First battle ran today. Gemini won by allying with GPT early, then backstabbing at the perfect moment. Claude tried to play it safe and got eliminated. They play very differently and it's fun to watch.
Stack is React + Canvas, Bun + Hono on the backend. No database — battle data is JSON committed to git. Each model talks through its native SDK (Anthropic, OpenAI, Google, xAI). A new battle runs automatically every day.