STT Models

The Voice Agent API uses Deepgram speech-to-text. Two model families are supported, and the agent picks the right STT endpoint based on the version field of agent.listen.provider — you do not manage endpoint URLs yourself.

• Flux for conversational voice agents that need model-integrated end-of-turn detection and ultra-low latency.
• Nova for conventional streaming transcription with the broadest feature set: smart formatting, language detection, multilingual code-switching, custom keyterms.

Choosing a model family

For a deeper comparison see Flux vs Nova-3.

Flux

Flux delivers first-of-its-kind model-integrated end-of-turn detection, configurable turn-taking dynamics, and ultra-low latency optimized for voice agent pipelines. See Flux Feature Overview for details.

Example

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{
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  "agent": {
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    "listen": {
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      "provider": {
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        "type": "deepgram",
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        "version": "v2",
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        "model": "flux-general-en",
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        "keyterms": ["Deepgram", "Aura"]
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      }
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    }
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  }
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}

Multilingual example

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{
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  "agent": {
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    "listen": {
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      "provider": {
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        "type": "deepgram",
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        "version": "v2",
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        "model": "flux-general-multi",
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        "language_hints": ["en", "es"]
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      }
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    }
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  }
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}

For multilingual prompting strategies and examples see Flux Language Prompting.

Nova

For the full list of Nova models and supported languages see Models & Languages Overview.

Example

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{
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  "agent": {
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    "listen": {
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      "provider": {
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        "type": "deepgram",
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        "model": "nova-3",
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        "language": "en-US",
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        "smart_format": true,
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        "keyterms": ["Deepgram", "Aura"]
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      }
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    }
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  }
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}

What’s Next

• Configure the Voice Agent
• Multilingual Voice Agents
• Models & Languages Overview