Inworld TTS-1.5-Mini overview
Inworld TTS-1.5-Mini by Inworld AI
It delivers high-quality speech synthesis with minimal delay, supporting instant voice cloning across 15 languages.
Inworld TTS-1.5-Mini specs
- Model ID
inworld/tts-1-5-mini- Developer
- Inworld AI
- Input
- Text
- Output
- Audio
- Endpoint
POST https://api.aimlapi.com/v1/tts
High‑quality, expressive speech
Despite its compact footprint, TTS‑1.5‑Mini API delivers high‑quality, expressive speech suitable for core customer‑facing interactions and immersive experiences. It supports adjustable speaking rate and naturally flowing prosody, giving developers control over rhythm and pacing without sacrificing smoothness.
Multilingual support and voice cloning
TTS‑1.5‑Mini covers the same 15 languages as TTS‑1.5‑Max, simplifying global rollout with a single, optimized low‑latency model. It also supports instant voice cloning, allowing teams to create and reuse recognizable persona voices from short reference clips over most supported languages.
- Ultra-low latency (~120ms P50/P90) for instant responses.
- Supports 15 languages including English, Chinese, Japanese, Korean, Russian, Italian, Spanish, Portuguese, French, German, Polish, Dutch, Hindi, Hebrew, and Arabic.
- High-quality instant voice cloning and professional options.
- Audio markups for emotion, style, and non-verbals.
- Multilingual text-to-speech with custom pronunciation support.
Performance Benchmarks
Inworld TTS-1.5-Mini excels in speed tests, hitting under 120ms P90 latency, making it 4x faster than prior generations for production workloads. It ranks #1 in quality among efficient models while maintaining top stability for high-volume use.
Ideal Use Cases
Deploy TTS-1.5-Mini in scenarios demanding rapid audio generation, such as interactive chatbots, virtual assistants, and game dialogue systems. It's perfect for high-volume production, prototyping voiceovers, content accessibility tools, and multilingual apps where budget and speed matter most.
- Real-time gaming and ultra-responsive voice agents.
- Scalable chatbots with voice output.
- Affordable audio for apps and accessibility features.
Use cases
Inworld TTS 1.5 Mini is documented for conversational AI agents, where low latency helps voice assistants respond naturally without awkward pauses. It is also documented for real-time translation and dubbing, where speech synthesis needs to keep pace with live speakers. Another stated use case is interactive entertainment, including AI companions and narrative experiences that require expressive, real-time character speech. It is also documented for accessibility applications such as screen readers, navigation aids, and assistive technologies.
Inworld TTS-1.5-Mini API pricing
| Usage | Price | Unit |
|---|---|---|
| Speech generation | $5.25 | per generation |
Prices from the AI/ML API price list, checked on Nov 4, 2026.
Inworld TTS-1.5-Mini vs other speech models: prices
AI/ML API rates for 5 models, per generation.
| Model | Per generation |
|---|---|
 Inworld TTS-1.5-Mini | $5.25 |
| Inworld TTS-1 | $0.007 |
| Inworld TTS-1-Max | $0.013 |
 Eleven v3 Alpha | $0.234 |
| Inworld TTS-1.5-Max | $10.5 |
How to use the Inworld TTS-1.5-Mini 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-1-5-mini",
"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-1-5-mini",
"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-1-5-mini",
"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-1.5-Mini
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Inworld TTS-1.5-Mini FAQ
What inputs and outputs does Inworld TTS-1.5-Mini support?
Inworld TTS-1.5-Mini takes text as input and returns audio.
How much does Inworld TTS-1.5-Mini cost?
Inworld TTS-1.5-Mini is priced at $5.25 / 1M tokens.
How is Inworld TTS-1.5-Mini billed?
Inworld TTS-1.5-Mini is billed per generation, a fixed charge per output rather than by prompt length.
Who created Inworld TTS-1.5-Mini?
Inworld TTS-1.5-Mini was built by Inworld AI.
How do I call Inworld TTS-1.5-Mini on AI/ML API?
Send a request to https://api.aimlapi.com/v1/tts with inworld/tts-1-5-mini as the model id.
Is Inworld TTS-1.5-Mini available through a single API key?
Yes. Inworld TTS-1.5-Mini is served through AI/ML API, so the same key and endpoint format used for other models applies.
What is the model identifier used for Inworld TTS-1.5-Mini?
Its model ID is inworld/tts-1-5-mini.
What is Inworld TTS-1.5-Mini designed for?
It is a text-to-speech model optimized for low-latency, real-time and high-throughput use while maintaining high audio quality.