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Model infoModelsSnapshot: 15 Oct 2026

Gradium / Speech translation pipeline

Gradium S2S Translate

Managed live translation pipeline: stt-translate transcribes and translates input, then the selected TTS model synthesizes the target-language voice. Not a separately established end-to-end checkpoint.

Speech & voice
availableClosed weightsSpeech-to-speechSpeech translation
Official documentation (opens in a new tab)Reviewed 13 Oct 2026
8 of 19 specification fields collected
Context windowNot collectedAwaiting source review
Maximum outputNot collectedAwaiting source review
Input billingSee ratesGradium 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
Input modalities
AudioSource for Input modalities (opens in a new tab)
Output modalities
Audio, TextSource for Output modalities (opens in a new tab)
Reasoning
Not collected
Tool calling
Not collected
Structured output
Not collected
Streaming
SupportedSource for Streaming (opens in a new tab)
Batch processing
Not collected
Fine-tuning
Not collected
Knowledge cutoff
Not collected
Release date
Not collected
Parameters
Not collected
Architecture
Transcribe, translate, then synthesize; separate stt_model_name and tts_model_name selectorsSource for Architecture (opens in a new tab)
Languages
English, French, German, Spanish, PortugueseSource for Languages (opens in a new tab)
Context caching
Not collected
Required request fields
s2s-translate; stt_model_name=stt-translate; tts_model_name=default; target_language plus a matching voice_idSource for Required request fields (opens in a new tab)
Published price
Baseline 30 credits/audio second; advertised limited-launch 50% discount. Expiry not published.Source for Published price (opens in a new tab)
Audio sample rates
Default PCM input 24 kHz; output 48 kHz; signed 16-bit monoSource for Audio sample rates (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.

Gradium API

Provider source (opens in a new tab)
API model ID
s2s-translate
Access
Managed audio-to-audio translation pipeline. Input audio, translated transcript and synthesized output share one duplex WebSocket.
Regions
Default API routes to the nearest cluster without residency commitment. Paid enrolled organizations can pin EU or US inference; account data and custom voices remain in the EU, including for US inference.
API endpoint URL
wss://api.gradium.ai/api/speech/s2sSource for API endpoint URL (opens in a new tab)
Streaming
SupportedSource for Streaming (opens in a new tab)

Prices retain their published currencies and billing units below.

Published billing units · original currency · observed 13 Oct 2026
CategoryUsageRateUnit
Speech usageSpeech translation · XS overage1$3.726audio hour
SubscriptionPlan fee · XS2$13.00month
Speech usageSpeech translation · S overage3$2.70audio hour
SubscriptionPlan fee · S4$43.00month
Speech usageSpeech translation · M overage5$2.16audio hour
SubscriptionPlan fee · M6$340.00month
Speech usageSpeech translation · L overage7$2.052audio hour
SubscriptionPlan fee · L8$1,615.00month

Rate conditions

  1. XS: $13/month includes 225,000 shared credits. Extra usage costs $6.9 per 100,000 credits and must be enabled. Included credits expire at month end; remaining pay-as-you-go credits roll over. Derived overage rate, not the effective rate of included credits. Annual billing and enterprise contracts are separate. Calculated at the advertised limited-launch 50% discount on 30 credits/second, or 15 credits/second. No offer expiry is published; confirm it still applies. Baseline costs twice this amount.
  2. Includes 225,000 credits shared across speech products. Do not add the full subscription to every request. Monthly billing selected; annual pricing is a separate commitment.
  3. S: $43/month includes 900,000 shared credits. Extra usage costs $5 per 100,000 credits and must be enabled. Included credits expire at month end; remaining pay-as-you-go credits roll over. Derived overage rate, not the effective rate of included credits. Annual billing and enterprise contracts are separate. Calculated at the advertised limited-launch 50% discount on 30 credits/second, or 15 credits/second. No offer expiry is published; confirm it still applies. Baseline costs twice this amount.
  4. Includes 900,000 credits shared across speech products. Do not add the full subscription to every request. Monthly billing selected; annual pricing is a separate commitment.
  5. M: $340/month includes 9,000,000 shared credits. Extra usage costs $4 per 100,000 credits and must be enabled. Included credits expire at month end; remaining pay-as-you-go credits roll over. Derived overage rate, not the effective rate of included credits. Annual billing and enterprise contracts are separate. Calculated at the advertised limited-launch 50% discount on 30 credits/second, or 15 credits/second. No offer expiry is published; confirm it still applies. Baseline costs twice this amount.
  6. Includes 9,000,000 credits shared across speech products. Do not add the full subscription to every request. Monthly billing selected; annual pricing is a separate commitment.
  7. L: $1615/month includes 45,000,000 shared credits. Extra usage costs $3.8 per 100,000 credits and must be enabled. Included credits expire at month end; remaining pay-as-you-go credits roll over. Derived overage rate, not the effective rate of included credits. Annual billing and enterprise contracts are separate. Calculated at the advertised limited-launch 50% discount on 30 credits/second, or 15 credits/second. No offer expiry is published; confirm it still applies. Baseline costs twice this amount.
  8. Includes 45,000,000 credits shared across speech products. Do not add the full subscription to every request. Monthly billing selected; annual pricing is a separate commitment.
Pricing source (opens in a new tab)Pricing source (opens in a new tab)

Data & enterprise terms

Paid plans can disable speech-session payload retention in organization Privacy Settings; this is opt-in, not a universal default. Standard ZDR excludes voice-design prompts and clone samples. Enterprise can contract extended coverage. Terms permit improvement/training use unless ZDR is activated; feedback has separate handling.

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.

Gradium API

s2s-translate
Not verified

No reviewed model-specific prompt-cache contract. Reused WebSockets, stored voices and pronunciation dictionaries do not establish discounted prompt caching.

How it works
Not collected

No reviewed model-specific prompt-cache contract. Reused WebSockets, stored voices and pronunciation dictionaries do not establish discounted prompt caching.

Minimum reusable input
Not collected

No reviewed model-specific prompt-cache contract. Reused WebSockets, stored voices and pronunciation dictionaries do not establish discounted prompt caching.

Lifetime & refresh
Not collected

No reviewed model-specific prompt-cache contract. Reused WebSockets, stored voices and pronunciation dictionaries do not establish discounted prompt caching.

How to enable it
Not collected

No reviewed model-specific prompt-cache contract. Reused WebSockets, stored voices and pronunciation dictionaries do not establish discounted prompt caching.

Usage fields
Not collected

No reviewed model-specific prompt-cache contract. Reused WebSockets, stored voices and pronunciation dictionaries do not establish discounted prompt caching.

Billing rules
Not collected

No reviewed model-specific prompt-cache contract. Reused WebSockets, stored voices and pronunciation dictionaries do not establish discounted prompt caching.

Limits & data boundaries
Not collected

No reviewed model-specific prompt-cache contract. Reused WebSockets, stored voices and pronunciation dictionaries do not establish discounted prompt caching.

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 proprietary service license reserves ownership of models and restricts copying, redistribution and extraction. Phonon is supplied as a separately licensed, partner-specific binary; offline deployment is not an open-weight license. Public SDKs and evaluation datasets do not grant production model weights.

Classification evidence (opens in a new tab)

Lifecycle dates

Translation quality update; original launch unverified3 Aug 2026Source (opens in a new tab)

Sources reviewed