LMArenaUnfurlBot
LM Arena link preview bot
About this crawler
LMArenaUnfurlBot is a web crawler identified by the regular-expression pattern LMArenaUnfurlBot in the User-Agent request header. It is categorised as social-preview. Use the regex above to detect, log, allow, or block LMArenaUnfurlBot traffic in your web server, CDN edge rules, or robots.txt.
Block-rate · top 25k sites
No block-rate data for this crawler.
Technical details
- Name
- LMArenaUnfurlBot
- Pattern
LMArenaUnfurlBot- Tags
- social-preview
- Reference
- https://arena.ai/
- Added
- 2026/04/26
- Instances
- 1 known sample(s)
Sample User-Agent strings
LMArenaUnfurlBot/1.0 (Link preview bot for AI model comparison platform; +https://lmarena.ai) Mozilla/5.0 (compatible)
Block this crawler
robots.txt — disallow LMArenaUnfurlBot:
User-agent: LMArenaUnfurlBot
Disallow: /
Apache .htaccess — return 403:
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} LMArenaUnfurlBot [NC]
RewriteRule .* - [F,L]
Nginx — return 403 inside a server block:
if ($http_user_agent ~* "LMArenaUnfurlBot") {
return 403;
}
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