모델 폴백

{
  "model": "openai/gpt-5.4-pro",
  "models": ["openai/gpt-5.4-pro", "openai/gpt-5.4", "anthropic/claude-sonnet-4.6"],
  "messages": [{"role": "user", "content": "Hello"}]
}

{
  "model": "openai/gpt-5.4-pro",
  "models": ["openai/gpt-5.4-pro", "openai/gpt-5.4"],
  "provider": {"order": ["Azure", "OpenAI"], "allow_fallbacks": true}
}

{"models": ["anthropic/claude-opus-4.5", "anthropic/claude-sonnet-4.6", "openai/gpt-5.4-pro"]}

{"models": ["openai/gpt-5.4:free", "meta-llama/llama-4-maverick:free", "openai/gpt-5.4"]}