# Speech Synthesis

> Generate speech and manage MiniMax voices through UniAll async audio APIs.

Canonical URL: https://docs.uniall.ai/models/audio/speech-synthesis
Locale: en

Use MiniMax Speech HD models to generate speech from text. Voice management APIs can list system voices and create reusable private `voice_id` values through voice cloning or voice design.

## When To Use It

- Generate voiceover for short videos, ads, courses, narration, or digital humans.
- Use a public voice from the voice list.
- Clone or design a private voice, then pass its `voice_id` into a speech task.

## Supported Models

| Model | Type | Recommended use |
| --- | --- | --- |
| `minimax-speech-2.8-hd` | Text to speech | Natural short-form speech, emotional narration, ads, digital-human voiceover. |
| `minimax-speech-02-hd` | Text to speech | Audiobooks, course narration, customer-service voice, news reading, long-form narration. |

## Endpoint

```http
POST /v1/audio/tasks
GET  /v1/audio/tasks/{task_id}
GET  /v1/audio/voices
POST /v1/audio/voices/clone
POST /v1/audio/voices/design
```

## Authentication

```http
Authorization: Bearer sk-***
Content-Type: application/json
```

## Speech Request Parameters

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `model` | string | Yes | `minimax-speech-2.8-hd` or `minimax-speech-02-hd`. |
| `text` | string | Yes | Text to synthesize. |
| `voice_id` | string | Yes | Public or private voice ID. |
| `speed` | number | No | Speaking speed when supported by the model. |
| `volume` | number | No | Output volume when supported. |
| `pitch` | number | No | Pitch adjustment when supported. |
| `format` | string | No | Output format, such as `mp3` or `wav`, when supported. |
| `language` | string | No | Language hint for multilingual text. |
| `audio_setting` | object | No | Advanced audio settings passed through to the provider when supported. |

## Speech Request Example

```bash
curl -X POST "{BASE_URL}/v1/audio/tasks" \
  -H "Authorization: Bearer sk-***" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "minimax-speech-2.8-hd",
    "text": "Welcome back. Today we will introduce a faster way to build AI applications.",
    "voice_id": "voice_xxx",
    "format": "mp3",
    "speed": 1
  }'
```

## Submit Response

```json
{
  "task_id": "task_xxx",
  "status": "queued",
  "model": "minimax-speech-2.8-hd",
  "created_at": 1773980459
}
```

## Query Task Status

```bash
curl "{BASE_URL}/v1/audio/tasks/task_xxx" \
  -H "Authorization: Bearer sk-***"
```

```json
{
  "task_id": "task_xxx",
  "status": "succeeded",
  "progress": "100%",
  "output": {
    "audio_url": "https://example.com/speech.mp3"
  },
  "error": null
}
```

## Voice Management

List available voices:

```bash
curl "{BASE_URL}/v1/audio/voices" \
  -H "Authorization: Bearer sk-***"
```

Clone a voice from reference audio:

```bash
curl -X POST "{BASE_URL}/v1/audio/voices/clone" \
  -H "Authorization: Bearer sk-***" \
  -H "Content-Type: application/json" \
  -d '{
    "name": "brand-narrator",
    "audio_url": "https://example.com/reference.wav"
  }'
```

Design a voice from text:

```bash
curl -X POST "{BASE_URL}/v1/audio/voices/design" \
  -H "Authorization: Bearer sk-***" \
  -H "Content-Type: application/json" \
  -d '{
    "name": "warm-host",
    "description": "Warm, clear, young adult narrator for product explainers"
  }'
```

Use the returned `voice_id` in later speech tasks.

## Billing Notes

Speech generation is billed by generated audio usage. Voice cloning and voice design may be billed separately because they create reusable private voices. Exact prices should come from the current product pricing surface.

## Common Errors

- Missing `text` or `voice_id`.
- Passing a private `voice_id` that is not visible to the current account.
- Submitting very long text without splitting it into smaller tasks.
- Using an unsupported output format.
- Insufficient balance or disabled API key.

## Related Pages

- [Audio and Music Overview](/models/audio/overview)
- [Music Generation](/models/audio/music-generation)
- [Digital Human Video](/models/avatar/digital-human)