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Flux 2 [klein] Realtime

POST/v1/run

Flux 2 Klein Realtime 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-2/klein/realtime.

Default: bfl/flux-2/klein/realtime

stringpromptrequired

The prompt to guide image editing.

Default: Turn this into "Living oil painting, melting gold and sapphire"

stringimagerequired

Base64-encoded image data URI for editing. CDN URLs are not supported for realtime. For optimal performance, use 704x704 JPEG images with 50% quality. Other sizes will be resized automatically.

Optional<integer>num_inference_steps

Number of denoising or inference steps to run when supported.

Range: 1 to 8

Default: 3

Optional<number>schedule_mu

Schedule mu for time shift. 2.3=default, lower=more even denoising, 0.3=nearly linear.

Range: 0.3 to 2.5

Default: 2.3

Optional<number>output_feedback_strength

Output feedback loop. 1.0 = pure noise (no feedback), 0.9 = 90% noise + 10% previous output latent.

Range: 0 to 1

Default: 1

Optional<boolean>enable_interpolation

Enable RIFE frame interpolation between consecutive frames (doubles output frames).

Default: false

Optional<string>aspect_ratio

The aspect ratio of the generated image.

Allowed values: 21:9, 16:9, 3:2, 4:3, 5:4, 1:1, 4:5, 3:4, 2:3, 9:16

Optional<integer>seed

Random seed for reproducibility.

Default: 35

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