Scales efficient language processing with open-source accessibility.
Arena AI
Crowdsourced platform for blind, side-by-side AI model comparisons with a public leaderboard.

About Arena AI
Arena AI is a crowdsourced platform where users submit prompts to two anonymous AI models simultaneously and vote on the better response. The platform aggregates these votes into a public Elo-based leaderboard that ranks models across categories such as text, coding, math, creative writing, and image generation. Originally launched in 2023 as Chatbot Arena by UC Berkeley researchers, it has since expanded to include over 360 models and serves millions of monthly active users worldwide. The service is free to use with no account required for basic access, though an enterprise AI Evaluations tier is available for structured commercial testing. Users can compare models without bias by evaluating responses anonymously, helping the community identify strengths and weaknesses across different AI systems. The platform’s leaderboard provides a transparent, data-driven way to track model performance over time. It is designed for researchers, developers, and enthusiasts interested in AI model evaluation and benchmarking.
Key features
- Blind side-by-side model comparisons
- Public Elo-based leaderboard for rankings
- Supports 360+ models across multiple categories
- No account required for basic use
- Crowdsourced voting system
- Enterprise AI Evaluations tier available
- Anonymous model responses to reduce bias
- Global user base across 150 countries
Use cases
- Evaluating AI model performance for research
- Selecting the best model for specific tasks
- Benchmarking AI systems in a transparent way
Pros
- Enables side-by-side comparison of AI models in real time without revealing their identities
- Provides a transparent, community-driven leaderboard based on aggregated user votes
- Covers a wide range of model categories including text, coding, math, creative writing, and image generation
- Free to use for basic access with no account required
- Supports automated evaluation of AI models through user-submitted prompts
Cons
- Responses may be inaccurate as inputs are processed by third-party AI providers
- Users must avoid submitting personal or sensitive information due to public disclosure risks
- Conversations and certain personal information may be shared with AI providers for evaluation purposes
Frequently asked questions about Arena AI
What is Arena AI and how does it work?
Arena AI is a crowdsourced platform where users submit prompts to two anonymous AI models simultaneously and vote on the better response. The platform aggregates these votes into a public Elo-based leaderboard that ranks models across various categories.
Who should use Arena AI?
The platform is designed for researchers, developers, and enthusiasts interested in AI model evaluation and benchmarking. It is particularly useful for those looking to compare AI models transparently and data-driven.
Is Arena AI free to use?
Yes, the service is free to use with no account required for basic access. However, an enterprise AI Evaluations tier is available for structured commercial testing.
What are the privacy implications of using Arena AI?
Users must avoid submitting personal or sensitive information as conversations and certain personal details may be disclosed publicly or shared with AI providers for evaluation purposes.
Can I use Arena AI to evaluate specific AI models?
Yes, Arena AI supports automated evaluation by sending user-submitted prompts to AI providers at a later time to score and compare their models.
How do I get started with Arena AI?
Users can begin by visiting the platform and either submitting prompts for model comparison or exploring the leaderboard to view ranked AI models across different categories.
Arena AI traffic & engagement
arena.ai · third-party estimates from Similarweb
Traffic trend
Last 4 months · grows by one month every month
- Jun 202632M
- Jul 202632M−0.6%
- Aug 202630M−6.8%
- Sep 202630M+1.3%
Where visitors come from
Share of visits by channel
No measurable traffic from Paid Referrals.
Top countries
Share of visits · estimated visits
Other countries: 57.7%
Visits sent by AI assistants
How people reach this site from other AI tools
684K a month · 2.3% of all visits
Compared with similar tools
Coding & Development · Sep 2026
Traffic figures are third-party estimates, good for scale and trends; they can differ from a company's own numbers. Updated monthly.