Emotion, pitch, volume and prosody instructions are advertised; the official example leaves these fields disabled because some inputs cause playback errorsSource for Voice controls (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.
Official cookbook uses wss://api.smallest.ai/waves/v1/tts/live with a Bearer API key. The general HTTP schema currently lists only v3.1 pools.
Regions
Automatic routing to Mumbai, India or Oregon, USA; api.india.smallest.ai and api.us.smallest.ai pin a region. Language availability can differ by region.
Endpoint pricing has not been collected. Check the provider for applicable rates.
Data & enterprise terms
Content is retained unless an eligible Enterprise data policy is enabled. Options: no content storage, a 24-hour to 90-day window, or x-expire-content: true for seven-day expiry. On other plans the header is ignored. Billing/usage metadata remains; settings are not retroactive. TTS saved history is excluded from window expiry. Speech-to-speech and cloning are not expressly covered.
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.
Smallest AI API
lightning_v3.2
Not verified
No discounted prompt-cache contract verified for this model/access route. Audio continuity and model-weight storage are separate features.
How it works
Not collected
No discounted prompt-cache contract verified for this model/access route. Audio continuity and model-weight storage are separate features.
Minimum reusable input
Not collected
No discounted prompt-cache contract verified for this model/access route. Audio continuity and model-weight storage are separate features.
Lifetime & refresh
Not collected
No discounted prompt-cache contract verified for this model/access route. Audio continuity and model-weight storage are separate features.
How to enable it
Not collected
No discounted prompt-cache contract verified for this model/access route. Audio continuity and model-weight storage are separate features.
Usage fields
Not collected
No discounted prompt-cache contract verified for this model/access route. Audio continuity and model-weight storage are separate features.
Billing rules
Not collected
No discounted prompt-cache contract verified for this model/access route. Audio continuity and model-weight storage are separate features.
Limits & data boundaries
Not collected
No discounted prompt-cache contract verified for this model/access route. Audio continuity and model-weight storage are separate features.
No verified cache rate for this endpoint. An empty rate is not a zero charge.
Voice choices
14 voices
Choose a voice within Lightning V3.2. These are API voice identifiers, not additional model releases. Source links document each voice.
Published voice catalog
Voice / API ID
Language & accent
Delivery
Abbieabbie
english british
Provider voice label: female. Language tags describe the voice; they do not override endpoint language restrictions.Voice source (opens in a new tab)
Sloanesloane
english american
Provider voice label: female. Language tags describe the voice; they do not override endpoint language restrictions.Voice source (opens in a new tab)
Wrenwren
english american
Provider voice label: female. Language tags describe the voice; they do not override endpoint language restrictions.Voice source (opens in a new tab)
Reedreed
english american
Provider voice label: male. Language tags describe the voice; they do not override endpoint language restrictions.Voice source (opens in a new tab)
Marlowemarlowe
english american
Provider voice label: female. Language tags describe the voice; they do not override endpoint language restrictions.Voice source (opens in a new tab)
Knoxknox
english american
Provider voice label: male. Language tags describe the voice; they do not override endpoint language restrictions.Voice source (opens in a new tab)
Tatetate
english american
Provider voice label: female. Language tags describe the voice; they do not override endpoint language restrictions.Voice source (opens in a new tab)
Kierankieran
english british
Provider voice label: male. Language tags describe the voice; they do not override endpoint language restrictions.Voice source (opens in a new tab)
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
Smallest retains rights in its AI models and prohibits model extraction. Its model cards name Smallest as developer; Electron, Hydra and Lightning v3.1 explicitly use proprietary licenses. Commercial self-hosting requires licensed artifacts and a license proxy, not an open-weight grant.
