Your local LLMs, fighting for glory. You decide who wins.
Model Colosseum is a local-first macOS desktop app that turns your Ollama models into gladiators. Pick a topic, pick two models, and watch them argue in real time — streaming token by token, side by side. Elo ratings track performance across debates and benchmarks. No cloud, no API keys, no telemetry.
- Arena Mode — freestyle, formal (3-phase), or Socratic debate formats across 3/5/7 rounds with simultaneous streaming
- Benchmark Mode — 15-prompt battery spanning coding, creative writing, analysis, summarization, and reasoning
- Elo ratings — per-model ratings updated after every voted debate outcome
- Topic suggestions — let one of your models brainstorm debate topics
- Split-pane viewer — PRO on the left, CON on the right, both streaming in real time
- Vote system — Left Wins, Draw, or Right Wins; ratings update immediately
- Rust stable toolchain
- Node.js 20+ and pnpm
- Ollama running locally with at least one model pulled
git clone https://github.com/saagpatel/ModelColosseum
cd ModelColosseum
pnpm install# Start Ollama (if not already running)
ollama serve
# Run the app in development
pnpm tauri dev
# Build release app
pnpm tauri build| Layer | Technology |
|---|---|
| Desktop shell | Tauri 2 |
| Backend | Rust 2021 |
| Frontend | React 19 + TypeScript + Tailwind CSS 4 + Recharts |
| State | Zustand 5 |
| LLM runtime | Ollama (local) via streaming REST API |
| Routing | React Router 7 |
MIT