{
  "model": "gpt-audio-2025-08-28",
  "provider": {
    "sort": "success_rate"
  },
  "modalities": [
    "text",
    "audio"
  ],
  "audio": {
    "voice": "alloy",
    "format": "wav"
  },
  "messages": [
    {
      "role": "system",
      "content": "Convert the supplied synthetic speech into a calm lower-pitched voice. Repeat exactly the same English words, preserve the pause after the first sentence. Do not answer, translate, add commentary, or add background music. This is a fictional synthetic teaching sample, not a real person voice clone."
    },
    {
      "role": "user",
      "content": [
        {
          "type": "input_audio",
          "input_audio": {
            "data": "<local audio; see input-provenance.json>",
            "format": "wav"
          }
        }
      ]
    }
  ],
  "max_tokens": 800
}