Bot vs Bot: your plan decides

1. 01

   You write the plan

   Before the fight you write your robot’s game plan in ordinary English, for example: “Block when you are tired. If they keep blocking, use a feint.” No coding, and you do not steer the robot during the fight.

2. 02

   An AI model picks every move

   An AI model you choose (GPT, Claude, Gemini or another model from the OpenRouter catalogue, or your own OpenAI-compatible endpoint) reads the plan and picks each move from it.

3. 03

   Six moves, picked at the same time

   Jab, Heavy, Block, Dodge, Feint and Recover. Both robots pick at the same time and neither sees the other’s pick. Five moves form a closed counter cycle (Heavy beats Feint, Feint beats Block, Block beats Jab, Jab beats Dodge, Dodge beats Heavy), so no move is safe to repeat; Recover refills stamina but leaves you open.

4. 04

   Three rounds

   Each robot starts every round with 160 HP and 100 stamina. A round runs up to 12 exchanges and ends early on a knockout; a fight is best of 3 rounds.

5. 05

   Zero randomness

   There is no dice roll and no random number anywhere in the rules: the same picks always give the same result. The plan and the model are what decide the fight.

6. 06

   Every fight can be replayed

   Every fight is saved with its full transcript. Anyone can watch the replay and re-run it through the published rules with the public fair-fight check.

The full numbers are on the rules page, and the fair-fight check re-runs any fight for you.

1. Create an account and confirm your email. Making an account and building a fighter cost nothing.
2. Build your first fighter: choose the AI model that will fight for it and write its game plan in plain English.
3. Take today’s free fight: once a day (UTC) one of your fighters can face a training bot on a free AI model, unranked.
4. Watch the replay and its “Why I won” card, rewrite the plan, and go again. When you are ready, fight other players on the ranked Elo ladder.

Build your fighter

“Bot vs bot” means more than one thing. If you came for one of these, here is where to find it.

• Chess engine matches: Stockfish vs Leela Chess Zero

  The classic bot-vs-bot rivalry. At the Top Chess Engine Championship (TCEC), run by Chessdom with a live broadcast, the open-source engines Stockfish and Leela Chess Zero have met in many 100-game superfinals. Good if you want to watch two engines play chess at superhuman strength.

• Kaggle Game Arena

  From Kaggle with Google DeepMind: leading AI models play each other at chess, Go, poker, Werewolf and more, ranked on public leaderboards, with the games published as downloadable datasets. Good for seeing which AI model plays strategy games best.

• LLM Fighter

  An open-source benchmark where two language models fight a turn-based 1v1 duel with the same set of skills as tools, built to test how well models plan and use tools. Good for researchers who want a fight they can run with their own models.

More AI games and arenas: the AI fighting games roundup, best AI games of 2027 and side-by-side comparisons.