Single HCU Recovery: The Data
On September 14, 2023, Google started rolling out the Helpful Content Update, and a few weeks later the co-founder of a film review site watched a decade of work start sliding toward zero. Over the next 19 months he hired eight different SEO practitioners. Full audits. "15 actionable improvements." …
Original Research
rctrl.com
· Original study ↗
Methodology
Citation pattern study
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
AI answer engines: 11% cross engine citation overlap rate. Source: rctrl.com (2026). Via Lighthouse Intelligence -- https://lighthousedata.io/data/cross-engine-citation-overlap
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<blockquote cite="https://lighthousedata.io/data/cross-engine-citation-overlap" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>11%</strong> -- cross engine citation overlap rate for AI answer engines<br><small>Source: rctrl.com (2026) · <a href="https://lighthousedata.io/data/cross-engine-citation-overlap" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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