Inworld Realtime TTS 1.5 Mini API
Ultra-fast, cost-efficient text-to-speech with approximately 120ms latency and 15-language support.
Provider: Inworld | Model ID: inworld-tts-1-5-mini | Context Window: 2K tokens
On this model: 2K tokens context window, speech workload class, routed through Inworld infrastructure.
Pricing
₹3.77/1K characters. Pay-as-you-go micro-metered billing. UPI and cards accepted with zero minimum commitment.
| Billing Unit | Price (INR) |
|---|---|
| speech | ₹3.77/1K characters |
OpenAI-Compatible Integration
Drop into existing OpenAI SDK code by changing the base URL to https://api.luminoai.co.in/v1. The request shape below is the speech synthesis pattern.
curl https://api.luminoai.co.in/v1/chat/completions \
-H "Content-Type: application/json" \
-H "Authorization: Bearer $LUMINO_API_KEY" \
-d '{
"model": "inworld-tts-1-5-mini",
"messages": [
{"role": "system", "content": "You are a helpful assistant."},
{"role": "user", "content": "Read this paragraph in a neutral narrator voice."}
]
}'Why speech cost tracks characters, not time
Speech models bill per character of input text, which maps predictably to finished audio length. Around 800 characters is roughly one minute of speech. Cost is easy to forecast, and the main saving is not regenerating long passages when only a sentence changed.
Good fit for speech synthesis
- Narration for video, courses, and product demos
- Accessibility audio for written content
- Voice replies in support and onboarding flows
- Batch conversion of articles or documentation to audio
Model Specifications
| Model Identifier | inworld-tts-1-5-mini |
|---|---|
| Provider | Inworld |
| Category | speech |
| Context Window | 2K tokens |
| Output Pricing Tier | metered |
| API Protocol | OpenAI-compatible REST API (JSON) |
| Endpoint | https://api.luminoai.co.in/v1/chat/completions |
Inworld Realtime TTS 1.5 Mini API FAQ
How is Inworld Realtime TTS 1.5 Mini priced?
Per character of input text. See the pricing table above for the exact rate and the free allowance.
How many characters is a minute of audio?
Roughly 800 characters per spoken minute, which makes budgeting straightforward from your script length.
Can I use the output commercially?
Yes on paid usage. Confirm the current terms for the specific voice before shipping anything public-facing.
Explore all models in catalog | API Documentation | Test Inworld Realtime TTS 1.5 Mini in Playground