FLUX 3 Klein Text to Image

curl --request POST \
  --url https://api.vidgo.ai/api/generate/submit \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "model": "blackforestlabs/flux-3-klein/text-to-image",
  "input": {
    "prompt": "Studio product photo of a matte black water bottle on wet slate, soft rim light",
    "n": 1,
    "resolution": "1K",
    "size": "1:1",
    "output_format": "png"
  }
}
'

{
  "code": 200,
  "data": {
    "task_id": "task-unified-1762160000-abc123",
    "status": "not_started",
    "created_time": "2026-11-03T10:30:00"
  }
}

{
  "detail": "<string>"
}

{
  "detail": "<string>"
}

{
  "detail": "<string>"
}

{
  "detail": "<string>"
}

Request timeout

{
  "detail": "<string>"
}

{
  "detail": "<string>"
}

{
  "detail": "<string>"
}

{
  "detail": "<string>"
}

{
  "detail": "<string>"
}

POST

api

generate

submit

curl --request POST \
  --url https://api.vidgo.ai/api/generate/submit \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "model": "blackforestlabs/flux-3-klein/text-to-image",
  "input": {
    "prompt": "Studio product photo of a matte black water bottle on wet slate, soft rim light",
    "n": 1,
    "resolution": "1K",
    "size": "1:1",
    "output_format": "png"
  }
}
'

{
  "code": 200,
  "data": {
    "task_id": "task-unified-1762160000-abc123",
    "status": "not_started",
    "created_time": "2026-11-03T10:30:00"
  }
}

{
  "detail": "<string>"
}

{
  "detail": "<string>"
}

{
  "detail": "<string>"
}

{
  "detail": "<string>"
}

Request timeout

{
  "detail": "<string>"
}

{
  "detail": "<string>"
}

{
  "detail": "<string>"
}

{
  "detail": "<string>"
}

{
  "detail": "<string>"
}

After submission, a task_id will be returned. If you provided a callback_url, when the task status becomes finished or failed, a POST request will be sent to the callback_url.
Regardless of whether callback_url is provided, you can retrieve the result through the unified Query Task Status endpoint.

FLUX 3 Klein Text to Image creates images from a prompt at 1K, 2K or 4K, using seven aspect-ratio presets or an exact custom size. It suits product shots, marketing visuals, concept art and high-volume image pipelines where fast turnaround matters. FLUX 3 Klein is the compact member of Black Forest Labs’ FLUX 3 image family, built for fast generation and instruction-based editing. Vidgo exposes it as two model IDs: Text to Image and Edit.

Models

blackforestlabs/flux-3-klein/text-to-image — Text-to-image with FLUX 3 Klein, 1–4 images at 1K, 2K or 4K.

Features

Text-to-image from a single prompt.
Three resolution tiers: 1K, 2K, 4K.
Seven aspect-ratio presets, or a custom WIDTHxHEIGHT from 256 to 4096 px per side.
PNG, JPEG or WebP output, 1–4 images per request.

Required parameters

prompt (string): The image you want. Must not be blank.

Optional parameters

n (integer): Number of images, 1–4. Default 1.
resolution (string): 1K, 2K or 4K. Default 1K. See Resolution.
size (string): Preset or custom WIDTHxHEIGHT. Default 1:1. See Resolution.
output_format (string): png, jpeg or webp. Default png.
enable_safety_checker (boolean): Upstream safety checker. Default true.

Resolution

With a preset size (1:1, 4:3, 3:4, 16:9, 9:16, 3:2, 2:3), the image is scaled so its long edge matches the tier: 1K → 1024 px, 2K → 2048 px, 4K → 4096 px.
With a custom size such as 1920x1080, each side must be 256–4096 and a multiple of 16, and you must send resolution matching the long edge: up to 1024 → 1K, up to 2048 → 2K, above 2048 → 4K. A mismatch returns 400.

`resolution`	Long edge (presets)	Custom long edge
`1K`	1024 px	≤ 1024 px
`2K`	2048 px	1025–2048 px
`4K`	4096 px	2049–4096 px

Output

The finished task returns one file per requested image (n) in the files array of Query Task Status and the callback payload.

Examples

1K square image: a product photo at 1:1, 1K, PNG.
Custom 4K size, two JPEGs, with callback: size: 3840x2160 with resolution: 4K (long edge above 2048), n: 2, JPEG, with a callback_url.

Notes

This ID takes text only; image_urls returns 400. To edit or combine images, use FLUX 3 Klein Edit.
Fields not listed above return 400. model and callback_url belong at the request root, not inside input.
Credits are reserved at submission and depend on resolution and n. Text-to-image and edit use the same rates. A failed task is refunded in full. See the pricing page for current rates.

Authorizations

Authorization

string

header

required

All API endpoints require Bearer Token authentication

Get your API Key:

Go to Dashboard → API Key (API Key Management Page) to get your API Key

Add it to the request header:

Authorization: Bearer VIDGO_API_KEY

Body

application/json

model

string

required

Model ID. Use blackforestlabs/flux-3-klein/text-to-image.

Example:

"blackforestlabs/flux-3-klein/text-to-image"

input

object

required

Generation parameters.

Show child attributes

callback_url

string<uri> | null

Optional public HTTP(S) endpoint that receives a POST when the task becomes finished or failed. HTTPS is recommended. Omit it, or send null or an empty string, to disable callbacks.

Example:

"https://your-domain.com/callback"

Response

Task submitted

code

enum<integer>

required

HTTP status code.

Available options:

200

data

object

required

Show child attributes

​Models

​Features

​Required parameters

​Optional parameters

​Resolution

​Output

​Examples

​Notes

Authorizations

Body

Response

Models

Features

Required parameters

Optional parameters

Resolution

Output

Examples

Notes