Model Registry
The registry. Secrets are never stored — only the name of the env var holding each key. Live providers are inert until their key is set AND ARENA_ENABLE_LIVE_PROVIDERS=1.
| Model | Provider | Version | Context | In $/Mtok | Out $/Mtok | Capabilities | Readiness |
|---|---|---|---|---|---|---|---|
| Sim Strong | mock | 1.0.0 | 200k | $3.00 | $15.00 | toolsjsonreasoning | ready |
| Sim Balanced | mock | 1.0.0 | 128k | $0.5000 | $1.50 | toolsjsonreasoning | ready |
| Sim Fast/Cheap | mock | 1.0.0 | 32k | $0.0500 | $0.2000 | toolsjson | ready |
| Yuu v1.1 (simulated) | mock | 1.1.0 | 128k | $0.2000 | $0.6000 | toolsjsonreasoning | ready |
| Yuu v1.2 (simulated) | mock | 1.2.0 | 128k | $0.2000 | $0.6000 | toolsjsonreasoning | ready |
| Yuu no Sekai v1.1 | openai-compatible | 1.1.0 | 33k | — | — | reasoning | inert |
| Claude Opus 5 | anthropic | 5.0.0 | 200k | $5.00 | $25.00 | toolsjsonreasoning | inert |
| Gemini 2.5 Flash | gemini | 2.5.0 | 1000k | $0.3000 | $2.50 | toolsjsonreasoning | inert |
“Inert” means the model cannot make a call in this environment — usually because live providers are disabled or its key env var is unset. This is the safe default: clicking run cannot spend money.