Stable Audio 3 Small Music

POST/v1/run

Stable Audio 3 Small Music by Stability AI is a fast, low-cost music generator producing tracks up to 2 minutes from a text prompt.

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 stability-ai/stable-audio/3/small/music/text-to-audio.

Default: stability-ai/stable-audio/3/small/music/text-to-audio

stringpromptrequired

Text description of the audio to generate.

Optional<string>negative_prompt

Qualities to avoid in the output.

Default:

Optional<string>output_format

Audio container format.

Allowed values: mp3, wav, flac, ogg, opus, m4a, aac

Default: mp3

Optional<integer>seed

Random seed for reproducible outputs.

Optional<integer>duration

Duration in seconds (1–120).

Range: 1 to 120

Default: 30

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: text-to-music

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": "stability-ai/stable-audio/3/small/music/text-to-audio",
  "prompt": "An anthemic Pop Rock instrumental that fills your head with nostalgic thoughtfulness",
  "duration": 30,
  "output_format": "mp3"
}'

# 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": "stability-ai/stable-audio/3/small/music/text-to-audio",
  "status": "running"
}