curl --request POST \
  --url https://api.modellix.ai/api/v1/google/veo-3.1-fast-t2v \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "prompt": "Time-lapse of cherry blossoms falling in a peaceful Japanese garden"
}
'

{
  "code": 0,
  "message": "success",
  "data": {
    "status": "pending",
    "task_id": "task-t2v002",
    "model_id": "google/veo-3.1-fast-t2v",
    "get_result": {
      "method": "GET",
      "url": "https://api.modellix.ai/api/v1/tasks/task-t2v002"
    }
  }
}

{
  "code": 400,
  "message": "Invalid parameters: parameter 'prompt' is required"
}

{
  "code": 401,
  "message": "Authentication failed: invalid API key"
}

{
  "code": 429,
  "message": "Rate limit exceeded: 100 requests per minute, retry after 60 seconds"
}

{
  "code": 500,
  "message": "Internal server error"
}

Veo 3.1 Fast T2V

[Core Function] Veo 3.1 Fast T2V is a high-speed text-to-video model. [Strengths] It is heavily optimized for fast generation, delivering video content with natively synchronized audio at 1080p quickly. [Best For] Highly recommended for: rapid prototyping, quick visual iteration, and high-volume background video generation. [Limitations] Do NOT use this model if you require 4K resolution or maximum artistic detail. [Routing] Choose this model when the user emphasizes ‘fast’, ‘quick’, or ‘rapid’ video generation.

POST

/

google

/

veo-3.1-fast-t2v

curl --request POST \
  --url https://api.modellix.ai/api/v1/google/veo-3.1-fast-t2v \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "prompt": "Time-lapse of cherry blossoms falling in a peaceful Japanese garden"
}
'

{
  "code": 0,
  "message": "success",
  "data": {
    "status": "pending",
    "task_id": "task-t2v002",
    "model_id": "google/veo-3.1-fast-t2v",
    "get_result": {
      "method": "GET",
      "url": "https://api.modellix.ai/api/v1/tasks/task-t2v002"
    }
  }
}

{
  "code": 400,
  "message": "Invalid parameters: parameter 'prompt' is required"
}

{
  "code": 401,
  "message": "Authentication failed: invalid API key"
}

{
  "code": 429,
  "message": "Rate limit exceeded: 100 requests per minute, retry after 60 seconds"
}

{
  "code": 500,
  "message": "Internal server error"
}

Authorizations

Authorization

string

header

required

API Key authentication. Format: Bearer YOUR_API_KEY.

Body

application/json

Veo 3.1 and Veo 3.1 Fast text-to-video request. Supports prompt, negativePrompt, aspectRatio, duration, resolution (up to 4k), and personGeneration.

prompt

string

required

Video description text

Minimum string length: 1

Example:

"A majestic eagle soaring over snow-capped mountain peaks at sunrise"

negativePrompt

string

Text describing what to avoid in the generated video.

Example:

"blurry, low quality, distorted"

aspectRatio

enum<string>

default:16:9

Video aspect ratio

Available options:

16:9,

9:16

Example:

"16:9"

duration

enum<string>

Video duration in seconds (string type)

Available options:

4,

6,

8

Example:

"8"

resolution

enum<string>

Video resolution. Note: 1080p and 4k are only available for 8-second duration.

Available options:

720p,

1080p,

4k

Example:

"1080p"

personGeneration

enum<string>

Person generation policy

Available options:

allow_all

Example:

"allow_all"

Response

Task submitted successfully

code

integer

required

Response code, 0 indicates success

Example:

0

message

string

required

Response message

Example:

"success"

data

object

required

Detailed data about the submitted asynchronous task.

Show child attributes

Veo 3 1 fast i2v Veo 3 1 i2v