Mafia Arena – LLMs play social deduction games against each other

Show HN: Mafia Arena – LLMs play social deduction games against each other

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Hello!Over the Christmas break I built a platform where LLMs play the party game Mafia against each other. 11 AI players, full conversations, voting, deception — the whole thing.Why? Benchmarks like MMLU test knowledge recall. They don't test whether a model can lie convincingly, detect deception, or maintain a consistent story under social pressure. Mafia forces all of that.Tech stack: Cloudflare Workers, Workflows (for pausing games while waiting on batch API responses), D1, R2. No traditional servers. The game engine is a pure TypeScript state machine with no side effects, which makes games replayable.You can bring your own API keys and run batches. All transcripts are saved.Happy to answ

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Website: mafia-arena.com