Inworld TTS-1 overview
Inworld TTS-1 by Inworld AI
A next-generation neural text-to-speech (TTS) model developed by Inworld AI, engineered specifically for dynamic voice applications.
Inworld TTS-1 specs
- Model ID
inworld/tts-1- Developer
- Inworld AI
- Input
- Text
- Output
- Audio
- Endpoint
POST https://api.aimlapi.com/v1/tts
Inworld TTS-1 API Overview
Inworld TTS-1 is a state-of-the-art Transformer-based autoregressive text-to-speech (TTS) model designed for high-quality, real-time speech synthesis across multiple languages. It offers low latency audio generation at high resolution (48 kHz), supports fine-grained emotional control, and is optimized for both on-device and cloud applications.
Technical Specifications
- Architecture: Transformer-based autoregressive model
- Sample rate: Up to 48 kHz high-resolution audio
- Latency: Low-latency synthesis suitable for real-time applications
- Languages supported: 11 languages with multilingual capabilities
- Emotion control: Fine-grained emotional expressiveness
Performance Benchmarks
The model outperforms many competitive models in terms of multilingual speech quality, emotional control, and latency.
Key Features
- Supports high-fidelity 48 kHz speech generation with super-resolution techniques for audio clarity
- Fine-grained emotional and prosodic control allowing nuanced speech output
- Multilingual support with consistent quality across 11 languages
- Efficient architecture optimized for both cloud and edge deployments
- Large training dataset comprising over 300,000 hours of English and Chinese speech data enhancing naturalness and robustness
Comparison with Other Models
vs Google WaveNet: Inworld TTS-1 offers lower latency and better real-time synthesis capabilities, making it ideal for interactive applications, whereas WaveNet provides highly natural and expressive speech but with higher computational cost.
vs 11LABS Multilingual V2: Inworld TTS-1 provides finer emotional nuance and lower latency for live interaction use cases, whereas 11LABS offers strong multilingual capabilities with a simpler interface. 11LABS is favored for ease of use, while Inworld TTS-1 is preferred for premium, expressive output.
vs OpenAI TTS-1-HD: OpenAI TTS-1-HD produces ultra-high-definition audio with studio-quality fidelity, surpassing Inworld in audio richness but at the expense of higher latency and cost. Inworld TTS-1 is more cost-efficient and versatile for multilingual and device-flexible deployments, making it suited for everyday real-time needs.
Use cases
- Real-time voice assistants and conversational AI requiring natural, low-latency speech
- Multimedia content creation, including audiobooks, podcasts, and video narration in multiple languages
- Interactive voice response (IVR) systems with emotional nuance for better user engagement
- On-device TTS applications for mobile and embedded systems with limited resources
- High-quality multilingual speech synthesis for educational and accessibility tools
Inworld TTS-1 API pricing
| Usage | Price | Unit |
|---|---|---|
| Speech generation | $0.007 | per generation |
Prices from the AI/ML API price list, checked on Nov 4, 2026.
Inworld TTS-1 vs other speech models: prices
AI/ML API rates for 5 models, per generation.
| Model | Per generation |
|---|---|
 Inworld TTS-1 | $0.007 |
| Inworld TTS-1-Max | $0.013 |
 Qwen3 TTS Flash | $0.013 |
| Inworld TTS-1.5-Mini | $5.25 |
| Inworld TTS-1.5-Max | $10.5 |
How to use the Inworld TTS-1 API
View docs
Build with your agent
Give your agent the model details, code and documentation.
1Get your API key
Create API keyexport AIMLAPI_KEY="8f2b4c7d9a1e6b3f…"2Make your first request
curl 'https://api.aimlapi.com/v1/tts' \
-H "Authorization: Bearer $AIMLAPI_KEY" \
-H 'Content-Type: application/json' \
-d '{
"model": "inworld/tts-1",
"text": "Your order has shipped. It will arrive on Thursday between nine and eleven in the morning. Reply to this message if you need to change the delivery time."
}'import os
import requests
headers = {
"Authorization": f"Bearer {os.environ['AIMLAPI_KEY']}",
"Content-Type": "application/json",
}
payload = {
"model": "inworld/tts-1",
"text": "Your order has shipped. It will arrive on Thursday between nine and eleven in the morning. Reply to this message if you need to change the delivery time."
}
response = requests.post("https://api.aimlapi.com/v1/tts", headers=headers, json=payload, timeout=120)
response.raise_for_status()
print(response.json())const response = await fetch("https://api.aimlapi.com/v1/tts", {
method: "POST",
headers: {
Authorization: `Bearer ${process.env.AIMLAPI_KEY}`,
"Content-Type": "application/json",
},
body: JSON.stringify({
"model": "inworld/tts-1",
"text": "Your order has shipped. It will arrive on Thursday between nine and eleven in the morning. Reply to this message if you need to change the delivery time."
}),
});
if (!response.ok) throw new Error(`HTTP ${response.status}`);
console.log(await response.json());Models similar to Inworld TTS-1
Related articles
-1%20(1).webp)
Inworld TTS-1 FAQ
What inputs and outputs does Inworld TTS-1 support?
Inworld TTS-1 takes text as input and returns audio.
How much does Inworld TTS-1 cost?
Inworld TTS-1 is priced at $0.007 / 1M tokens.
How is Inworld TTS-1 billed?
Inworld TTS-1 is billed per generation, a fixed charge per output rather than by prompt length.
Who created Inworld TTS-1?
Inworld TTS-1 was built by Inworld AI.
How do I call Inworld TTS-1 on AI/ML API?
Send a request to https://api.aimlapi.com/v1/tts with inworld/tts-1 as the model id.
Is Inworld TTS-1 available through a single API key?
Yes. Inworld TTS-1 is served through AI/ML API, so the same key and endpoint format used for other models applies.
What is the Inworld TTS-1 model ID?
Use inworld/tts-1 as the model parameter. Requests go to https://api.aimlapi.com/v1/tts with your AI/ML API key.