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

JavaScript

import Telnyx from 'telnyx';

const client = new Telnyx({
  apiKey: process.env['TELNYX_API_KEY'], // This is the default and can be omitted
});

const response = await client.speechToText.listProviders();

console.log(response.data);

import os
from telnyx import Telnyx

client = Telnyx(
    api_key=os.environ.get("TELNYX_API_KEY"),  # This is the default and can be omitted
)
response = client.speech_to_text.list_providers()
print(response.data)

package main

import (
	"context"
	"fmt"

	"github.com/team-telnyx/telnyx-go"
	"github.com/team-telnyx/telnyx-go/option"
)

func main() {
	client := telnyx.NewClient(
		option.WithAPIKey("My API Key"),
	)
	response, err := client.SpeechToText.ListProviders(context.TODO(), telnyx.SpeechToTextListProvidersParams{})
	if err != nil {
		panic(err.Error())
	}
	fmt.Printf("%+v\n", response.Data)
}

package com.telnyx.sdk.example;

import com.telnyx.sdk.client.TelnyxClient;
import com.telnyx.sdk.client.okhttp.TelnyxOkHttpClient;
import com.telnyx.sdk.models.speechtotext.SpeechToTextListProvidersParams;
import com.telnyx.sdk.models.speechtotext.SpeechToTextListProvidersResponse;

public final class Main {
    private Main() {}

    public static void main(String[] args) {
        TelnyxClient client = TelnyxOkHttpClient.fromEnv();

        SpeechToTextListProvidersResponse response = client.speechToText().listProviders();
    }
}

<?php

require_once dirname(__DIR__) . '/vendor/autoload.php';

use Telnyx\Client;
use Telnyx\Core\Exceptions\APIException;

$client = new Client(apiKey: getenv('TELNYX_API_KEY') ?: 'My API Key');

try {
  $response = $client->speechToText->listProviders(
    provider: 'deepgram', serviceType: 'streaming'
  );

  var_dump($response);
} catch (APIException $e) {
  echo $e->getMessage();
}

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

{
  "errors": [
    {
      "code": "10015",
      "title": "Bad Request",
      "detail": "The request failed because it was not well-formed."
    }
  ]
}

{
  "errors": [
    {
      "code": "10004",
      "title": "Missing required parameter",
      "detail": "The 'transcription_engine' parameter is required and cannot be blank.",
      "source": {
        "pointer": "/transcription_engine"
      }
    }
  ]
}

Authorizations

Authorization

string

header

required

Bearer authentication header of the form Bearer <token>, where <token> is your auth token.

Query Parameters

service_type

enum<string>

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. 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).

Available options:

streaming,

file_based,

in_call,

ai_assistant

provider

enum<string>

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.

Available options:

deepgram,

speechmatics,

assemblyai,

xai,

soniox,

parakeet,

humain,

reson8,

azure,

openai,

google,

telnyx

Response

List of supported STT providers and models.

data

object[]

required

Show child attributes

meta

object

required

Show child attributes

⌘I

JavaScript

import Telnyx from 'telnyx';

const client = new Telnyx({
  apiKey: process.env['TELNYX_API_KEY'], // This is the default and can be omitted
});

const response = await client.speechToText.listProviders();

console.log(response.data);

import os
from telnyx import Telnyx

client = Telnyx(
    api_key=os.environ.get("TELNYX_API_KEY"),  # This is the default and can be omitted
)
response = client.speech_to_text.list_providers()
print(response.data)

package main

import (
	"context"
	"fmt"

	"github.com/team-telnyx/telnyx-go"
	"github.com/team-telnyx/telnyx-go/option"
)

func main() {
	client := telnyx.NewClient(
		option.WithAPIKey("My API Key"),
	)
	response, err := client.SpeechToText.ListProviders(context.TODO(), telnyx.SpeechToTextListProvidersParams{})
	if err != nil {
		panic(err.Error())
	}
	fmt.Printf("%+v\n", response.Data)
}

package com.telnyx.sdk.example;

import com.telnyx.sdk.client.TelnyxClient;
import com.telnyx.sdk.client.okhttp.TelnyxOkHttpClient;
import com.telnyx.sdk.models.speechtotext.SpeechToTextListProvidersParams;
import com.telnyx.sdk.models.speechtotext.SpeechToTextListProvidersResponse;

public final class Main {
    private Main() {}

    public static void main(String[] args) {
        TelnyxClient client = TelnyxOkHttpClient.fromEnv();

        SpeechToTextListProvidersResponse response = client.speechToText().listProviders();
    }
}

<?php

require_once dirname(__DIR__) . '/vendor/autoload.php';

use Telnyx\Client;
use Telnyx\Core\Exceptions\APIException;

$client = new Client(apiKey: getenv('TELNYX_API_KEY') ?: 'My API Key');

try {
  $response = $client->speechToText->listProviders(
    provider: 'deepgram', serviceType: 'streaming'
  );

  var_dump($response);
} catch (APIException $e) {
  echo $e->getMessage();
}

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

{
  "errors": [
    {
      "code": "10015",
      "title": "Bad Request",
      "detail": "The request failed because it was not well-formed."
    }
  ]
}

{
  "errors": [
    {
      "code": "10004",
      "title": "Missing required parameter",
      "detail": "The 'transcription_engine' parameter is required and cannot be blank.",
      "source": {
        "pointer": "/transcription_engine"
      }
    }
  ]
}

WebSocket

REST API

In-Call

For AI Agents

List supported STT providers

Authorizations

Query Parameters

Response