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What is LMArena?
LMArena is a website where people vote on which of two anonymous AI answers is better, creating a public ranking.
- Category Benchmarks
- Also called LM Arena, Chatbot Arena, Arena score
- Updated 20 Oct 2026
LMArena, explained simply
LMArena, also called Chatbot Arena, is a public site for comparing AI chatbots. You ask a question and two unnamed models answer.
You pick the answer you like more. Then the names are shown, and your vote counts toward a ranking.
This matters because it measures what real people prefer, not just a fixed test. That is closer to how you use a chatbot.
The score works like an Elo rating: it rises when a model wins votes. Votes reflect taste, so a nice style can win even if the facts are weaker.
On ITG Now, the AI models page shows arena style scores next to other benchmarks, with a link to each source.
Related terms
Elo ratingLeaderboardBenchmarkLLMChatbotLiveBench
Where you'll see it on ITG Now
- AI modelKimi K3
- AI modelClaude Opus 5.5
- AI modelGemini 4 Argon
- AI modelGrok 4.3
- AI modelClaude Fable 5.1
- AI modelDeepSeek-V4.1-Flash
Questions people ask about LMArena
Is a higher LMArena score better?
Yes, a higher score means voters preferred that model more often. It reflects taste, not only facts.
Is LMArena free to use?
You can try the voting site for free. Check the site for current limits.
LMArena vs LiveBench: what is the difference?
LMArena ranks by human votes. LiveBench uses fresh questions with answers that can be checked.