LM Arena
Web platform for comparing, running, and deploying large language models with hosted inference and API access.
At a Glance
Pricing
Free platform for comparing AI models and contributing to crowdsourced leaderboards.
Engagement
Available On
About LM Arena
LM Arena provides a web-based environment for running, comparing, and deploying large language models. It focuses on making model evaluation, hosted inference, and simple deployment workflows accessible from a browser and via an API. The platform supports uploading or connecting models, running evaluation workloads, and exposing inference endpoints for applications.
- Model comparison run side-by-side evaluations and benchmarks across models.
- Hosted inference deploy models to managed endpoints for production usage.
- API access programmatically invoke models and integrate into applications.
- Custom model uploads bring your own model artifacts for testing and deployment.
- Usage monitoring track usage metrics and performance of deployed endpoints.
To get started, sign up on the web app, upload or connect a model, run a comparison job, and create an inference endpoint; use the provided API keys to integrate inference into your applications.

Community Discussions
Video Arena is out on LM Arena and it's pretty wild
So LM Arena shipped their Video Arena feature and I've been messing around with it. You can now compare AI video models side by side, things like Sora, Hailuo, Veo 3.1, and a bunch of others. The cool part is it runs through their Discord server and you get to vote on which model output you like bet…
Pricing
Open Source
Free platform for comparing AI models and contributing to crowdsourced leaderboards.
- Compare answers across all AI models
- Side-by-side model battles
- Vote and contribute to public leaderboard
- Save chat history with account
- Access to all leaderboard categories (Text, Vision, WebDev, Image, Video, etc.)
Capabilities
Key Features
- Model comparison
- Hosted inference endpoints
- API access
- Custom model uploads
- Usage monitoring and metrics
Integrations
Demo Video
