Inworld Realtime TTS-2 / TTS-2 Flash
Model idinworld-tts-2
Price$25 per 1M characters
Checked29 September 2026
Where it stands
30newer speech and audio models since its release
- NVIDIA Nemotron 3.5 Transcribe (30B-A4B)28 Oct 2026
- Hy-SimulMT-30B-A3B22 Oct 2026
- Eleven Realtime v1 Max / Mini20 Oct 2026
- Voxtral Mini Transcribe 3 (+ Mini Transcribe Realtime 3)20 Oct 2026
- Voxtral Small Transcribe 320 Oct 2026
The 5 newest are listed. All speech and audio models
- Weights
- Closed weights; access is hosted only.
How to call it
2 ways to use Inworld Realtime TTS-2 / TTS-2 Flash, with the model id each provider expects.
| Provider | Model id | Endpoint | Docs |
|---|---|---|---|
| Inworld API | inworld-tts-2 |
https://api.inworld.ai/tts/v1/voice |
docs.inworld.ai |
| Cloudflare Workers AI | developers.cloudflare.com |
Pricing
| Per 1M characters | $25 |
|---|
As published: “USD per 1M characters PAYG for TTS-2 ($15 for TTS-2 Flash); plan rates down to $12.50/$7, enterprise from $5”.
Source: inworld.ai, checked 29 September 2026.
Specs
- Input
- Text and audio
- Output
- Audio
- Context window
- Not published
- Max output
- Not published
- Open weights
- No
- Licence
- Proprietary
- Released
- 31 August 2026
- Status
- Current
- Type
- Speech and audio
What stands out
What its maker marketed at launch, and what people found later, each with its source.
Closed-loop, audio-aware delivery
Conditions on the actual audio of prior turns (user tone, pacing, emotion), not just transcripts, and takes plain-English voice direction; delivery modes STABLE/BALANCED/CREATIVE.
Cross-lingual identity in 100+ languages
One voice holds identity while switching language on the fly; cloning from 5-15 s reference or voice design from a text description.
Flash variant ~20 ms TTFB
TTS-2 Flash: ~20 ms TTFB, ~5x faster than inworld-tts-2 (docs); TTS-2 median TTFA under 200 ms.
Notes
Research preview 2026-05-05, GA 2026-08-31. Inworld claimed #1 on Artificial Analysis Speech Arena; on 2026-09-29 AA shows it #5 (Elo 1244) behind Eleven v4, Sonic 3.6, Gemini 3.8 Flash TTS, Qwen-Audio-3.0-TTS-Plus. Docs say 200+ languages vs 100+ in blog. TTS-1..1.5 discontinued 2026-06-15 (auto-routed). Max 2,000 chars/request.
Sources: https://inworld.ai/blog/realtime-tts-2 , https://docs.inworld.ai/tts/tts-models , https://inworld.ai/pricing
Not yet checked against an official source: Flash model id not verified.