Documentation Index
Fetch the complete documentation index at: /llms.txt
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Available speech-to-text engines and models on Telnyx — Deepgram, Telnyx native, Google, Azure, xAI, AssemblyAI, Speechmatics, Soniox, Parakeet — selectable via query parameters.
transcription_engine and model query parameters.
| Engine | Default model | Other models | Notes |
|---|---|---|---|
| Deepgram | nova-3 | nova-2, flux, flux-multi | Default engine. Broadest format support. |
| Telnyx | openai/whisper-tiny | — | On-network, lightweight |
latest_long | — | Multilingual, long-form | |
| Azure | azure/fast | — | Broad language/accent coverage |
| xAI | xai/grok-stt | — | Grok STT for real-time transcription |
| AssemblyAI | assemblyai/universal-streaming | — | Universal-Streaming (backed by Universal-3.5 Pro Realtime) for low-latency voice agents |
| Speechmatics | speechmatics/standard | — | High-accuracy real-time transcription with multilingual and bilingual packs |
| Soniox | soniox/stt-rt-v4 | — | Real-time transcription with automatic language detection |
| Parakeet | nvidia/parakeet-v3 | — | Self-hosted multilingual transcription with automatic language detection. Final results only. |
flux is English-only; flux-multi adds code-switching across English, Spanish, French, German, Hindi, Russian, Portuguese, Japanese, Italian, and Dutch (plus auto). See Audio Formats for supported formats.Was this page helpful?