> ## Documentation Index
> Fetch the complete documentation index at: https://docs.vidgo.ai/llms.txt
> Use this file to discover all available pages before exploring further.
# Kling O3 4K Text To Video
> Generate 3–15-second videos from text prompts with Kling O3 4K. Outputs 4K video. Supports single-shot and multi-shot generation. Explicitly set sound; multi-shot requires audio.
Submit with your Vidgo API key, then query [task status](/api-manual/task-management/status) using the returned task ID. An optional callback receives the final result. The submit response above is an initial-state illustration, not the completed video response.
## Parameters
Use model `kwaivgi/kling-video-o3-4k/text-to-video`. Put generation parameters inside `input`.
* **`prompt`**: Required when multi\_shots=false. Describe the scene, action and camera movement. Use nonblank text, up to 2,500 characters after trimming. Omit prompt when multi\_shots=true.
* **`multi_prompt`**: Required when multi\_shots=true; omit in single-shot mode. Supply at least one shot, each with a nonblank prompt of up to 2,500 characters and an integer duration of 1–12 seconds. Shot durations must sum to the top-level duration (3–15 seconds). Extra fields inside a shot are ignored.
* **`duration`**: Required integer from 3 to 15 seconds. In multi-shot mode, this must equal the sum of all shot durations. Credits are calculated using this value.
* **`multi_shots`**: Required: explicitly send false for a single shot or true for multiple shots. Single-shot mode requires prompt. Multi-shot mode requires multi\_prompt and sound=true, with no nonblank top-level prompt. Omitting this field is an error.
* **`sound`**: Required: explicitly send true to generate audio or false for video without audio. Single-shot mode accepts either value; multi-shot mode requires true.
* **`aspect_ratio`**: Optional: 16:9 (landscape), 9:16 (portrait) or 1:1 (square). Sets the video aspect ratio.
Use standard JSON numbers and booleans. For compatibility, integer strings such as "5" are accepted. Boolean strings true/1/yes/y/on mean true; false/0/no/n/off mean false. These strings are case-insensitive and trimmed. Numeric 1 and 0 are also accepted for boolean fields. Numeric and boolean prompt values are converted to text; 0, false and null are treated as empty. Objects and arrays are not accepted as prompts. Unsupported input fields, including reference\_image\_urls and kling\_elements, are rejected. HTTP(S) URLs must have a hostname and no embedded credentials.
## Pricing
50 credits/s with or without sound. Credits = duration × rate. Failed generation tasks are refunded.
## Default example: Rain Along the Stone Gallery
This is the same default example shown on the [model page](https://vidgo.ai/apis/models/kwaivgi/kling-video-o3-4k/text-to-video).
```json theme={null}
{
"model": "kwaivgi/kling-video-o3-4k/text-to-video",
"input": {
"duration": 4,
"sound": true,
"multi_shots": false,
"prompt": "Photoreal slow lateral dolly through an empty ancient temple gallery in rain. Weathered floral stone reliefs fill the foreground; rows of pillars recede toward a quiet courtyard. Water follows carved grooves and drips from worn edges, revealing mineral grains, chisel marks and moss in cracks. Soft overcast daylight, subtle wet highlights, stable architecture and rich fine detail. Audio: gentle rain and isolated drips; no music. No text, logos or watermarks.",
"aspect_ratio": "16:9"
}
}
```
[Download this video](https://cdn.vidgo.ai/apis/models/kwaivgi/kling-video-o3-4k/text-to-video/v1/01/output.mp4)
### Completed result from the status endpoint
`GET /api/generate/status/{task_id}`
The response below records this verified example. For a new generation, query the task ID returned by your own submission.
```json theme={null}
{
"code": 200,
"data": {
"task_id": "EE4XVIYVL5IAX4YG",
"status": "finished",
"files": [
{
"file_type": "video",
"file_url": "https://cdn.vidgo.ai/apis/models/kwaivgi/kling-video-o3-4k/text-to-video/v1/01/output.mp4"
}
],
"created_time": "2026-09-22T18:48:45",
"error_message": null,
"progress": 100
}
}
```
The API validates prompts up to 2,500 characters. Some multi-shot generation requests have failed when a shot prompt exceeded 512 characters. We recommend keeping each shot prompt within 512 characters; this recommendation does not change the API validation limit.
## OpenAPI
````yaml api-manual/video-series/kwaivgi-kling-video-o3-4k-text-to-video.json POST /api/generate/submit
openapi: 3.0.0
info:
title: Vidgo API - Kling O3 4K Text to Video
description: >-
Generate 3–15-second videos from text prompts with Kling O3 4K. Outputs 4K
video. Supports single-shot and multi-shot generation. Explicitly set sound;
multi-shot requires audio.
version: 1.0.0
servers:
- url: https://api.vidgo.ai
security:
- BearerAuth: []
paths:
/api/generate/submit:
post:
tags:
- Video Series
summary: Kling O3 4K Text to Video
description: >-
Submit a video generation task. duration, multi_shots and sound must be
explicitly provided. In multi-shot mode, provide multi_prompt, set
sound=true and make shot durations sum to duration. Invalid parameters
are rejected before image upload, task creation or charging.
operationId: submit_kwaivgi_kling_video_o3_4k_text_to_video
requestBody:
required: true
content:
application/json:
schema:
type: object
required:
- model
- input
additionalProperties: true
properties:
model:
type: string
enum:
- kwaivgi/kling-video-o3-4k/text-to-video
example: kwaivgi/kling-video-o3-4k/text-to-video
description: >-
Vidgo public model ID. Must be
`kwaivgi/kling-video-o3-4k/text-to-video`.
input:
type: object
required:
- duration
- multi_shots
- sound
description: >-
Video generation parameters. Use standard JSON numbers and
booleans. For compatibility, integer strings such as "5" are
accepted. Boolean strings true/1/yes/y/on mean true;
false/0/no/n/off mean false. These strings are
case-insensitive and trimmed. Numeric 1 and 0 are also
accepted for boolean fields. Numeric and boolean prompt
values are converted to text; 0, false and null are treated
as empty. Objects and arrays are not accepted as prompts.
properties:
prompt:
type: string
description: >-
Required when multi_shots=false. Describe the scene,
action and camera movement. Use nonblank text, up to
2,500 characters after trimming. Omit prompt when
multi_shots=true.
maxLength: 2500
minLength: 1
pattern: \S
multi_prompt:
type: array
items:
type: object
required:
- prompt
- duration
properties:
prompt:
type: string
description: >-
Required nonblank text for this shot, up to 2,500
characters after trimming.
maxLength: 2500
minLength: 1
pattern: \S
duration:
type: integer
description: >-
Required integer from 1 to 12 seconds for this
shot.
minimum: 1
maximum: 12
additionalProperties: true
description: >-
Required when multi_shots=true; omit in single-shot
mode. Supply at least one shot, each with a nonblank
prompt of up to 2,500 characters and an integer duration
of 1–12 seconds. Shot durations must sum to the
top-level duration (3–15 seconds). Extra fields inside a
shot are ignored.
minItems: 1
duration:
type: integer
description: >-
Required integer from 3 to 15 seconds. In multi-shot
mode, this must equal the sum of all shot durations.
Credits are calculated using this value.
minimum: 3
maximum: 15
multi_shots:
type: boolean
description: >-
Required: explicitly send false for a single shot or
true for multiple shots. Single-shot mode requires
prompt. Multi-shot mode requires multi_prompt and
sound=true, with no nonblank top-level prompt. Omitting
this field is an error.
sound:
type: boolean
description: >-
Required: explicitly send true to generate audio or
false for video without audio. Single-shot mode accepts
either value; multi-shot mode requires true.
aspect_ratio:
type: string
description: >-
Optional: 16:9 (landscape), 9:16 (portrait) or 1:1
(square). Sets the video aspect ratio.
enum:
- '1:1'
- '16:9'
- '9:16'
additionalProperties: false
oneOf:
- properties:
multi_shots:
enum:
- false
required:
- prompt
not:
required:
- multi_prompt
- properties:
multi_shots:
enum:
- true
sound:
enum:
- true
required:
- multi_shots
- multi_prompt
not:
required:
- prompt
callback_url:
type: string
nullable: true
description: >-
Optional public HTTP(S) endpoint for task completion
notifications. HTTPS is recommended. Omit, use null, or use
an empty string to disable callbacks.
description: >-
Keep model and callback_url at the root. Unknown root fields are
ignored; unsupported input fields are rejected.
examples:
basic:
summary: Rain Along the Stone Gallery
value:
model: kwaivgi/kling-video-o3-4k/text-to-video
input:
duration: 4
sound: true
multi_shots: false
prompt: >-
Photoreal slow lateral dolly through an empty ancient
temple gallery in rain. Weathered floral stone reliefs
fill the foreground; rows of pillars recede toward a quiet
courtyard. Water follows carved grooves and drips from
worn edges, revealing mineral grains, chisel marks and
moss in cracks. Soft overcast daylight, subtle wet
highlights, stable architecture and rich fine detail.
Audio: gentle rain and isolated drips; no music. No text,
logos or watermarks.
aspect_ratio: '16:9'
callback:
summary: Rain Along the Stone Gallery with callback
value:
model: kwaivgi/kling-video-o3-4k/text-to-video
input:
duration: 4
sound: true
multi_shots: false
prompt: >-
Photoreal slow lateral dolly through an empty ancient
temple gallery in rain. Weathered floral stone reliefs
fill the foreground; rows of pillars recede toward a quiet
courtyard. Water follows carved grooves and drips from
worn edges, revealing mineral grains, chisel marks and
moss in cracks. Soft overcast daylight, subtle wet
highlights, stable architecture and rich fine detail.
Audio: gentle rain and isolated drips; no music. No text,
logos or watermarks.
aspect_ratio: '16:9'
callback_url: https://your-domain.com/callback
responses:
'200':
description: Task submitted
content:
application/json:
schema:
type: object
required:
- code
- data
properties:
code:
type: integer
enum:
- 200
data:
type: object
required:
- task_id
- status
- created_time
properties:
task_id:
type: string
status:
type: string
enum:
- not_started
- running
- finished
- failed
created_time:
type: string
format: date-time
example:
code: 200
data:
task_id: task-submitted-example
status: not_started
created_time: '2026-09-22T00:00:00Z'
'400':
description: >-
Invalid input, unsupported tier, inaccessible media, or insufficient
credits
content:
application/json:
schema:
type: object
required:
- detail
properties:
detail:
oneOf:
- type: string
- type: object
additionalProperties: true
- type: array
items: {}
'401':
description: Invalid credentials
content:
application/json:
schema:
type: object
required:
- detail
properties:
detail:
oneOf:
- type: string
- type: object
additionalProperties: true
- type: array
items: {}
'403':
description: Access denied
content:
application/json:
schema:
type: object
required:
- detail
properties:
detail:
oneOf:
- type: string
- type: object
additionalProperties: true
- type: array
items: {}
'404':
description: Unknown or disabled model
content:
application/json:
schema:
type: object
required:
- detail
properties:
detail:
oneOf:
- type: string
- type: object
additionalProperties: true
- type: array
items: {}
'408':
description: Request timed out
content:
text/plain:
schema:
type: string
example: Request timeout
'422':
description: Invalid JSON or non-object request body
content:
application/json:
schema:
type: object
required:
- detail
properties:
detail:
oneOf:
- type: string
- type: object
additionalProperties: true
- type: array
items: {}
'429':
description: Rate or API key credit limit exceeded
content:
application/json:
schema:
type: object
required:
- detail
properties:
detail:
oneOf:
- type: string
- type: object
additionalProperties: true
- type: array
items: {}
'500':
description: Internal error
content:
application/json:
schema:
type: object
required:
- detail
properties:
detail:
oneOf:
- type: string
- type: object
additionalProperties: true
- type: array
items: {}
'502':
description: Unable to create the video generation task
content:
application/json:
schema:
type: object
required:
- detail
properties:
detail:
oneOf:
- type: string
- type: object
additionalProperties: true
- type: array
items: {}
'503':
description: This model is currently unavailable
content:
application/json:
schema:
type: object
required:
- detail
properties:
detail:
oneOf:
- type: string
- type: object
additionalProperties: true
- type: array
items: {}
components:
securitySchemes:
BearerAuth:
type: http
scheme: bearer
description: Use VIDGO_API_KEY.
````