TTS 1.5 APIs

About TTS 1.5 APIs

TTS 1.5 on EmpirioLabs brings together 2 audio generation model APIs from Inworld, including TTS 1.5 Mini, TTS 1.5 Max. Each model keeps its own dedicated page with live pricing, parameters, docs, and playground access.

Use the same EmpirioLabs API key and endpoint pattern across the family, then switch behavior by changing the model id in your request.

TTS 1.5 models (2)

TTS 1.5 Mini

Sub-130ms TTFB voice synthesis with 271+ voices across 15 languages, expressive prosody, and real-time SSE streaming for low-latency voice agents.

TTS 1.5 Max

Broadcast-quality voice synthesis with rich expressive prosody, 271+ voices across 15 languages, and real-time SSE streaming with per-word timestamps.

TTS 1.5 API pricing

Compare the family at a glance, then open a model page for the complete live rate card and parameters.

How to call TTS 1.5 models

TTS 1.5 Mini serves speech through POST /v1/audio/speech and returns playable audio. Send the text to speak as input with the model id tts-1-5-mini. For this family, swap the model value for any supported id: tts-1-5-mini tts-1-5-max. Get an API key from the EmpirioLabs dashboard.

curl https://api.empiriolabs.ai/v1/audio/speech \
  -H "Authorization: Bearer $EMPIRIOLABS_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "tts-1-5-mini",
    "input": "Welcome to EmpirioLabs. Your build just finished."
  }' \
  --output speech.mp3

TTS 1.5 APIs: common questions

What is the TTS 1.5 API?

TTS 1.5 on EmpirioLabs is a family of 2 Audio Generation model APIs from Inworld: TTS 1.5 Mini, TTS 1.5 Max. You use one EmpirioLabs API key and choose the model id that fits the request.

Which TTS 1.5 model should I use?

Start with the model whose dedicated page matches your speed, quality, and pricing needs, then test it in the EmpirioLabs playground. The comparison cards above link to each model's live rate card and quickstart.

Can I switch between TTS 1.5 models without rebuilding my integration?

Yes. The family is designed around the same EmpirioLabs API pattern, so most integrations switch by changing the model value. Check the model page before shipping if you rely on a model-specific parameter.

How is TTS 1.5 pricing shown?

Pricing is pay as you go. The cards on this page show a short live-catalog summary, and each model page shows the complete rate card that matches API billing.

Can I try TTS 1.5 in the browser?

Yes. Open any model page in this family and use its playground link to test prompts and parameters in the browser before integrating the API.