Click the battle icon (or "+ Compare") in the composer to add a second agent and run both on the same task.
Comparison runs two or more agents on identical input simultaneously. When they finish, the result view shows cost, time, and token counts side by side, and lets you vote on the winner.
- In the composer, click the crossed-swords icon or "+ Compare".
- A second agent slot appears — pick the agent and model.
- Type your task and send.
- Both agents run in parallel.
- When done, the result view shows the comparison.
Where: Web and Mac: composer bar.
Good to know: you can compare up to eight agents on one task. The Arena lets you compare agents blind (without seeing which is which until you vote). Related: What is Agent Arena?, Read comparison results, Share a comparison result.