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Cascade supports arena mode to allow you to easily compare responses from different models on the same prompt.
ModeUse Case
SingleRun Cascade with a single chosen model
ArenaCompare responses from different models

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Arena Mode

To enter arena mode, click the arena button in the model picker and choose your preferred models. When you select multiple models, Cascade will independently execute your prompt with each model in a separate session. Each model also gets its own worktree for isolation.
If you want to view both conversations at the same time, you can drag the Cascade tab into the main editor window to expand the available space.
You can independently continue working in each Cascade conversation, including accepting or rejecting changes or asking follow-up questions. Since each model has its own worktree, you can iterate on each response without affecting the others sessions.

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Choosing the better response

When you’re ready to commit to a particular approach, you should click the “X is better” button to discard other conversations and converge all models to continue with your chosen approach. The next message you send after converging will be sent to all models you have selected, allowing you to continue trying out different approaches.

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Battle Groups

Instead of manually selecting models, you can select one of our curated model groups to have Cascade randomly choose two models to compare. We have two random model groups available:
  • Frontier: Includes frontier reasoning models like GPT 5.2, Claude Opus/Sonnet 4.5, Gemini 3 Pro, etc., optimized for intelligence.
  • Fast: Includes fast reasoning models like SWE 1.5, Claude Haiku, etc., optimized for speed.
When you use one of the battle groups, the exact model names are hidden from you until you click the “X is better” button to converge the models. Then, the original model names are revealed and the conversations are reshuffled.

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When To Use Arena Mode

Arena mode is particularly useful when you want to:
  • Compare code quality across different models
  • Explore different approaches to a hard problem
  • Test out a new model without abandoning your standard preference
  • Access frontier models at reduced cost by using the battle groups

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Limitations

  • Arena mode is only supported for workspaces that have git initialized
  • By default, only Git-tracked files are copied into the worktrees created for each model; you can configure a setup hook to copy additional files as needed

Worktrees

Isolate parallel work in separate git worktrees.

Hooks

Automate actions before and after Cascade operations.