AssemblyAI STT Now Available via API and Mission Control

AssemblyAI Universal-Streaming is now available as a speech-to-text option through the Telnyx STT API and Mission Control, adding low-latency transcription with built-in turn detection for voice agents.

What's New

• AssemblyAI STT via API: The assemblyai/universal-streaming model is now available for real-time speech-to-text transcription through the STT API, with built-in end-of-turn detection for voice agent workflows.
• AssemblyAI STT in Mission Control: Select AssemblyAI as a transcription model when configuring Voice AI Assistants in Mission Control.

How It Works

AssemblyAI STT uses the model ID assemblyai/universal-streaming for real-time transcription with low latency and automatic turn detection, so your voice agent knows when the caller has finished speaking.

Supported languages: English, Spanish, German, French, Portuguese, and Italian.

Why It Matters

Developers building voice agents now have another low-latency STT option alongside Deepgram Flux, with AssemblyAI's Universal-Streaming model providing turn detection out of the box. This gives more flexibility to choose the STT engine that fits your accuracy, language, and latency requirements.

Getting Started

Via the API:

• STT: Set model to assemblyai/universal-streaming in your STT API or WebSocket requests. See the transcription settings documentation for model details.

In Mission Control:

1. Go to AI Assistants and choose an assistant to edit
2. In the Transcription tab, select assemblyai/universal-streaming from the Transcription Model dropdown
3. Save your assistant