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Speech To Text Capabilities

List supported STT providers

Retrieve the canonical list of supported speech-to-text providers, models, accepted language codes, and the service types each model supports.

Service types:

  • streaming — standalone WebSocket transcription via /speech-to-text/transcription.
  • file_based — file-based transcription via /ai/audio/transcriptions.
  • in_call — live call transcription via Call Control transcription_start.
  • ai_assistant — STT configured on a Call Control AI Assistant via voice-assistant TranscriptionConfig (covers both live-streaming and non-streaming/batch models).

Use this endpoint to discover which (provider, model) combinations are available for the surface you need, and which language codes each accepts. auto in a languages array indicates the provider performs language detection.

get/speech-to-text/providers

Query parameters

service_type'streaming' | 'file_based' | 'in_call' | 'ai_assistant'

Service surface a model is available on. ai_assistant is the STT surface configured via Call Control voice-assistant transcription; it covers both live-streaming and non-streaming/batch models (matching the TranscriptionConfig.model enum on call-control voice assistants).

Filter to entries that support the given service type. For backward compatibility with the values that briefly shipped before the product-aligned rename, the legacy aliases file_transcription, in_call_transcription, and ai_assistant_transcription are silently accepted and normalized to file_based, in_call, and ai_assistant respectively. The response always emits the canonical (post-rename) values.

provider'deepgram' | 'speechmatics' | 'assemblyai' | 'xai' | 'soniox' | 'parakeet' | 'humain' | 'reson8' | 'azure' | 'openai' | 'google' | 'telnyx'

Filter to entries for a specific STT provider. The enum mirrors the providers advertised across the speech-to-text spec (including google and telnyx, which are accepted as WebSocket transcription engines). A provider that has no models currently registered for any service type will return an empty data array rather than an error.

Response

List of supported STT providers and models.

Example response

{
  "data": [
    {
      "model": "deepgram/nova-3",
      "provider": "deepgram",
      "service_types": [
        {
          "languages": [
            "en",
            "es",
            "fr"
          ]
        }
      ]
    }
  ],
  "meta": {
    "total": 12
  }
}

Changes

Changed in 5 of the 61 revisions of this API.14

  • 1571b0380bd71See the full diff
    • ○

      added the required property // to the response with the status

      response-required-property-added

    This revision also has 64 changes that name no endpoint, such as unreferenced schemas being removed. See the revision's changelog

  • 924fbdb1e5a11See the full diff
    • ○

      added the new enum value reson8 to the query request parameter provider

      request-parameter-enum-value-added

  • ce9e90fc16f31See the full diff
    • ○

      added the new enum value humain to the query request parameter provider

      request-parameter-enum-value-added

  • 80dbfc37f51e1See the full diff
    • ○

      added the new enum value parakeet to the query request parameter provider

      request-parameter-enum-value-added

  • 224ed0d8a5c31See the full diff
    • ▲

      removed the enum value parakeet from the query request parameter provider

      request-parameter-enum-value-removed

    This revision also has 111 changes that name no endpoint, such as unreferenced schemas being removed. See the revision's changelog