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
23 voices
Choose a voice within Watson Text to Speech: Legacy Concatenative. These are API voice identifiers, not additional model releases. Source links document each voice.
Published voice catalog
Voice / API ID
Language & accent
Delivery
Birgitde-DE_BirgitVoice
German
Historical voice selector. Earlier concatenative synthesis, retained as a historical technology family. Some selectors were reused for neural voices or redirected to V3.Voice source (opens in a new tab)
Dieterde-DE_DieterVoice
German
Historical voice selector. Earlier concatenative synthesis, retained as a historical technology family. Some selectors were reused for neural voices or redirected to V3.Voice source (opens in a new tab)
Kateen-GB_KateVoice
English United Kingdom
Historical voice selector. Earlier concatenative synthesis, retained as a historical technology family. Some selectors were reused for neural voices or redirected to V3.Voice source (opens in a new tab)
Allisonen-US_AllisonVoice
English United States
Historical voice selector. Earlier concatenative synthesis, retained as a historical technology family. Some selectors were reused for neural voices or redirected to V3.Voice source (opens in a new tab)
Lisaen-US_LisaVoice
English United States
Historical voice selector. Earlier concatenative synthesis, retained as a historical technology family. Some selectors were reused for neural voices or redirected to V3.Voice source (opens in a new tab)
Michaelen-US_MichaelVoice
English United States
Historical voice selector. Earlier concatenative synthesis, retained as a historical technology family. Some selectors were reused for neural voices or redirected to V3.Voice source (opens in a new tab)
Enriquees-ES_EnriqueVoice
Spanish Castilian
Historical voice selector. Earlier concatenative synthesis, retained as a historical technology family. Some selectors were reused for neural voices or redirected to V3.Voice source (opens in a new tab)
Lauraes-ES_LauraVoice
Spanish Castilian
Historical voice selector. Earlier concatenative synthesis, retained as a historical technology family. Some selectors were reused for neural voices or redirected to V3.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.
