Models
Learn about latest Text-to-Speech models, changelog, and deprecations.
Soniox Text-to-Speech is built for the hardest parts of speech generation. It delivers native-speaker-quality speech in 60+ languages, with hallucination-free output and accurate pronunciation of alphanumerics such as phone numbers, email addresses, and IDs.
This page lists the currently available models, along with release notes and important updates.
Current models
Model | Type | Status |
|---|---|---|
| tts-rt-v2 | Real-time | Active |
| tts-rt-v1 | Real-time | Deprecated Will be removed Aug 31, 2026 |
Aliases
Aliases provide a stable reference so you don’t need to change your code when newer versions are released.
| Alias | Points to | Notes |
|---|---|---|
| tts-rt-v1-preview | tts-rt-v1 |
Changelog
Aug 11, 2026
Overview
Soniox TTS v2 is now generally available.
tts-rt-v2is available to all API customers and deployed in all Soniox regions: US, EU, and JP.
Key improvements
- Natural, expressive speech across more than 60 languages
- Direct control over emotion, delivery, and vocal reactions through audio tags
- High-fidelity voice cloning
- Natural language switching within the same sentence
- Even more precise pronunciation of names, terminology, numbers, codes, addresses, and identifiers
- Reduced silence between sentences and punctuation for more responsive conversations
API compatibility
The tts-rt-v2 model is fully compatible with the existing tts-rt-v1 model and Soniox Text-to-Speech API.
To upgrade, simply replace the model name in your API request: { "model": "tts-rt-v2" }
Deprecation notice
The tts-rt-v1 model will be removed on August 31, 2026.
After August 31, 2026, requests using tts-rt-v1 will automatically route to tts-rt-v2 with no service interruption and no API changes required.
April 29, 2026
Overview
Soniox TTS is now generally available.
- The preview model
tts-rt-v1-previewis now available as the production modeltts-rt-v1. tts-rt-v1is available to all API customers and deployed in all Soniox regions: US, EU, and JP.- For backward compatibility,
tts-rt-v1-previewnow points totts-rt-v1with no service interruption. We recommend updating your API requests to usetts-rt-v1.
April 23, 2026
Overview
tts-rt-v1-preview is the first Soniox Text-to-Speech model, released in preview to gather developer feedback and guide further improvements before general availability.
Key capabilities
- Native-speaker-quality speech in 60+ languages
- Hallucination-free generation, with no invented words, dropped content, or unexpected substitutions
- Accurate rendering of alphanumerics such as email addresses, phone numbers, street addresses, IDs, and codes
- Streaming generation before the sentence ends for ultra-low-latency voice systems
- Multiple voices that work across all supported languages
- Configurable audio formats, sample rates, and bitrates
- Support for both WebSocket and REST APIs