Skip to content
Model infoModelsSnapshot: 15 Oct 2026

Stability AI / Stable Audio

Stable Audio 2.5

Music and sound generation with audio transformation and inpainting.

availableClosed weightsMusic generationSound effects generationAudio processing
Official documentation (opens in a new tab)Reviewed 13 Oct 2026
12 of 23 specification fields collected
Audio output duration1–190 secondsSee specification notes below
Audio formatsMP3, WAVSee specification notes below
Input billingSee ratesStability AI API
Output billingSee ratesPublished units and conditions below

Specifications

Provider-documented facts. “Not collected” means we have not verified that field yet, not that the feature is unsupported.

Context / input limit
Not collected
Maximum output
Not collected
Reasoning
Not collected
Tool calling
Not collected
Structured output
Not collected
Streaming
Not collected
Batch processing
Not collected
Fine-tuning
SupportedSource for Fine-tuning (opens in a new tab)

Provider-assisted enterprise customization on an organization’s sound library. Not a self-service fine-tuning API.

Knowledge cutoff
Not collected
Parameters
Not collected
Architecture
Audio diffusion model post-trained with Adversarial Relativistic-Contrastive (ARC) trainingSource for Architecture (opens in a new tab)
Languages
Not collected
Context caching
Not collected
Output duration
1–190 secondsSource for Output duration (opens in a new tab)

Request schema limit. Rounded marketing descriptions say six or three minutes respectively.

Maximum prompt characters
10,000 charactersSource for Maximum prompt characters (opens in a new tab)
Audio duration limits
6–190 seconds for input audioSource for Audio duration limits (opens in a new tab)
Generation modes
text-to-audio, audio-to-audio, inpaintSource for Generation modes (opens in a new tab)

Access & pricing

Prices belong to an endpoint and billing tier. A provider listing does not guarantee access for every account or region.

API model ID
stable-audio-2.5
Access
Developer account, API key and credits required. Public documentation and contracts reviewed; no inference request was made.
Regions
Not established for this endpoint; account availability is not a data-residency guarantee.
API endpoint URL
POST https://api.stability.ai/v2beta/audio/stable-audio-2/text-to-audioSource for API endpoint URL (opens in a new tab)
Request mode
Returns the completed media in the responseSource for Request mode (opens in a new tab)

JSON or base64 transport does not establish structured model output, streaming or a batch API.

Maximum prompt characters
10,000 charactersSource for Maximum prompt characters (opens in a new tab)
Seed control
0–4,294,967,294; zero or an omitted seed selects randomnessSource for Seed control (opens in a new tab)
Output duration
1–190 secondsSource for Output duration (opens in a new tab)

Request schema limit. Rounded marketing descriptions say six or three minutes respectively.

Prices retain their published currencies and billing units below.

Published billing units · original currency · observed 13 Oct 2026
CategoryUsageRateUnit
Audiotext-to-audio1$0.08successful generation

Rate conditions

  1. 8 credits × published $0.01/credit. Flat rate for the selected model per successful result; duration does not change this published quote. No text-token or per-question conversion.
Pricing source (opens in a new tab)

Data & enterprise terms

Stability terms permit using content to improve services and describe a training opt-out. This is not a default no-training or zero-retention guarantee. Partner contracts may differ; enterprise terms must be verified separately.

Read the service policy (opens in a new tab)
API model ID
stable-audio-2.5
Access
Developer account, API key and credits required. Public documentation and contracts reviewed; no inference request was made.
Regions
Not established for this endpoint; account availability is not a data-residency guarantee.
API endpoint URL
POST https://api.stability.ai/v2beta/audio/stable-audio-2/audio-to-audioSource for API endpoint URL (opens in a new tab)
Request mode
Returns the completed media in the responseSource for Request mode (opens in a new tab)

JSON or base64 transport does not establish structured model output, streaming or a batch API.

Maximum prompt characters
10,000 charactersSource for Maximum prompt characters (opens in a new tab)
Seed control
0–4,294,967,294; zero or an omitted seed selects randomnessSource for Seed control (opens in a new tab)
Output duration
1–190 secondsSource for Output duration (opens in a new tab)

Request schema limit. Rounded marketing descriptions say six or three minutes respectively.

Audio duration limits
6–190 seconds for input audioSource for Audio duration limits (opens in a new tab)
Request limits
50 MB maximum request sizeSource for Request limits (opens in a new tab)

The documentation writes the suffix as Mb; no different binary megabyte convention is inferred.

Prices retain their published currencies and billing units below.

Published billing units · original currency · observed 13 Oct 2026
CategoryUsageRateUnit
Audioaudio-to-audio1$0.08successful generation

Rate conditions

  1. 8 credits × published $0.01/credit. Flat rate for the selected model per successful result; duration does not change this published quote. No text-token or per-question conversion.
Pricing source (opens in a new tab)

Data & enterprise terms

Stability terms permit using content to improve services and describe a training opt-out. This is not a default no-training or zero-retention guarantee. Partner contracts may differ; enterprise terms must be verified separately.

Read the service policy (opens in a new tab)
API model ID
Not collected

No pinned model selector established for this access path.

Access
Developer account, API key and credits required. Public documentation and contracts reviewed; no inference request was made.
Regions
Not established for this endpoint; account availability is not a data-residency guarantee.
API endpoint URL
POST https://api.stability.ai/v2beta/audio/stable-audio-2/inpaintSource for API endpoint URL (opens in a new tab)
Request mode
Returns the completed media in the responseSource for Request mode (opens in a new tab)

JSON or base64 transport does not establish structured model output, streaming or a batch API.

Maximum prompt characters
10,000 charactersSource for Maximum prompt characters (opens in a new tab)
Seed control
0–4,294,967,294; zero or an omitted seed selects randomnessSource for Seed control (opens in a new tab)
Output duration
1–190 secondsSource for Output duration (opens in a new tab)

Request schema limit. Rounded marketing descriptions say six or three minutes respectively.

Audio duration limits
6–190 seconds for input audioSource for Audio duration limits (opens in a new tab)
Request limits
50 MB maximum request sizeSource for Request limits (opens in a new tab)

The documentation writes the suffix as Mb; no different binary megabyte convention is inferred.

Audio infill
One mask_start/mask_end interval within 0–190 secondsSource for Audio infill (opens in a new tab)

The research discusses more editing modes, but the current API exposes one interval.

Prices retain their published currencies and billing units below.

Published billing units · original currency · observed 13 Oct 2026
CategoryUsageRateUnit
Audioinpaint1$0.08successful generation

Rate conditions

  1. 8 credits × published $0.01/credit. Flat rate for the selected model per successful result; duration does not change this published quote. No text-token or per-question conversion.
Pricing source (opens in a new tab)

Data & enterprise terms

Stability terms permit using content to improve services and describe a training opt-out. This is not a default no-training or zero-retention guarantee. Partner contracts may differ; enterprise terms must be verified separately.

Read the service policy (opens in a new tab)

Stability enterprise deployment

Provider source (opens in a new tab)
API model ID
Not collected

No pinned model selector established for this access path.

Access
Negotiated on-premises deployment and provider-assisted customization. Contact-only pricing; no public inference endpoint or rate established.
Regions
Not established for this endpoint; account availability is not a data-residency guarantee.

Endpoint pricing has not been collected. Check the provider for applicable rates.

Data & enterprise terms

Stability terms permit using content to improve services and describe a training opt-out. This is not a default no-training or zero-retention guarantee. Partner contracts may differ; enterprise terms must be verified separately.

Read the service policy (opens in a new tab)

Caching

Caching can reuse earlier input processing. Availability, lifetime and billing depend on the endpoint. A cache hit still generates a new response.

01 / INITIAL INPUTProcess & retain

The system processes eligible input and retains reusable state.

02 / LATER REQUESTCheck available state

Reuse depends on matching input, session state and the cache policy.

03 / CACHE HITReuse & generate

Reusing state can reduce repeated work. Any charges follow the billing rules below.

Stability AI API

stable-audio-2.5
Not verified
How it works
Not collected
Minimum reusable input
Not collected
Lifetime & refresh
Not collected
How to enable it
Not collected
Usage fields
Not collected
Billing rules
Not collected
Limits & data boundaries
Not collected

No verified cache rate for this endpoint. An empty rate is not a zero charge.

Stability AI API

stable-audio-2.5
Not verified
How it works
Not collected
Minimum reusable input
Not collected
Lifetime & refresh
Not collected
How to enable it
Not collected
Usage fields
Not collected
Billing rules
Not collected
Limits & data boundaries
Not collected

No verified cache rate for this endpoint. An empty rate is not a zero charge.

Stability AI API

Not verified
How it works
Not collected
Minimum reusable input
Not collected
Lifetime & refresh
Not collected
How to enable it
Not collected
Usage fields
Not collected
Billing rules
Not collected
Limits & data boundaries
Not collected

No verified cache rate for this endpoint. An empty rate is not a zero charge.

Stability enterprise deployment

Not verified
How it works
Not collected
Minimum reusable input
Not collected
Lifetime & refresh
Not collected
How to enable it
Not collected
Usage fields
Not collected
Billing rules
Not collected
Limits & data boundaries
Not collected

No verified cache rate for this endpoint. An empty rate is not a zero charge.

What the measurements say

No benchmark observations have been added for this model. We do not turn a vendor description into a performance score.

Latency and throughput depend on the host, request size, reasoning settings and load. There is no measured speed or global usage figure in this record.

The record behind the model

Why it is included

The official research distinguishes Stable Audio Open, trained on a different dataset and released with downloadable weights, from the proprietary Stable Audio 2 line. The named commercial release is offered through hosted APIs or negotiated enterprise licensing, not that public Open checkpoint.

Classification evidence (opens in a new tab)

Lifecycle dates

Official launch10 Sept 2025Source (opens in a new tab)

Sources reviewed