Ltx 2.3 Quality

POST/v1/run

Ltx 2.3 Quality Hdr is Lightricks's video-to-video AI model. Transform, enhance, and edit video content using text prompts - from style changes to object manipulation and scene modification.

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/hdr.

Default: lightricks/ltx-2.3-quality/hdr

stringpromptrequired

The prompt to guide generation.

Optional<string>video

SDR input video to lift into HDR. This mode is video-conditioned.

Optional<string>resolution

Output video size. The output is generated at up to ~720p (shorter side capped at 704px); larger requested sizes are scaled down, preserving the 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<integer>seed

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

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>frames_per_second

Frames per second of the generated video.

Range: 1 to 60

Default: 24

Optional<string>video_quality

The quality preset of the generated video.

Allowed values: low, medium, high, maximum

Default: high

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: video-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/hdr",
  "prompt": "A sunset over the Pacific Ocean, vibrant orange and purple sky, deep contrast, cinematic HDR.",
  "video": "https://static.sandbase.ai/examples/input.mp4"
}'

# 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/hdr",
  "status": "running"
}