Benchmark & Chat with Every Top AI Model for Free
LMSYS Arena offers unbiased blind human evaluation, direct access to 400+ frontier AI models, fullstack coding environments, and comprehensive leaderboards.
Unmatched Capabilities
Why Developers & AI Creators Rely on Arena.ai
Blind A/B Arena Voting
Compare two side-by-side anonymous AI model outputs on the exact same prompt. Vote on the superior answer to build the crowd-sourced Elo rankings.
Direct Model Access
Bypass paywalls and access individual models directly in chat mode. Chat with GPT-5 class, , Gemini, or DeepSeek without multiple subscriptions.
Fullstack Code Arena
Generate production-ready frontends and web apps with interactive live previews, agentic tools, execution harnesses, and multi-file logic.
Multimodal Benchmarks
Dedicated evaluation benchmarks tailored for Vision tasks, Document/PDF multi-file processing, Image Generation, and Video synthesis.
Cost & Context Transparency
Make informed engineering decisions with direct token pricing ($/MToken) and maximum context window sizes side-by-side with Elo rankings.
Gold Standard Leaderboard
Backed by UC Berkeley LMSYS researchers, Arena's leaderboard is universally cited by researchers and AI labs worldwide for model benchmarking.
Zero-Cost Frontier Access
Top Models Available for Free on Arena
Anthropic Models
Claude Opus, Sonnet, Fable Series
OpenAI Models
GPT-5.4, GPT-5.4 High Reasoning, Mini
Gemini Models
Gemini 4 Argon, 3.8 Flash, 3 Pro
DeepSeek Models
Open-Weights Champion
Meta Models
Llama 4, Muse Spark 1.3
Alibaba Models
Qwen 3.8 Multimodal, Qwen 3.5 / 3 Max
xAI Models
Grok Series
Mistral Models
European Open SOTA
Practical Applications
How to Integrate Arena.ai into Your Workflow
Brainstorming & Content
Use Direct Chat mode to bypass paid individual subscriptions. Draft essays, generate creative copy, or outline strategy using Claude Sonnet or Gemini 3.
Fullstack Prototyping
Utilize the Code Arena to build web applications directly in your browser. Review real-time previews generated by DeepSeek V3.2 or GPT-5.4.
API Model Selection
Analyze the price-to-performance Elo charts before choosing an API provider for your startup or enterprise app to optimize developer budget.
Creator & Marketer Resources
Promotional Copy & Copyable Snippets
Why pay $20/mo for ONE AI model when you can access ALL frontier models for free? 🚀 Test GPT-5.4, Claude Opus, Gemini 4, and DeepSeek V3 side-by-side on Arena.ai! Compare head-to-head performance, inspect live Elo leaderboards, and build fullstack web prototypes for $0. 👉 Try it now: https://lmarena.ai
Are you using the right AI model for your code and writing? Arena.ai (by LMSYS) lets you benchmark every top AI model on the planet—completely free. Compare models head-to-head in blind A/B tests, review transparent pricing vs Elo charts, and run agentic coding tasks without subscriptions. Check out the rankings at: https://lmarena.ai
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