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Telnyx speech-to-text (STT) is now available as a standalone, real-time API

17, Dec 2025

We’ve expanded our STT capabilities to make the Telnyx Speech-to-Text API available as a standalone service. So you can transcribe speech in real time, with or without a telephony workflow. With support for over 100 languages, sub-250ms latency, and enterprise-grade infrastructure, Telnyx STT is purpose-built for developers creating high-volume, real-time tools with voice features like AI assistants, real-time dictation workflows and multilingual user experiences.

We also expanded our STT engine options. Alongside existing support for Telnyx Speech-to-Text, Google Speech-to-Text and Deepgram, you can now use Azure Speech-to-Text through the Telnyx Speech-to-Text API, Voice API and Voice AI Agents.

Key benefits

  • One API for multiple transcription engines Access Telnyx, Google, Azure and Deepgram speech recognition through one API. Easily switch between engines based on your needs.
  • 100+ languages and dialects Support global users with built-in transcription for widely used and regional languages from English and Spanish to Hindi and Swahili
  • Live transcription under 250ms Stream audio and get fast, accurate transcripts in real time. Optimized for conversational tools and voice-driven workflows where low latency matters.
  • Secure and compliant by design Enterprise-grade security and flexible data residency, including EU hosting for GDPR compliance.
  • Built for scale A flexible API that supports high-volume, real-time streaming without any minute limitation based on package. Ideal for scaling voice features across any platform.

What’s new

  1. Standalone STT API
  2. Azure Speech-to-Text support via Telnyx Speech-to-Text.
  3. Expanded engine selection, including: Telnyx Speech-to-Text (Whisper), Google Speech-to-Text, Azure Speech-to-Text, Deepgram Nova 2, Deepgram Nova 3 and Deepgram Flux

Why it matters

Voice input is becoming a core part of how people interact with apps whether powering real-time AI agents, delivering live captions, enabling hands-free note-taking, or building voice interfaces into smart devices. The Telnyx STT API gives developers a fast, reliable way to convert live speech into text, across 100+ languages, with low latency, 24/7 support, and effortless scalability.

Getting started

  1. Sign up or log in to your Telnyx Mission Control Portal account.
  2. Generate an API key for STT API using the user icon on the right menu.
  3. Download the Github project
  4. Choose your voice transcription engine:Telnyx, Google, Azure or Deepgram
  5. Stream audio and get real-time transcription in seconds.

Explore the Telnyx developer docs for detailed instructions and learn the pricing.