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.
These files are kikostefanov-lab/Arena4Ai's own configuration. They tell Claude Code and Codex 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.
CLAUDE.md A 8,686 tok