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Domain Due Diligence

Report for Lmarena.ai

Report Date
November 28, 2025
Recommendation
Caution
Overall Summary
Suspicious
  Why we think so? 

LMArena.ai is a widely used platform that benchmarks AI models through user preference voting. It attracts over 22 million visits monthly, mainly from India and the US, ranking #1,845 globally in technology software. The domain is secure with valid SSL, operated under Cloudflare, and has confirmed contact emails and social profiles. Trademark filings confirm Arena Intelligence, Inc. as the legal entity. However, the platform faces serious controversy over fairness, with studies showing it systematically favors large AI providers by allowing them private access to multiple model variants. Despite this, LMArena is not a scam but remains under scrutiny for ranking transparency and competitive integrity.

Confidence Score Our overall confidence rating for this entity based on public signals, activity, and risk checks.
78%

Risk Insights

🛡️

High Traffic and Strong Security

  • Over 22 million monthly visits, mainly from India and the US.
  • Valid SSL certificate issued recently and active Cloudflare DNS.
  • Modern technology stack with Amazon, Google, and Cloudflare services.
⚠️

Contested Benchmark Fairness

  • Studies report systemic advantages for large AI companies in rankings.
  • Private testing of multiple model versions by top providers may skew results.
  • Lack of full disclosure on evaluation methodology fuels user skepticism.
✅

No Scam or Blacklist Flags

  • Scam and phishing services detect no risk associated with lmarena.ai.
  • Legal trademark registrations support business legitimacy.
  • Active social profiles and verifiable contact points.

Contradictory Signals

While the site infrastructure and ownership appear reliable, the core functionality—AI model rankings—may be compromised by unfair practices.

Signal A: Platform is technically secure and legitimate

Signal B: Platform's AI rankings show unfair bias and methodological concerns

Category Scores

Red Flags & Warnings

  • The platform favors large AI providers with private test access not available to smaller rivals.
  • Lack of transparency on model variant submissions creates risk of benchmark gaming.
  • Critiques highlight potential conflicts of interest as LMArena explores monetization with ranked labs.

🔎 Detailed Checks & Analysis

Domain and Technical Validity Check

Score: 90/100
Passed

"Stable domain registration since mid-2024 and consistent website metadata enhance technical credibility."

Reason: The domain lmarena.ai demonstrates strong technical signals, including high traffic volume, Cloudflare security, valid SSL certificate, and a modern technology stack.

Ownership and Contact Verification

Score: 85/100
Passed

"Validated contact emails with multiple site sources and active social media presence confirm legitimate operations."

Reason: Ownership details and contact information corroborate the claimed business, with registered trademarks assigned to Arena Intelligence, Inc.

Blacklist and Scam Status Check

Score: 95/100
Passed

"The domain shows no signs of malicious activity or compromise in current technical scans."

Reason: No scam, phishing, or blacklist flags were detected by crypto scam sniffers or Google Safe Browsing services.

Reputation and User Feedback

Score: 40/100
Failed

"These issues impact platform reputation and reliability of its benchmarking results."

Reason: User and researcher complaints highlight bias and unfair practices favoring large AI providers in rankings.

Transparency and Fairness Assessment

Score: 35/100
Failed

"Responses from LMArena acknowledge some concerns but do not fully resolve transparency issues."

Reason: The platform lacks full transparency on model variant submissions and testing protocols, enabling potential benchmark manipulation.

Your Next Steps

  • 1

    Use LMArena rankings as one of several tools rather than sole benchmark for AI evaluations.

  • 2

    Review multiple sources and conduct your own model tests before making decisions based on rankings.

  • 3

    Monitor ongoing discussions about LMArena's methodology and updates to their fairness policies.

  • 4

    Verify contact and domain details via official trademark and domain registration data.

  • 5

    Avoid relying on LMArena for definitive reputational or financial assessments.

Evidence & Citations

🕵🏻 Keep investigating

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