Best Arena AI alternatives I found.
Comparity was founded by the Max Planck Institute of Intelligent Systems and Tubingen AI Center.
It only offers an anonymous side-by-side format. However, the top models it offers are Opus 4.7, Opus 4.6, Sonnet 4.6, GPT-5.6 Terra, Opus 4.8, Grok 4.3, Fable 5, Mistral Large 3, Sonnet 5, and GPT-5.6 Sol.
The name is strikingly similar to Arena. It's another comparison platform with an anonymous developer. I wouldn't recommend it, because it only offers Gemini 2.5 Flash-Lite, Gemini 3.5 Flash, Gemini 3.1 Flash-Lite, DeepSeek V4 Flash, DeepSeek V3.2, GLM 4.7 Flash. The models are good for casual users, but aren't anything exotic.
It's not a very great service. It offers Gemma, Cohere, Nova, ChatGPT, AI21, Qwen, DeepSeek, Mistral, MiniMax for free. And it is no signup + frictionless. I don't like it because the model versions are hidden and likely outdated.
Offers free OpenRouter models. Not very great because it doesn't offer advanced ones.
What other ones you guys have found?
Posted Aug 12, 2026, 8:23 PM UTC