B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Recent
5
5 -- average publication year shift of top ranked passages for LLM-based rerankers (2025)
When LLM rerankers reordered search results with timestamps added, the average publication year of top-ranked passages shifted forward by as much as 4.78 years.
- Maximum observed shift ('by as much as 4.78 years') across tested LLM-based rerankers
Attribution:
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Lighthouse Research Team
Last verified:
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Source verified
Evidence graded
Value
5
Unit
Duration Years
Data Vintage
2025
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
60
Freshness
95
Source
resollm.ai
Primary
Tier B
https://resollm.ai/blog/do-llms-favor-recent-content/ ↗
Source Article
Do Large Language Models Favor Recent Content?
Two search results that say the same thing. Same wording. Same meaning.
The only difference is that one looks “newer” because it has a recent-looking date at the top.
Researchers recently tested whether that single cue is enough to sway large language models. They took identical passages and changed…
Original Research
resollm.ai
· Original study ↗
Methodology
Controlled experiment: identical passages with and without a 'Published on:' timestamp prefix run through LLM-based rerankers
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
LLM-based rerankers: 5 average publication year shift of top ranked passages. Source: resollm.ai (2025). Via Lighthouse Intelligence -- https://lighthousedata.io/data/llm-recency-bias-year-shift-4-78
HTML Embed
<blockquote cite="https://lighthousedata.io/data/llm-recency-bias-year-shift-4-78" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>5</strong> -- average publication year shift of top ranked passages for LLM-based rerankers<br><small>Source: resollm.ai (2025) · <a href="https://lighthousedata.io/data/llm-recency-bias-year-shift-4-78" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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