Model API

Stable Audio 3 Medium Base

Stable Audio 3 Medium Base audio outpainting is the foundational 1.4 billion parameter checkpoint that extends existing stereo audio with causal continuation guided by text prompts.

Model id

Use this in every request

stable-audio-3/medium/base/audio-outpainting

This model has other modes with their own ids: stable-audio-3/medium/base/text-to-audio, stable-audio-3/medium/base/audio-to-audio, stable-audio-3/medium/base/audio-inpainting.

Run it

Quote the input, start the generation with the quote, then poll the job. Set RAYWAKE_API_KEY first; see Authentication.

# 1. Price the exact input (quotes are valid for up to 10 minutes)
curl -s https://api.raywake.com/v1/quotes \
  -H "Authorization: Bearer $RAYWAKE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "stable-audio-3/medium/base/audio-outpainting",
  "input": {
    "prompt": "A red ceramic cup on a wooden table, soft morning light",
    "audio_url": "https://example.com/input.mp3"
  }
}'

# 2. Start the generation with the quote_id from step 1
curl -s https://api.raywake.com/v1/generate \
  -H "Authorization: Bearer $RAYWAKE_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: $(uuidgen)" \
  -d '{"model": "stable-audio-3/medium/base/audio-outpainting", "quote_id": "QUOTE_ID", "input": {"prompt":"A red ceramic cup on a wooden table, soft morning light","audio_url":"https://example.com/input.mp3"}}'

# 3. Poll until the status is terminal
curl -s https://api.raywake.com/v1/jobs/JOB_ID \
  -H "Authorization: Bearer $RAYWAKE_API_KEY"

Input

Input fields for stable-audio-3/medium/base/audio-outpainting
Name	Type	Description
`negative_prompt`	string	Text description of qualities to avoid in the output.
`num_inference_steps`	integer	Number of sampling steps. Base (non-distilled) checkpoints typically need ~50 for good quality. Default: `50`
`guidance_scale`	number	Classifier-free guidance scale. Higher values follow the prompt more strictly; ~7.0 is a good starting point for base checkpoints. Default: `7`
`seed`	integer	Random seed for reproducible outputs. Omit for a random seed.
`enable_prompt_expansion`	boolean	If True, the prompt will be expanded using an LLM for more detailed and higher quality results. Default: `false`
`sync_mode`	boolean	If True, the audio is returned inline as a data URI and the result is not saved to the request history. Default: `false`
`output_format`	string (enum)	Container format for the generated audio output. Default: `mp3` One of: `mp3`, `wav`, `flac`, `ogg`, `opus`, `m4a`, `aac`
`bitrate`	string	Audio bitrate for compressed output formats (e.g., mp3, aac, opus). Format e.g. '192k' or '320k'. Ignored for lossless formats (wav, flac). Default: `192k`
`prompt`required	string	Text description guiding the extension content.
`audio_url`required	string (URL)	Source audio to extend.
`extend_seconds_before`	number	Seconds of new audio to generate before the source audio. Default: `0`
`extend_seconds_after`	number	Seconds of new audio to generate after the source audio. Default: `0`

Output

A succeeded job lists its results under outputs, stored on our side. See Jobs for every field.

Job excerpt

"outputs": [
  { "type": "audio", "url": "https://…", "mime_type": "audio/mpeg", "thumbnail_url": null }
]

Pricing

up to, default options$0.09/ run

The exact charge for your input comes from a quote. How charges settle