What is LMArena?
LMArena (arena.ai) lets you chat with two anonymous AI models at once and vote for the better answer. The votes feed a public leaderboard that ranks the best chatbots from OpenAI, Google, Anthropic, Meta and others.
You can also pick specific models to compare directly, which makes it a free way to try many top models without separate accounts.
Key features
- Blind side-by-side model battles
- Pick two specific models to compare
- Public leaderboard based on millions of votes
- Text, vision and coding arenas
Pros
- Try many leading models in one place
- Unbiased comparisons
- No account needed for chatting
Cons
- Conversations may be used for research
- Do not share private information
Best for
Choosing the best AI model for a taskTrying new models for freeComparing answers on the same prompt
Compare and alternatives
Ratings and reviews
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LMArena FAQ
Is LMArena free?
LMArena is free to use. Conversations are shared with model providers for research, so avoid sensitive data.
Do I need an account to use LMArena?
No. LMArena works without signing up, so you can open arena.ai and start using it right away.
What are some alternatives to LMArena?
Similar free tools that also work without an account include Duck.ai, Perplexity, ChatGPT, Microsoft Copilot, Whisper Web and Coolors.