Ltx 2.3 Quality

POST/v1/run

Ltx 2.3 Quality by Lightricks - animate still images into dynamic videos with AI. Transform photos into cinematic clips with natural motion, camera movement, and optional audio generation.

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 lightricks/ltx-2.3-quality/image-to-video.

Default: lightricks/ltx-2.3-quality/image-to-video

stringpromptrequired

The prompt to guide the video generation.

stringimagerequired

The URL of the starting image.

Optional<string>resolution

The size of the generated video. 'auto' derives the size from the input image aspect ratio.

Allowed values: auto, square_hd, square, portrait_4_3, portrait_16_9, landscape_4_3, landscape_16_9

Default: auto

Optional<boolean>generate_audio

Whether to include audio in the returned video. When disabled, the final MP4 is returned without an audio track.

Default: true

Optional<number>guidance_scale

Classifier-free guidance scale. The default is tuned for fast, high-quality generation.

Range: 1 to 20

Default: 1

Optional<integer>num_inference_steps

Number of inference steps. Defaults to 15 and can be increased up to 30.

Range: 8 to 30

Default: 15

Optional<string>video_quality

The quality preset of the generated video.

Allowed values: low, medium, high, maximum

Default: high

Optional<string>video_write_mode

The write mode of the generated video.

Allowed values: fast, balanced, small

Default: balanced

Optional<integer>num_frames

The number of frames to generate.

Range: 9 to 481

Default: 121

Optional<number>image_strength

Conditioning strength on the start image. 1.0 = exact first-frame match, lower = more freedom for the model.

Range: 0 to 1

Default: 0.7

Optional<number>frames_per_second

Frames per second of the generated video.

Range: 1 to 60

Default: 24

Optional<integer>seed

Random seed for reproducibility. If None, a random seed is chosen.

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": "lightricks/ltx-2.3-quality/image-to-video",
  "prompt": "A woman stands still amid a busy neon-lit street at night. The camera slowly dollies in toward her face as people blur past, their motion emphasizing her calm presence.",
  "image": "https://storage.googleapis.com/falserverless/example_inputs/ltxv-2-i2v-input.jpg"
}'

# 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": "lightricks/ltx-2.3-quality/image-to-video",
  "status": "running"
}