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We recommend using Sonic 3 for best results, most languages, and controllability. We continue to serve these older models for compatibility.
All models have a base model name (e.g. sonic-2, sonic-turbo) and date-versioned model names (e.g. sonic-2-2025-06-11). We recommend using base model names for prototyping and development, then switching to a date-versioned model for production use cases to ensure stability. When making API calls, you can specify either: 
// Use the base model (automatically routes to the latest snapshot)
const modelId = "sonic-3";

// Or specify a particular snapshot for consistency
const modelId = "sonic-3-2025-10-27";

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sonic-2

Sonic-2 provides ultra-realistic speech with accurate transcript following, minimal hallucinations, and excellent voice cloning. It’s latency optimized and achieves 90ms model latency. Additional Capabilities:
  • Higher fidelity voice cloning
  • Timestamps for all 15 languages
  • Infill support
SnapshotRelease DateLanguagesStatus
sonic-2-2025-06-11June 11, 2025en, fr, de, es, pt, zh, ja, hi, it, ko, nl, pl, ru, sv, trStable
sonic-2-2025-05-08May 8, 2025en, fr, de, es, pt, zh, ja, hi, it, ko, nl, pl, ru, sv, trStable
sonic-2-2025-04-16April 16, 2025en, fr, de, es, pt, zh, ja, hi, it, ko, nl, pl, ru, sv, trStable
sonic-2-2025-03-07March 7, 2025en, fr, de, es, pt, zh, ja, hi, it, ko, nl, pl, ru, sv, trStable
the latest stable snapshot of the model Note: For versions after sonic-2-2025-03-07, _experimental_controls is not supported. If the latest model does not meet your needs, and you would like to use the controls, please make requests to sonic-2-2025-03-07. To get started with Sonic-2, see Make an API request. Read these pages to learn more about how to use Sonic-2:

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sonic-turbo

All the power of Sonic, with half the latency (as low as 40ms).
SnapshotRelease DateLanguagesStatus
sonic-turbo-2025-03-07March 7, 2025en, fr, de, es, pt, zh, ja, hi, it, ko, nl, pl, ru, sv, trStable

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sonic

The first version of our flagship text-to-speech model. It produces high-accuracy, expressive speech, and is optimized for efficiency to achieve low latency.
SnapshotRelease DateLanguagesStatus
sonic-2024-12-12December 12, 2024en, fr, de, es, pt, zh, ja, hi, it, ko, nl, pl, ru, sv, trStable
sonic-2024-10-19October 19, 2024en, fr, de, es, pt, zh, ja, hi, it, ko, nl, pl, ru, sv, tr
the latest stable snapshot of the model

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Sonic-2 Language Support

  1. English (en)
  2. French (fr)
  3. German (de)
  4. Spanish (es)
  5. Portuguese (pt)
  6. Chinese (zh)
  7. Japanese (ja)
  8. Hindi (hi)
  9. Italian (it)
  10. Korean (ko)
  11. Dutch (nl)
  12. Polish (pl)
  13. Russian (ru)
  14. Swedish (sv)
  15. Turkish (tr)

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Deprecated and Preview Model Aliases

The following model aliases are now deprecated. Please use the recommended model names instead:
Deprecated AliasUse Instead
sonic-previewsonic-2
sonic-englishsonic-2024-10-19
sonic-multilingualsonic-2024-10-19
We recommend updating your integrations to use the current model names for the best performance and support.