> ## Documentation Index
> Fetch the complete documentation index at: https://dialnexa.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# List Voice Models

> Retrieve the TTS model variants available for a given voice, each with its own latency, naturalness, and cost profile.

<Warning>
  **Legacy endpoint - deprecated.** Unversioned endpoints are scheduled for removal on **July 31, 2026**. A public v1 replacement is not currently listed in the v1 reference. This endpoint remains available for existing integrations until then.
</Warning>

Returns the text-to-speech model variants available for a given voice. Each entry corresponds to a deployable model (for example `eleven_multilingual_v2`, `eleven_turbo_v2`) and includes the upstream `provider`. Different variants of the same voice trade off latency, naturalness, and cost. Use this endpoint to populate the model selector in your agent build UI and to confirm a saved `model_id` is still supported before publishing an agent change.

## When to use this

* **Voice configuration UIs**: let the prompt author choose between latency-optimized and quality-optimized variants of the same voice.
* **Latency tuning**: switch a real-time agent to a "turbo" model when first-word latency matters more than expressiveness.
* **Cost optimization**: switch a high-volume outreach use case to a cheaper variant if naturalness is acceptable.
* **Migration safety checks**: confirm the saved `model_id` is still in the response before deploying an agent update.

## Common trade-offs

Across providers, voice models tend to cluster into three loose tiers:

* **Turbo / low latency**: fastest first-word time. Best for live conversational agents where caller perception of speed matters most.
* **Multilingual / balanced**: moderate latency with broad language support. The default for most production deployments.
* **High fidelity / premium**: best naturalness and prosody. Typically reserved for branded greetings or scripted spoken content rather than free-flowing live conversation.

## Path parameters

| Parameter | Description                                |
| --------- | ------------------------------------------ |
| `id`      | The voice ID, for example `vce_en_us_ava`. |

## Errors

* `404 Not Found` is returned when the voice does not exist or has been removed.

## Related endpoints

* [Get Voice](/docs/api-reference/v1/voices/get): fetch the voice itself.
* [List Voices](/docs/api-reference/v1/voices/list): browse the full voice catalogue.
* [Update Agent](/docs/api-reference/v1/agents/update): change the voice or model assigned to an agent.
* [Text-to-speech and voices](/docs/voice-ai/text-to-speech-and-voices): guidance on choosing the right voice model.


## OpenAPI

````yaml GET /voices/{id}/voice-models
openapi: 3.0.0
info:
  title: DialNexa API
  description: >-
    Public REST API for the DialNexa voice AI platform. Versioned endpoints are
    under /v1; unversioned endpoints are legacy and deprecated.
  version: 1.0.0
servers:
  - url: https://api.dialnexa.com
    description: DialNexa production API
security:
  - bearer: []
tags:
  - name: API Keys
  - name: Agent Functions
  - name: Agents V1
  - name: Agents2
  - name: Batch Calls
  - name: Batch Calls V1
  - name: Call Logs
  - name: Calls
  - name: Calls V1
  - name: Campaign Leads
  - name: Campaigns
  - name: External Webhooks
  - name: Knowledge Base
  - name: Knowledge Base V1
  - name: LLMs
  - name: LLMs V1
  - name: Languages
  - name: Languages V1
  - name: Organization Phone Numbers
  - name: Organization Phone Numbers V1
  - name: Phone Number Pricing
  - name: Phone Number Pricing V1
  - name: Transcribers
  - name: Transcribers V1
  - name: User Webhooks
  - name: User Webhooks V1
  - name: V1
  - name: Voices
  - name: Voices V1
  - name: Webcall
  - name: Workflow Leads
  - name: Workflow Leads V1
  - name: Workflows
  - name: Workflows V1
paths:
  /voices/{id}/voice-models:
    get:
      tags:
        - Voices
      summary: Get all voice models associated with a specific voice
      description: >-
        **Legacy endpoint - deprecated, scheduled for removal on July 31,
        2026.** Use the `/v1` version for new integrations. 
      operationId: VoicesController_getAllVoiceModels
      parameters:
        - name: id
          required: true
          in: path
          schema:
            type: string
      responses:
        '200':
          description: Returns all voice models linked to the specified voice
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/VoiceModelVoice'
        '404':
          description: Voice not found
        '500':
          description: Internal server error
      deprecated: true
components:
  schemas:
    VoiceModelVoice:
      type: object
      properties: {}
  securitySchemes:
    bearer:
      scheme: bearer
      bearerFormat: JWT
      type: http

````