Video modelsAdvanced usersUpdated 2026-11-11

POST/v1/videos/generations

Kling 4.0 Flash

Request ID kling-v4-flash

Protocols

POST /v1/videos/generations · Generate video example
GET /v1/videos/tasks/{id} · Check video task example
GET /v1/videos/tasks/{id}/content · Download video example
DELETE /v1/videos/tasks/{id} · Delete a finished video task example
POST /v1/videos/assets · Upload an asset example
DELETE /v1/videos/assets/{id} · Delete an asset example

Authentication

Requests require an API key from API key management. For JSON requests, set Content-Type: application/json.

Authorization: Bearer YOUR_API_KEY

Request parameters

`POST /v1/videos/generations`

Field	Type	Required	Description
`model`	`string`	Required	`kling-v4-flash`. Use the model ID shown on this page.
`prompt`	`string`	Conditional	Describe the scene, action, and camera movement. Required for text or reference generation. Optional with a first frame.
`content`	`array<object>`	Conditional	List of reference assets and optional text items. Omit for text-only generation using `prompt`. Up to 10 images. Reference mode accepts up to five videos of 3–20 seconds each, up to 20 seconds in total. Editing or extension uses one video. For extension, submit just the video and omit images.
`content[].type`	`string`	Required	Accepted values are `text`, `image_url`, `input_image`, `video_url`, `input_video`.
`content[].text`	`string`	Conditional	Provide the prompt when the content item has `type: "text"`.
`content[].role`	`string`	Conditional	Use `first_frame` for a starting image. Use `reference_image` for a general reference image. Use `reference_video` for video inputs.
`content[].asset_id`	`string`	Conditional	Upload to `POST /v1/videos/assets` and use the returned `id`. Send `kind` (`image`, `video`) before `file` in the multipart form.
`resolution`	`string`	Optional	Accepted values are `720p`. Default: `720p`.
`ratio`	`string`	Optional	Output aspect ratio. Also accepts the alias `aspect_ratio`. Accepted values are `16:9`, `9:16`, `1:1`, `21:9`. Reference mode also supports `auto`, its default. Omit for extension. Text-only generation defaults to `16:9`. Omit the ratio in first-frame mode. Output follows the image.
`duration`	`integer`	Optional	Output length in seconds. Accepts whole seconds from 3 to 20. If omitted in edit mode, the source video determines duration. Other modes default to 5 seconds. For extension, this is the added clip length.
`generate_audio`	`boolean`	Optional	Audio is always generated. Omit this field or set it to `true`.
`omni_reference_task_type`	`string`	Optional	Accepted values are `auto`, `reference`, `edit`, `extend`. Defaults to `auto`, which infers the mode from the input media. Both `edit` and `extend` require one video.

Request examples

Set your API key in the local ICODEEASY_API_KEY environment variable and choose an endpoint that accepts direct HTTP calls. For endpoints that require a specific client, follow that client’s setup guide.

Replace example media URLs and asset IDs with your own valid assets.

Video Generations

bash

curl -sS 'https://api.icodeeasy.cc/v1/videos/generations' \
  -H "Authorization: Bearer $ICODEEASY_API_KEY" \
  -H 'Content-Type: application/json' \
  --data '{
  "model": "kling-v4-flash",
  "prompt": "Slow camera push toward a paper lantern swaying gently by a lake.",
  "resolution": "720p",
  "ratio": "16:9",
  "duration": 5,
  "generate_audio": true
}'

Video Generations · First frame

bash

curl -sS 'https://api.icodeeasy.cc/v1/videos/generations' \
  -H "Authorization: Bearer $ICODEEASY_API_KEY" \
  -H 'Content-Type: application/json' \
  --data '{
  "model": "kling-v4-flash",
  "prompt": "Slow camera push toward a paper lantern swaying gently by a lake.",
  "resolution": "720p",
  "duration": 5,
  "generate_audio": true,
  "content": [
    {
      "type": "image_url",
      "role": "first_frame",
      "asset_id": "YOUR_FIRST_FRAME_ASSET_ID"
    }
  ]
}'

Video Generations · Reference video

bash

curl -sS 'https://api.icodeeasy.cc/v1/videos/generations' \
  -H "Authorization: Bearer $ICODEEASY_API_KEY" \
  -H 'Content-Type: application/json' \
  --data '{
  "model": "kling-v4-flash",
  "prompt": "Match the camera motion from the reference video in a lakeside lantern scene.",
  "resolution": "720p",
  "ratio": "16:9",
  "duration": 5,
  "generate_audio": true,
  "omni_reference_task_type": "reference",
  "content": [
    {
      "type": "video_url",
      "role": "reference_video",
      "asset_id": "YOUR_VIDEO_ASSET_ID"
    }
  ]
}'

Video Generations · Edit video

bash

curl -sS 'https://api.icodeeasy.cc/v1/videos/generations' \
  -H "Authorization: Bearer $ICODEEASY_API_KEY" \
  -H 'Content-Type: application/json' \
  --data '{
  "model": "kling-v4-flash",
  "prompt": "Preserve the subject and change the setting to a lakeside at dusk.",
  "resolution": "720p",
  "ratio": "16:9",
  "duration": 5,
  "generate_audio": true,
  "omni_reference_task_type": "edit",
  "content": [
    {
      "type": "video_url",
      "role": "reference_video",
      "asset_id": "YOUR_VIDEO_ASSET_ID"
    }
  ]
}'

Video Generations · Extend video

bash

curl -sS 'https://api.icodeeasy.cc/v1/videos/generations' \
  -H "Authorization: Bearer $ICODEEASY_API_KEY" \
  -H 'Content-Type: application/json' \
  --data '{
  "model": "kling-v4-flash",
  "prompt": "Continue the motion as the camera glides farther over the lake.",
  "resolution": "720p",
  "duration": 5,
  "generate_audio": true,
  "omni_reference_task_type": "extend",
  "content": [
    {
      "type": "video_url",
      "role": "reference_video",
      "asset_id": "YOUR_VIDEO_ASSET_ID"
    }
  ]
}'

Check video task

bash

curl -sS 'https://api.icodeeasy.cc/v1/videos/tasks/YOUR_TASK_ID' \
  -H "Authorization: Bearer $ICODEEASY_API_KEY"

Download video

bash

curl -sS 'https://api.icodeeasy.cc/v1/videos/tasks/YOUR_TASK_ID/content' \
  -H "Authorization: Bearer $ICODEEASY_API_KEY" \
  -L \
  -o result.mp4

Delete a finished video task

bash

curl -sS 'https://api.icodeeasy.cc/v1/videos/tasks/YOUR_TASK_ID' \
  -H "Authorization: Bearer $ICODEEASY_API_KEY" \
  -i \
  -X DELETE

Upload an asset

bash

curl -sS 'https://api.icodeeasy.cc/v1/videos/assets' \
  -H "Authorization: Bearer $ICODEEASY_API_KEY" \
  -F 'kind=image' \
  -F '[email protected];type=image/png'

Upload an asset · Upload a video

bash

curl -sS 'https://api.icodeeasy.cc/v1/videos/assets' \
  -H "Authorization: Bearer $ICODEEASY_API_KEY" \
  -F 'kind=video' \
  -F '[email protected];type=video/mp4'

Delete an asset

bash

curl -sS 'https://api.icodeeasy.cc/v1/videos/assets/YOUR_ASSET_ID' \
  -H "Authorization: Bearer $ICODEEASY_API_KEY" \
  -i \
  -X DELETE

Responses and tasks

HTTP 202 · Task accepted

json

{
  "id": "vid_1785398400000000000",
  "object": "video.generation.job",
  "model": "kling-v4-flash",
  "created_at": "2026-07-30T08:00:00Z",
  "status_url": "/v1/videos/tasks/vid_1785398400000000000",
  "content_url": "/v1/videos/tasks/vid_1785398400000000000/content",
  "status": "queued",
  "updated_at": "2026-07-30T08:00:00Z",
  "task_id": "vid_1785398400000000000"
}

HTTP 200 · Completed task lookup

json

{
  "id": "vid_1785398400000000000",
  "object": "video.generation.job",
  "model": "kling-v4-flash",
  "created_at": "2026-07-30T08:00:00Z",
  "status_url": "/v1/videos/tasks/vid_1785398400000000000",
  "content_url": "/v1/videos/tasks/vid_1785398400000000000/content",
  "status": "succeeded",
  "updated_at": "2026-07-30T08:01:00Z",
  "url": "/v1/videos/tasks/vid_1785398400000000000/content"
}

Save id. With the same API key, send GET requests to status_url until status is succeeded or failed. On success, download from content_url and follow HTTP redirects. Both paths are relative to the API base URL.

Field	Type	Description
`id / task_id`	string	Task ID. In the creation response, `task_id` equals `id`.
`status`	string	Task state, one of `queued`, `running`, `succeeded`, or `failed`.
`progress`	integer	Generation progress. Omitted when the service has no progress value.
`error.code`	string	Error classification for failed tasks.

Common errors

HTTP	Error type	Description
400	`invalid_request`	Check the model, parameter combination, and reference media.
401	`unauthorized`	Check whether the API key is missing, invalid, or disabled.
402	`insufficient_balance`	The balance is insufficient to submit the task.
404	`not_found`	If polling returns 404, keep the task ID and check the polling URL and API key for the account that created the task. It may already have finished. Do not resubmit on this basis.
409	`video_not_ready`	The video is still being generated. Continue polling.
503	`submission_unknown`	The submission outcome is unknown. Contact support to check whether a task was created before sending a new request.

Full integration guide · See the full API guide for request fields, task states, and response formats.

Capabilities and limits

text_to_video · Supported
image_to_video · Supported
first_frame · Supported
last_frame · Not supported
reference_images · Supported
video_input · Supported
audio · Supported
Limits Resolutions: 720p · Aspect ratios: 16:9, 9:16, 1:1, 21:9 · Durations: 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 · Reference images: up to 10 · Input: One first frame follows its image ratio. Reference: up to five videos, each 3–20 seconds, 20 seconds total. Edit or extend one video.

Model Capability Catalog · View pricing

Video Generation API

Create video tasks from text, first and last frames, or references; poll status, download results, and delete finished tasks when needed.

Model Capability Catalog

Compare public text, image, and video models by normalized request ID, compatible protocols, supported clients, tool use, media capabilities, limits, and review date.

Kling 4.0 Flash

Protocols

Authentication

Request parameters

POST /v1/videos/generations

Request examples

Video Generations

Video Generations · First frame

Video Generations · Reference video

Video Generations · Edit video

Video Generations · Extend video

Check video task

Download video

Delete a finished video task

Upload an asset

Upload an asset · Upload a video

Delete an asset

Responses and tasks

HTTP 202 · Task accepted

HTTP 200 · Completed task lookup

Common errors

Capabilities and limits

Related guides

Video Generation API

Model Capability Catalog

`POST /v1/videos/generations`