Model API

Kling 4.0 Flash

Kling 4.0 Flash generates videos from text prompts at 720p, with durations from 3 to 20 seconds and configurable aspect ratios.

Model id

Use this in every request

kling/v4/flash/text-to-video

This model has other modes with their own ids: kling/v4/flash/image-to-video, kling/v4/flash/reference-to-video, kling/v4/flash/video-to-video.

Run it

Quote the input, start the generation with the quote, then poll the job. Set RAYWAKE_API_KEY first; see Authentication.

# 1. Price the exact input (quotes are valid for up to 10 minutes)
curl -s https://api.raywake.com/v1/quotes \
  -H "Authorization: Bearer $RAYWAKE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "kling/v4/flash/text-to-video",
  "input": {
    "prompt": "A red ceramic cup on a wooden table, soft morning light"
  }
}'

# 2. Start the generation with the quote_id from step 1
curl -s https://api.raywake.com/v1/generate \
  -H "Authorization: Bearer $RAYWAKE_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: $(uuidgen)" \
  -d '{"model": "kling/v4/flash/text-to-video", "quote_id": "QUOTE_ID", "input": {"prompt":"A red ceramic cup on a wooden table, soft morning light"}}'

# 3. Poll until the status is terminal
curl -s https://api.raywake.com/v1/jobs/JOB_ID \
  -H "Authorization: Bearer $RAYWAKE_API_KEY"

Input

Input fields for kling/v4/flash/text-to-video
Name	Type	Description
`prompt`required	string	Text prompt for video generation.
`duration`	integer	Video duration in seconds (3-20). Default: `5`
`resolution`	string (enum)	Output resolution. Flash is 720p only. Default: `720p` One of: `720p`
`aspect_ratio`	string (enum)	Aspect ratio of the generated video. Default: `16:9` One of: `16:9`, `9:16`, `1:1`, `21:9`

Output

A succeeded job lists its results under outputs, stored on our side. See Jobs for every field.

Job excerpt

"outputs": [
  { "type": "video", "url": "https://…", "mime_type": "video/mp4", "thumbnail_url": "https://…" }
]

Pricing

per second$0.149/ second

The exact charge for your input comes from a quote. How charges settle