FLUX.1 [dev]

POST/v1/run

Flux 1 Dev is BFL's intelligent image editing model. Transform, retouch, and reimagine existing images using text prompts - from background replacement to artistic style conversion.

Request body

Submit an async generation request. The model field selects the model; other fields are model-specific input parameters.

stringmodelrequired

Model identifier. Set to bfl/flux-1/dev/image-to-image.

Default: bfl/flux-1/dev/image-to-image

stringpromptrequired

The prompt to generate an image from.

stringimagerequired

The URL of the image to generate an image from.

Optional<number>guidance_scale

The CFG (Classifier Free Guidance) scale is a measure of how close you want the model to stick to your prompt when looking for a related image to show you.

Range: 1 to 20

Default: 3.5

Optional<integer>num_inference_steps

The number of inference steps to perform.

Range: 10 to 50

Default: 40

Optional<number>strength

The strength of the initial image. Higher strength values are better for this model.

Range: 0.01 to 1

Default: 0.95

Optional<string>output_format

The format of the generated image.

Allowed values: jpeg, png

Default: jpeg

Optional<integer>seed

The same seed and the same prompt given to the same version of the model will output the same image every time.

Response Schema

The submit endpoint returns an accepted generation task. Poll the result endpoint with the returned id for terminal outputs or errors.

Optional<string>error

Error message if the task failed. Empty on success.

stringidrequired

Unique identifier for the generation task.

Optional<string>model

Model ID used for the prediction.

Optional<array>outputs

Array of generated content. Empty when status is not completed.

stringstatusrequired

Status of the task: pending, running, completed, failed, or timeout.

Allowed values: pending, running, completed, failed, timeout

Model capabilities

array<string>capability_tagsrequired

Capabilities declared by the model registry.

Default: image-to-image

stringexecution_moderequired

Execution mode declared by the model registry.

Default: async

# 1. Submit a generation request
curl -X POST https://api.sandbase.ai/v1/run \
  -H "Authorization: Bearer $SANDBASE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "bfl/flux-1/dev/image-to-image",
  "prompt": "A cat dressed as a wizard with a background of a mystic forest.",
  "image": "https://static.sandbase.ai/examples/bfl/flux-1/dev/image-to-image/input_image_0.png",
  "output_format": "jpeg"
}'

# 2. If the response is still running, poll the returned id
curl https://api.sandbase.ai/v1/run/run_abc123 \
  -H "Authorization: Bearer $SANDBASE_API_KEY"

Response202 Accepted

{
  "id": "run_abc123",
  "model": "bfl/flux-1/dev/image-to-image",
  "status": "running",
  "outputs": []
}