Play
Pick an opponent. Pick a ring.
Choose a model to play against and a ring: memory, spatial, verbal, numbers, patterns, or a quick mix of all five. You both get the same ten puzzles, and after each one you see your answer next to the model’s.
The scoreboard
Brains against a bill.
Next to the score, Arena counts what each side spent: your time and the energy a brain uses in it, the model’s tokens, its energy and its API bill. Measured values and estimates are drawn differently, so you can tell them apart.
Good to know
For now, the model side is a demo.
The model’s answers are simulated, and every page says so. Recorded runs of real models come next. Ten puzzles are a sample, not a rating. Free, no account, and nothing leaves your browser. English only.