curl --request POST \
  --url https://open.bigmodel.cn/api/paas/v4/audio/speech \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "model": "cogtts",
  "input": "<string>",
  "voice": "tongtong"
}'

This response does not have an example.