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Models/Kuaishou/Kling 4.0
Kuaishouvideo2 routes

Kling 4.0

Kuaishou's newest Kling: up to 30 seconds at 720p or 1080p, always with stereo sound, from text, a first and last frame, or up to 10 reference images.

kling-4.0Get API key

Pricing per second of video

ResolutionPer second
720p$0.1818 credits
720p + with video input$0.11lowest11 credits
1080p$0.2727 credits
1080p + with video input$0.1616 credits

Billed in credits per second of video (100 credits = $1, rounded up to a whole credit). Charged once, only for the route that succeeds. Failed attempts cost $0.00.

Request

# 1. Submit a generation and keep its id (a refusal prints {"error": {"message": ...}})
RESP=$(curl -s https://api.revana.si/v1/generations \
  -H "Authorization: Bearer $REVANA_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "kling-4.0",
    "input": {
      "prompt": "A slow dolly shot through a neon-lit night market in the rain, steam rising from food stalls",
      "resolution": "720p",
      "duration": 3,
      "aspect_ratio": "16:9",
      "audio": true
    }
  }')
echo "$RESP"
ID=$(echo "$RESP" | jq -r .id)

# 2. Poll it until status is "succeeded" or "failed" (a failed one has error.message)
curl -s https://api.revana.si/v1/generations/$ID \
  -H "Authorization: Bearer $REVANA_API_KEY"

# 3. Download the file once it has succeeded
curl -L https://api.revana.si/v1/generations/$ID/content \
  -H "Authorization: Bearer $REVANA_API_KEY" \
  -o out.mp4

Set REVANA_API_KEY to your key. Full reference in the quickstart.

Options

Tasks
Text to videoImage to videoFirst + last frameReference to videoVideo to video
Resolutions
720p1080p
Durations
3 s4 s5 s6 s7 s8 s9 s10 s11 s12 s13 s14 s15 s16 s17 s18 s19 s20 s21 s22 s23 s24 s25 s26 s27 s28 s29 s30 s
Aspect ratios
16:99:161:121:9
Audio
Supported
Input images
Up to 10
Billing unit
per second of video
Model id
kling-4.0

2 routes

Every request starts on the cheapest route. If it fails, the job moves to the next one automatically.

About the Kling 4.0 API

How much does the Kling 4.0 API cost?

Kling 4.0 costs from $0.11 per second of video on Revana (720p: $0.18; 720p + with video input: $0.11; 1080p: $0.27; 1080p + with video input: $0.16). You pay in prepaid credits, 100 credits to the dollar, with no subscription or monthly minimum. A generation that fails costs nothing.

How do I call Kling 4.0 from code?

Send POST https://api.revana.si/v1/generations with {"model": "kling-4.0", "input": {...}} and your Revana API key as a Bearer token, poll GET /v1/generations/{id} until it succeeds, then download GET /v1/generations/{id}/content. Every model on Revana takes the same request shape.

What happens if a Kling 4.0 generation fails?

Revana has 2 routes for Kling 4.0. A job starts on the cheapest and moves to the next automatically if one fails. You are charged once, only for the route that delivers. A failed generation costs $0.00.

What can Kling 4.0 do on Revana?

Kling 4.0 supports text to video, image to video, first + last frame, reference to video and video to video, resolutions 720p, 1080p, durations 3 to 30 seconds, aspect ratios 16:9, 9:16, 1:1, 21:9, generated audio and up to 10 input images. A value it does not offer is refused with 422 before anything is charged.

Can my AI agent use Kling 4.0?

Yes. Connect the Revana MCP server (https://revana.si/api/mcp) to Claude, ChatGPT, Cursor or Codex, or have the agent call the REST API. The agent can list models, get a free quote and generate on your credits.

Compare with similar models

Also as markdown for agents. Every model and price: models.json.