Stable Audio 3 Medium | EmpirioLabs AI Docs

Stability AI · Audio Generation

POST /v1/audio/generations

Stability AI text-to-audio model for music and sound effects, 44.1 kHz stereo clips up to 380 seconds, with length, step and seed controls.

At a glance

Field	Value
Model id	`stable-audio-3-medium`
Model release date	2026-05-20
Input modalities	Text
Output modalities	Audio
Context window	-
Weight precision	FP16
Features	music_generation, text_to_audio, sound_effects, seed_control
Native inference	Yes
New	Yes
Supported endpoints	`POST /v1/audio/generations`
Alternate model ids	`stabilityai/stable-audio-3-medium`

Pricing

Charge	Spec	Rate
Generation	per request	$0.035

Example request

curl https://api.empiriolabs.ai/v1/audio/generations \
  -H 'Authorization: Bearer $EMPIRIOLABS_API_KEY' \
  -H 'Content-Type: application/json' \
  -d '{"model": "stable-audio-3-medium", "prompt": "rain on a tin roof", "audio_duration": 8}'

Parameters

Parameter	Type	Required	Default	Description
`prompt`	string	yes	-	The music or sound to generate.
`audio_duration`	number	no	`30`	Clip length in seconds, from 1 to 380. · Range: 1 – 380
`num_inference_steps`	number	no	`8`	Sampling steps, from 4 to 8. · Range: 4 – 8
`seed`	number	no	-	Random seed. Leave unset for a random one. · Range: 0 – 2147483647
`format`	enum	no	`"mp3"`	Audio file format of the generated clip. · Allowed: `mp3`, `wav`, `flac`, `ogg`
`response_format`	enum	no	`"url"`	Return a signed media URL by default, or base64 JSON when requested. · Allowed: `url`, `b64_json`
`return_base64`	boolean	no	false	Compatibility alias for response_format=b64_json.

Notes

Generates music and sound effects from text: 44.1 kHz stereo, from 1 to 380 seconds per clip. Powered by Stability AI.

Input

A text prompt describing the music or sound: genre, instruments, mood, tempo, or the effect.
audio_duration sets the length in seconds, from 1 to 380. The default is 30.
num_inference_steps from 4 to 8. The default is 8.
seed repeats a result. Negative prompts, lyrics and audio inputs are not supported.

Output

MP3 by default, or WAV, FLAC or Ogg with format.
A signed URL by default, or base64 with response_format set to b64_json.

Billing

Billed per clip, whatever its length. A request that fails is not billed.

Weights

FP16.

Machine-readable schema: GET https://api.empiriolabs.ai/v1/models/stable-audio-3-medium.