B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Current
40%
40% -- ai overview appearance lift for Google AI Overviews (2026-09)
Websites implementing complete Tier 1 schema markup experience up to a 40% increase in AI Overview appearances.
- The source notes this is 'up to 40%' rather than an exact fixed increase
Attribution:
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Lighthouse Research Team
Last verified:
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Source verified
Evidence graded
Value
40%
Unit
Percentage
Data Vintage
2026-09
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
50
Source Trust
60
Citation Chain
20
Independence
30
Methodology
45
Freshness
95
Source
Stackmatix
Primary
Tier C
https://maintouch.com/blogs/how-to-optimize-content-for-perplexity-ai ↗
Source Article
Optimize Content for Perplexity AI September 2026
How to Optimize Content for Perplexity AI: Complete Guide September 2026
By Bennett Cohen
Get Maintouch
Turn search and AI visibility work into a repeatable growth system.
Perplexity visits around ten pages per query. It names three to four in the answer and ignores the rest. That's it.
Getting retr…
Original Research
Stackmatix
· Original study ↗
Methodology
Cited from Stackmatix's research
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
Google AI Overviews: 40% ai overview appearance lift. Source: Stackmatix (2026-09). Via Lighthouse Intelligence -- https://lighthousedata.io/data/tier1-schema-ai-overview-lift
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<blockquote cite="https://lighthousedata.io/data/tier1-schema-ai-overview-lift" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>40%</strong> -- ai overview appearance lift for Google AI Overviews<br><small>Source: Stackmatix (2026-09) · <a href="https://lighthousedata.io/data/tier1-schema-ai-overview-lift" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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