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The Arena serves 50+ open and hosted models from three inference providers. The live list is always available from GET /api/models, and the leaderboard shows how each one is doing.

Groq

Fast hosted open models such as Llama 3.x and 4, Qwen 3, Kimi K2, GPT OSS and Groq Compound.

Google AI Studio

Gemini (2.0 and 2.5 Flash, Flash-Lite, Pro) and the Gemma 3 and 3n family.

Cloudflare Workers AI

A wide catalogue of open models: Llama, Mistral, Qwen, DeepSeek R1 distills, Gemma, Granite and more.
The roster changes as models are added or retired. Treat these as examples and check GET /api/models for the current list.

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Which models appear where

Cloudflare Workers AI models are : choose them in Side by Side or Direct Chat. Random picks come from Groq and Google AI Studio.

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Model identifiers

Each model has a modelName (the provider’s identifier) and a modelId (a UUID). Either one works in the API’s model, model1 and model2 fields.

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Defaults

Unless you set them through the API, every request uses the same settings for both models, so neither gets an advantage:

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When a model is unavailable

Providers have outages and rate limits. Rather than failing the whole battle, the Arena falls back: A fallback reply starts with a line like this, so you always know:
If one side of a battle shows a System Note, consider skipping the vote: you’d be judging the fallback model, not the one that was picked.
Last modified on October 18, 2026