Voice Agent API: flux-general-multi does not respect language_hints and defaults to English transcription

[HakanHigh5]

Hi Deepgram Community,

We are building a production Voice Agent and want to use flux-general-multi as the STT/listen provider. However, we are not able to get German transcription working correctly with Flux Multilingual in the Voice Agent setup.

When we use language_hints, the Settings message is accepted, but transcription appears to default to English instead of German.

Listen provider payload:

{
  "type": "deepgram",
  "model": "flux-general-multi",
  "version": "v2",
  "language_hints": ["de"],
  "eot_threshold": 0.65,
  "eager_eot_threshold": 0.35,
}

This does not produce an API parsing error, but the transcription still behaves as if English is being used.

We also tested multiple language_hints values:

"language_hints": ["de"]
"language_hints": ["en", "de"]

Both are accepted by the API, but German transcription is still not working as expected.

When we try language_hint instead of language_hints, the API rejects the Settings message:

{
  "type": "deepgram",
  "model": "flux-general-multi",
  "version": "v2",
  "language_hint": "de"
}

Error returned:

{
  "type": "Error",
  "description": "Error parsing client message. Check the agent.listen.provider field against the API spec.",
  "code": "UNPARSABLE_CLIENT_MESSAGE"
}

For comparison, the following listen provider works correctly in the same Voice Agent setup and produces German transcription:

{
  "type": "deepgram",
  "model": "nova-3",
  "language": "de"
}

So the issue appears specific to flux-general-multi language handling in Voice Agent.

Additional info:

• endpoint: wss://api.eu.deepgram.com/v1/agent/converse
• field mentioned in error: agent.listen.provider

Has anyone else run into this issue with flux-general-multi in Voice Agent accepting language_hints but still defaulting to English transcription? If so, how did you resolve it — or am I missing something in the expected payload/configuration?

This is currently blocking us from testing Flux Multilingual in our production Voice Agent pipeline.

Thank you.

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• The programming language you are working in (e.g. JavaScript, Python).
• A request ID that triggered your error or issue.

[HakanHigh5]

• Python
• Request ID: 019e471b-8240-7680-9bb1-27365f633441
• Request ID: 019e50cb-103d-7be0-99f3-581045ebb62a