Free
Added on Oct 22,2026
Arena, formerly known as LMArena and Chatbot Arena, is an AI-powered evaluation platform where people chat with, compare and vote on leading AI models, and those votes feed public leaderboards.
It was created by researchers at UC Berkeley to help people understand how AI models perform in real-world use, and is now run by Arena Intelligence Inc.
Key features include Battle mode, where two anonymous models answer the same prompt and the user votes for the better one. Model names are revealed only after the vote, and only anonymous votes count toward the official rankings.
Side by Side mode lets users pick two specific models to compare, and Direct mode lets them chat with a single chosen model. Users can also build apps and websites, write and edit text, search the web, generate images and videos and run multi-step agent tasks.
Leaderboards cover text, WebDev, image to WebDev, text to image, image editing, text to video, image to video, video editing, vision, documents, search and agents. Rankings are calculated with a Bradley-Terry rating system, similar to Elo, with extra adjustments such as style control.
Arena states that conversations may be shared in de-identified form in public research datasets and with model providers, and advises users not to include sensitive information. The company also offers AI evaluation services for enterprises, model labs and developers.
Pricing: Arena is free to use for chatting, comparing models and viewing leaderboards. Commercial AI evaluations for organisations are arranged by contacting the team.
It is suited to developers, researchers and curious users who want to test and compare AI models on their own prompts and check how models rank across tasks.
By the PowerfulAI.tools Editorial Team · Updated 25 October 2026 · Researched with AI assistance and checked against the official Arena (LMArena) website · How we review tools
Arena (LMArena) is listed as free to use. Check Arena (LMArena)'s website for any usage limits or paid upgrades.
Developers and AI enthusiasts who want to compare frontier models on their own prompts and check public rankings before choosing one.
Rankings come from community votes in head-to-head comparisons, where users chat with models and pick the better answer.
Yes. The site now runs at arena.ai and describes itself as Arena AI, the official AI ranking and LLM leaderboard.
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