FLUX.1 Krea [dev]

POST/v1/run

Flux 1 Krea by BFL - AI-powered image editing, style transfer, and transformation. Edit photos with natural language instructions, remove backgrounds, change styles, and enhance images effortlessly.

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/krea/image-to-image.

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

stringpromptrequired

The prompt to generate an image from.

stringimagerequired

The URL of the image to generate an image from.

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.

Optional<integer>num_inference_steps

Number of denoising or inference steps to run when supported.

Range: 10 to 50

Default: 40

Optional<number>guidance_scale

Request parameter supported by this model.

Range: 1 to 20

Default: 4.5

Response Schema

The submit endpoint returns a run response. If its status is pending or running, poll GET /v1/run/{id} with the returned opaque ID until it reaches a terminal state.

stringidrequired

Opaque SandBase run identifier. Use it exactly as returned; no prefix is guaranteed.

stringstatusrequired

Current public run status.

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

Optional<string>model

Public SandBase model name used for this run.

Optional<array<object>>outputs

Present only for completed runs. Each object is capability-specific; inspect the selected model schema for its fields.

Optional<object>error

Present only for failed or timeout runs. Contains a public error type and sanitized message.

Optional<string>error.type

Stable public error category.

Optional<string>error.message

Sanitized error message safe to show to clients.

Optional<object>usage

Usage details when available.

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/krea/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/krea/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/f3d2e8a1-7c4b-4a12-9d2e-123456789abc \
  -H "Authorization: Bearer $SANDBASE_API_KEY"

Response202 Accepted

{
  "id": "f3d2e8a1-7c4b-4a12-9d2e-123456789abc",
  "model": "bfl/flux-1/krea/image-to-image",
  "status": "running"
}