OpenRouter Models and Providers

{
  "model": "gpt-5.4-mini",
  "messages": [
    { "role": "user", "content": "Summarize this release note." }
  ],
  "provider": {
    "only": ["openai"],
    "allow_fallbacks": false
  }
}

{
  "model": "claude-sonnet-5",
  "messages": [
    { "role": "user", "content": "Draft a migration checklist." }
  ],
  "provider": {
    "order": ["anthropic", "amazon-bedrock/global"],
    "allow_fallbacks": true
  }
}