Flux 3 Image to Video

POST/v1/run

Flux 3 is BFL's image-to-video AI model. Bring static images to life with fluid animation, consistent character motion, and professional-grade video output.

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-3/image-to-video.

Default: bfl/flux-3/image-to-video

stringpromptrequired

The text prompt describing the video you want to generate.

stringimagerequired

URL of the image the video starts from (PNG, JPEG, or WebP).

Optional<string>resolution

Resolution of the generated video.

Allowed values: 720p, 1080p

Default: 720p

Optional<integer>duration

Video duration in seconds (5-20).

Allowed values: 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20

Default: 5

Optional<boolean>generate_audio

Whether to generate audio for the video.

Default: true

Optional<string>aspect_ratio

Output aspect ratio. Follows the input when omitted.

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

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-video

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-3/image-to-video",
  "prompt": "A red panda walks along a mossy log in a sunlit forest, one continuous unbroken shot. Ambient birdsong and rustling leaves.",
  "image": "https://storage.googleapis.com/falserverless/example_inputs/veo31_i2v_input.jpg",
  "duration": 5,
  "aspect_ratio": "21:9"
}'

# 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-3/image-to-video",
  "status": "running"
}