B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Current
31%
31% -- attention degradation for RAG retrievers on passages over 300 words (2026)
Passages over 300 words trigger a 31% attention degradation in RAG retrievers.
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Lighthouse Research Team
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Evidence graded
Value
31%
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
50
Source Trust
60
Citation Chain
20
Independence
30
Methodology
45
Freshness
95
Source
GEO-SFE benchmark
Primary
Tier C
https://www.theanswerengine.ai/blog/how-ai-search-engines-rank-content ↗
Source Article
How AI Search Engines Rank Content
The Composite Score Equation: every AI search engine ranks content with a hybrid score that multiplies semantic similarity, authority weight, and structural extractability — three factors in a single formula, not a single ranking algorithm (GEO-SFE, 2026). The implication is direct: Answer Engine Op…
Original Research
GEO-SFE benchmark
· Original study ↗
Methodology
GEO-SFE benchmark (2026) as cited by The Answer Engine
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
RAG retrievers on passages over 300 words: 31% attention degradation. Source: GEO-SFE benchmark (2026). Via Lighthouse Intelligence -- https://lighthousedata.io/data/rag-attention-degradation-31
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<blockquote cite="https://lighthousedata.io/data/rag-attention-degradation-31" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>31%</strong> -- attention degradation for RAG retrievers on passages over 300 words<br><small>Source: GEO-SFE benchmark (2026) · <a href="https://lighthousedata.io/data/rag-attention-degradation-31" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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