Arabic (Modern Standard), Chinese (Mandarin), Czech, Dutch (Belgian), Dutch (Netherlands), English (Australian), Korean, SwedishSource for Languages (opens in a new tab)
Context caching
Not collected
Access & pricing
Prices belong to an endpoint and billing tier. A provider listing does not guarantee access for every account or region.
Select a voice or call the documented feature route; no separate model_id is exposed.
Access
Historical family reference. See the voice list for original identifiers and the lifecycle notes for migrations. These are not current pinned access routes.
Regions
Use the service-instance URL for the provisioned region. Product-edition and voice-specific availability apply; no universal residency guarantee inferred.
Endpoint pricing has not been collected. Check the provider for applicable rates.
Data & enterprise terms
Retention, training use, regional processing and enterprise terms have not been summarized for this endpoint.
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.
IBM Watson Text to Speech (historical)
Not verified
No provider-priced inference cache contract verified. Client-side audio reuse is not provider prompt caching.
How it works
Not collected
No provider-priced inference cache contract verified. Client-side audio reuse is not provider prompt caching.
Minimum reusable input
Not collected
No provider-priced inference cache contract verified. Client-side audio reuse is not provider prompt caching.
Lifetime & refresh
Not collected
No provider-priced inference cache contract verified. Client-side audio reuse is not provider prompt caching.
How to enable it
Not collected
No provider-priced inference cache contract verified. Client-side audio reuse is not provider prompt caching.
Usage fields
Not collected
No provider-priced inference cache contract verified. Client-side audio reuse is not provider prompt caching.
Billing rules
Not collected
No provider-priced inference cache contract verified. Client-side audio reuse is not provider prompt caching.
Limits & data boundaries
Not collected
No provider-priced inference cache contract verified. Client-side audio reuse is not provider prompt caching.
No verified cache rate for this endpoint. An empty rate is not a zero charge.
Voice choices
17 voices
Choose a voice within Watson Text to Speech: Legacy Neural. These are API voice identifiers, not additional model releases. Source links document each voice.
Published voice catalog
Voice / API ID
Language & accent
Delivery
Omarar-MS_OmarVoice
Arabic Modern Standard
Historical voice selector. Original non-V3 neural voices, removed from the hosted service on 31 March 2023.Voice source (opens in a new tab)
LiNazh-CN_LiNaVoice
Chinese Mandarin
Historical voice selector. Original non-V3 neural voices, removed from the hosted service on 31 March 2023.Voice source (opens in a new tab)
WangWeizh-CN_WangWeiVoice
Chinese Mandarin
Historical voice selector. Original non-V3 neural voices, removed from the hosted service on 31 March 2023.Voice source (opens in a new tab)
ZhangJingzh-CN_ZhangJingVoice
Chinese Mandarin
Historical voice selector. Original non-V3 neural voices, removed from the hosted service on 31 March 2023.Voice source (opens in a new tab)
Alenacs-CZ_AlenaVoice
Czech
Historical voice selector. Original non-V3 neural voices, removed from the hosted service on 31 March 2023.Voice source (opens in a new tab)
Adelenl-BE_AdeleVoice
Dutch Belgian
Historical voice selector. Original non-V3 neural voices, removed from the hosted service on 31 March 2023.Voice source (opens in a new tab)
Bramnl-BE_BramVoice
Dutch Belgian
Historical voice selector. Original non-V3 neural voices, removed from the hosted service on 31 March 2023.Voice source (opens in a new tab)
Emmanl-NL_EmmaVoice
Dutch Netherlands
Historical voice selector. Original non-V3 neural voices, removed from the hosted service on 31 March 2023.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
IBM documents this proprietary Watson speech service model or managed voice family. The service exposes recognition/voice selectors, not downloadable trained checkpoints. Closed-weight classification is inferred for the product model; public Granite Speech research releases and referenced open research implementations are separate.
