LMArena
LMArena is a UC Berkeley-born AI evaluation platform using anonymous model battles and crowd votes to shape a live public leaderboard, with free access to chat with top models.
Verification level not recorded · · Submit a correction
Best for: users and researchers wanting free flagship access and preference-based rankings; not for: deep vertical-domain professional evaluation.
Decision facts
“Not verified” means evidence is insufficient, not that the capability is absent.
What is LMArena
LMArena is a UC Berkeley-born AI evaluation platform using anonymous model battles and crowd votes to shape a live public leaderboard, with free access to chat with top models.
Key features of LMArena
- Blind-voting on two anonymous model answers to a prompt
- Checking the live public leaderboard for preference rankings
- Chatting with top-tier AI models for free
- Seeing model identities revealed after voting
Good for
- Blind crowd voting resists gaming and reflects real experience
- Transparent, real-time public leaderboard
- Free chat across proprietary and open-source models
Watch out
- Reflects popular preference, not expert capability
- Niche vertical performance can be averaged out
- Weaker than systematic benchmarks for per-model depth
How to use LMArena
- Visit lmarena.ai
- Type any question or prompt
- Compare the two anonymous model answers
- Vote for the better response
- See the model reveal and leaderboard positions
Who LMArena is for
Difficulty: Beginner
- Blind-voting on two anonymous model answers to a prompt
- Checking the live public leaderboard for preference rankings
- Chatting with top-tier AI models for free
- Seeing model identities revealed after voting
FAQ
How does LMArena evaluate models?
Two anonymous models answer each user prompt side by side, users blind-vote for the better one, and aggregated votes form the public leaderboard.
Is chatting on LMArena free?
Yes. Talking with top models is free, and your usage contributes data to the leaderboard.
Can I see which models answered before voting?
No. Voting is blind; model identities are revealed only after you vote.
Sources and verification
Evidence status: Verification level not recorded
Sources: lmarena.ai (opens in a new tab)
Content reviewed: · Submit a correction →
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