TTS
TTS models
Choose an Inworld TTS model based on your use case, quality needs, and performance requirements.
Realtime TTS-2
Our flagship, top-ranked model — the best choice for production
- Best quality and steerability, with natural language steering for speech that fits its context
- Support for 200+ languages and locales
- Ultra-low latency (100 ms TTFB*) at high concurrency
- High quality instant voice cloning
- Enhanced timestamps with phonetic details and visemes
* P90 time to first audio byte, measured server-side — excludes network latency.
Models overview
| Name | Model ID | Description | Supported languages |
|---|---|---|---|
| Realtime TTS-2 | inworld-tts-2 | Our most powerful model with natural language steering and the strongest multilingual capabilities — the best choice for production quality | 200+ languages and locales — see Languages |
| Realtime TTS-2 Flash | inworld-tts-2-flash | Our fastest, most cost-efficient model — significantly lower latency than inworld-tts-2, ideal for real-time agents and high-volume workloads | 200+ languages and locales — see Languages |
Using an earlier model? Previous-generation models (inworld-tts-1, inworld-tts-1-max, inworld-tts-1.5-max, inworld-tts-1.5-mini) are deprecated and not recommended for new projects. inworld-tts-1 and inworld-tts-1-max were discontinued on June 15, 2026. Requests to those two models are automatically routed to newer models. If you still use any of these earlier models, we recommend the TTS-2 family for better quality, latency, and cost.
Feature comparison
| Feature | Realtime TTS-2 | Realtime TTS-2 Flash |
|---|---|---|
| Best for | Production workloads that need the best quality and steerability | Latency-critical, high-volume, and cost-sensitive workloads |
| Quality | Top-ranked flagship — best quality and steerability | High quality at the lowest latency and cost |
| Latency (TTFB) * | 100 ms | 20 ms |
| Instant voice cloning | ||
| Professional voice cloning Beta | ||
| Inline pronunciation | ||
| Multilingual | 200+ languages | 200+ languages |
| Steering | ||
| Pause controls | ||
| Timestamp alignment | ||
| Zero data retention |
* P90 time to first audio byte, measured server-side — excludes network latency.