Kling 2.1 Master API

Unifically: one endpoint, one API key, USD billing.

What is Kling 2.1 Master?

Kling 2.1 Master is the Pro-only variant of Kling 2.1. It always renders at 1080p and supports both text-to-video and image-to-video from one model ID. Pass a prompt on its own for a fresh generation, or pass a prompt plus a start frame to animate a supplied still. Duration is 5 or 10 seconds and a sound effects track is available in the same call. There is no Standard toggle and no end-frame parameter, which is the entire point of Master: one input shape, one output resolution, predictable downstream QC.

Key features of Kling 2.1 Master

Four features cover the case for Master over the rest of the 2.1 line.

Pro-only 1080p output

Every render is 1080p. There is no Standard mode to forget about, which keeps QC pipelines simple and removes the resolution drift you get from a per-job toggle.

Text-to-video and image-to-video in one model

Send a prompt on its own for a fresh generation, or pass a start frame alongside the prompt to animate a supplied still. The same model ID handles both paths.

5 or 10 second clips

Pick the length that fits the placement. 5 seconds for feed loops and short ads, 10 seconds for product reveals and longer narrative beats.

Sound effects in the same call

The sound_effects object adds ambient sound, background music, or ASMR-style audio to the result. Omit the field for a silent clip.

Best for

Hero spots that need 1080p

Always-Pro output for ads and brand placements without a per-job toggle. Useful when the team should never deliver 720p by accident.

Premium social posts

1080p in vertical or square. The right resolution for paid social and feed-grid presence.

Pitch and review delivery

High-resolution exports without exposing lower-quality variants to stakeholders during review.

Brand-safe single-profile pipelines

One Pro path simplifies QC. Useful for agencies and in-house teams with strict review.

Product teasers from a single still

Optional start image plus prompt for controlled motion in 1080p.

Single-quality production at scale

When the entire team should output the same resolution, Master enforces it at the model layer.

Use cases

Run a campaign at a single resolution by routing every brief through Master, so the QC step only ever evaluates 1080p output. Generate a 10-second product teaser from key art by passing the still as the start frame and a short motion prompt. Layer in a music bed through sound_effects to skip the separate audio pass. Build a paid social cut at 9:16 by uploading a vertical hero still and running Master against it; the output inherits the input aspect, so the asset is feed-ready without a reframe.

API examples

Call Kling 2.1 Master from any language by POSTing to /v1/tasks. Full parameter docs live at docs.unifically.com/models/video/kling/kling-2.1.

curl -X POST https://api.unifically.com/v1/tasks \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "model": "kuaishou/kling-2.1-master-video",
    "input": {
      "prompt": "Cinematic scene with dramatic lighting",
      "duration": 10,
      "sound_effects": {
        "music": "cinematic orchestral"
      }
    }
  }'

Successful submission returns a task_id. Poll GET /v1/tasks/<task_id> or set a callback_url on the request to receive the finished result.

FAQs