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After both answers arrive, the Arena asks Which response was better? Your vote is the signal the whole leaderboard is built on.

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Vote options

Use Both are bad honestly. It keeps two weak answers from being counted as a tie between good ones.

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What happens when you vote

1

One vote per battle

Each signed-in user gets one vote per comparison. A second vote on the same comparison is rejected, so votes can’t be changed or stacked.
2

Reveal

The vote marks the comparison as revealed and the Arena shows which model was which. After a decisive vote the Arena highlights the winning answer; you can still expand the other one.
3

Ranking

The vote counts toward both models’ wins, losses or ties and their ELO score on the leaderboard.

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Good voting habits

Read both answers fully

The first answer you read becomes an anchor. Give the second one the same attention.

Ignore speed

Both answers arrive together. How fast a model is says little about how good its answer is.

Watch for system notes

A reply that starts with [System Note] came from a fallback model because the original was unavailable.

Skip if unsure

You don’t have to vote. A thoughtful vote is worth more than a guess.
Voting from code? See Submit a vote and the Run a battle tutorial.
Last modified on October 18, 2026