kling-2.1-master API

Use the exact kling-2.1-master model ID through Modelflare asynchronous video routing.

Use the exact model ID kling-2.1-master. The model field must match this page exactly.

Authentication and endpoint

Use a Modelflare API key with https://modelflare.dev/v1. The gateway entry point is POST /v1/videos.

Authorization: Bearer YOUR_MODELFLARE_API_KEY

Create a task

curl https://modelflare.dev/v1/videos \
  -H "Authorization: Bearer YOUR_MODELFLARE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model_name": "kling-2.1-master",
    "prompt": "A white cat runs through a neon-lit street in the rain, cinematic tracking shot",
    "duration": "5", "mode": "std"
  }'

Poll and download

Save the task ID. Poll GET /v1/videos/{task_id} and download with GET /v1/videos/{task_id}/content. Result URLs may expire, so transfer the file promptly.

curl https://modelflare.dev/v1/videos/TASK_ID \
  -H "Authorization: Bearer YOUR_MODELFLARE_API_KEY"

Request notes

Kling uses family-specific model_name, prompt, mode, duration, image_list, or contents/settings fields; native JSON is preserved and forwarded.

Request parameters

Kling Legacy uses model_name with the text2video/image2video request structures. Check the model’s official page and pricing page for mode, resolution, and audio lanes.

Field	Required	Notes
model_name	Yes	kling-2.1-master
prompt	Conditional	Required for text-to-video; combine with images for image-to-video
image	Conditional	First-frame image URL or Base64
image_tail	No	Optional end-frame image
negative_prompt	No	Negative prompt
mode	No	std / pro / 4k (model-dependent)
duration	No	3–15 seconds (string)
multi_shot	No	Enable multi-shot storyboarding
sound	No	Generate synchronized sound where supported
camera_control	No	Camera control where supported

Input and output limits

Legacy requests use model_name; availability of mode, duration, image/image_tail, sound, and camera_control depends on the model. Minimum billable seconds and resolution lanes follow the per-model rows on the pricing page.

Supported scope

This page covers Modelflare model generation and editing calls. Search or map enrichment, voice management, and element-library management are resource APIs outside this public model-call surface and are not required request fields.

Pricing and billing

This model uses per-second video billing. See the model pricing page for the current customer price, reference list price, and complete specification.

This page documents Modelflare’s public interface; the fields and limits shown here are the current contract.