B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Current
34.82%
34.82% -- crawl 404 error rate for ChatGPT crawler (2026-04)
ChatGPT encounters a 34.82% 404 error rate per crawl on JavaScript-only pages.
Attribution:
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Lighthouse Research Team
Last verified:
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Source verified
Evidence graded
Value
34.82%
Unit
Percentage
Data Vintage
2026-04
Entity
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
75
Source Trust
60
Citation Chain
20
Independence
30
Methodology
45
Freshness
95
Source
Vercel
Primary
Tier B
https://betteraisearch.com/tactics/server-side-rendering-llm ↗
Source Article
Server-Side Rendering SEO for AI Crawlers
Original Research
Vercel
· Original study ↗
Methodology
Vercel analysis of AI crawl logs; GSQi controlled experiment corroborated
Methodology documented
Segmentation
IndustryAI & Machine Learning
RegionGlobal
RoleAll marketers
Channelmulti-channel
Cite this stat
Plain Text
ChatGPT crawler: 34.82% crawl 404 error rate. Source: Vercel (2026-04). Via Lighthouse Intelligence -- https://lighthousedata.io/data/chatgpt-404-error-rate-js-pages-2026
HTML Embed
<blockquote cite="https://lighthousedata.io/data/chatgpt-404-error-rate-js-pages-2026" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>34.82%</strong> -- crawl 404 error rate for ChatGPT crawler<br><small>Source: Vercel (2026-04) · <a href="https://lighthousedata.io/data/chatgpt-404-error-rate-js-pages-2026" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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