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Release notes

Inworld TTS Now Available on Telnyx

13, Mar 2026

We’re excited to announce that Inworld TTS is now available on Telnyx. With sub-200ms latency, Inworld TTS delivers professional voice actor-quality audio at human-native speeds, enabling truly conversational voice AI experiences at a fraction of traditional TTS costs.

Key Benefits

  • Industry-leading performance with sub-200ms latency: Inworld has earned the #1 quality ranking on Artificial Analysis through blind user testing.
  • Seamless model flexibility and real-time streaming: Choose between TTS-1.5 Max for premium quality or TTS-1.5 Mini for speed optimization, with native-speaker quality across 15 languages including English, Spanish, French, Korean, Chinese, Hindi, Japanese, and German.
  • Enterprise-grade deployment and dramatic cost savings: On-premise deployment options ensure data sovereignty while pricing as low as $5 to $10 per million characters, which is up to 90% less than traditional TTS providers.

Why It Matters

Inworld's breakthrough in cost efficiency removes the economic barriers that have limited voice AI adoption. This integration exemplifies Telnyx's mandate to serve as the comprehensive hub for all voice AI technologies, bringing enterprises breakthrough models from leading providers for future-proofing, global scale, and cost optimization. Our unified platform means you can harness Inworld's innovations alongside our other TTS, STT, and LLM offerings without rebuilding applications, letting you focus on creating exceptional voice experiences that scale cost-effectively.

Getting Started

Via Voice API / Standalone TTS

  1. Log in to your Telnyx Mission Control Portal account.
  2. Generate an API key for the TTS API.
  3. Navigate to Real-time communication → Voice → Settings → TTS Playground.
  4. Choose Inworld as your voice vendor and select TTS-1.5 Max or TTS-1.5 Mini as your TTS model.
  5. Send text to synthesize and receive an audio stream or file in real time.

Via AI Agents

  1. Navigate to the AI Assistants section.
  2. Select Inworld as your voice vendor in the voice playground and choose TTS-1.5 Max or TTS-1.5 Mini as your TTS model to test.
  3. Build your AI agent with the selected voice in minutes.
  4. Read our developer docs for Voice API TTS and Standalone TTS to learn more and see our pricing.