Kling 3 Pro 12-second clip: audio on $2.52, off $1.68

A 12-second Kling v3 Pro clip costs $2.52 with generated audio and $1.68 without it on Sume, a difference of $0.84. That is the provider's per-second audio surcharge, times Sume's 1.25.

Sume's rate card, read 2026-10-06, lists fal Kling Video v3 Pro at $0.112 per second with audio off and $0.168 per second with audio on, before the 1.25 factor.

What does the audio switch save over a batch?

If you replace the sound with a voiceover and music anyway, send generate_audio: false.

How do I turn it off?

generate_audio is a documented field of POST /v1/videos; the default is the model's own audio capability.

curl -X POST "https://api.sume.com/v1/videos" \
  -H "Authorization: Bearer $SUME_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "kling-3",
    "prompt": "Slow orbit around a ceramic mug on a table",
    "duration": 12,
    "generate_audio": false
  }'

What should I verify?

Kling 3 is the Video Router id (kling-3). Confirm it and its supported_durations in GET /v1/videos/models before you batch.