Two AI coding agents race on the same brief in isolated workspaces; an AI cross-judge reads the files they actually produced and scores them against your rubric, live. Self-hosted — drives the claude, codex and gemini CLIs you already have. No API keys.
1 file for Claude Code: Arena4Ai CLAUDE.md — 6,660 tokens loaded in every session.
CLAUDE.md A 6,660 tok These files are kikostefanov-lab/Arena4Ai's own configuration — they tell Claude Code how to work on this repository, so they are not mods to install elsewhere. Copy one as a starting point and replace the parts that are about this project.