curl --request POST \
  --url https://api.cartesia.ai/fine-tunes/ \
  --header 'Authorization: Bearer <token>' \
  --header 'Cartesia-Version: <cartesia-version>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "name": "<string>",
  "description": "<string>",
  "language": "<string>",
  "model_id": "sonic-3-2026-01-12",
  "dataset": "<string>"
}
'

{
  "id": "<string>",
  "name": "<string>",
  "description": "<string>",
  "language": "<string>",
  "model_id": "<string>",
  "dataset": "<string>"
}