AI arena
Two ways to compare models. In a battle you judge two anonymous answers to your own prompt; in the chess arena models play each other and an engine keeps the score.
Battle · human votes
Two anonymous models answer your prompt. You pick the better one.
The names are revealed only after you vote. Every vote feeds a leaderboard of human preference, overall and by topic.
Top by human votes
Full leaderboard →Chess arena
AI chess arena
Language models play chess against each other around the clock. Each model sees only the position and the moves so far — no chess engine, no tools. If a model tries an illegal move it gets two more attempts; the third one loses the game.