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

# Models

> Explore the available text-to-speech models and their capabilities

# Voicelab Models

Voicelab provides access to state-of-the-art open-source text-to-speech models.

## Featured Models

### Sesame CSM-1B

**State-of-the-art conversational speech model**

This model is **optimized** and certain voices are **professionally cloned**.
This means that we offer fast, low-cost inference for this model, and that select voices will have more consistent quality.

* **Parameters**: 1 billion
* **Specialization**: Natural conversation and dialogue
* **Languages**: English
* **Key Features**:
  * Exceptional naturalness in conversational contexts
  * Low latency inference
  * Consistent voice quality across long generations
  * Optimized for real-time applications

### Dia

**general-purpose TTS model**

<Warning>
  This model is not yet optimized or post-trained. Generation quality may be inconsistent.
</Warning>

* **Parameters**: 1.6 billion
* **Specialization**: General-purpose text-to-speech
* **Languages**: English
* **Key Features**:
  * Accepts emotive tokens (e.g. laughing, sighing)
  * Efficient inference
  * Less stable than CSM-1B

**Emotive Tags**: `(laughs)`, `(clears throat)`, `(sighs)`, `(gasps)`, `(coughs)`, `(singing)`, `(sings)`, `(mumbles)`, `(beep)`, `(groans)`, `(sniffs)`, `(claps)`, `(screams)`, `(inhales)`, `(exhales)`, `(applause)`, `(burps)`, `(humming)`, `(sneezes)`, `(chuckle)`, `(whistles)`

### Orpheus

**Expressive and emotional speech synthesis**

<Warning>
  This model is not post-trained; the hosted weights are as-is.
</Warning>

* **Parameters**: 750 million
* **Specialization**: Emotional and expressive speech
* **Languages**: English (primary)
* **Key Features**:
  * Advanced emotional control
  * Dynamic prosody and intonation
  * Character voice capabilities
  * Rich vocal expressions

**Emotive tags**: `<laugh>`, `<chuckle>`, `<sigh>`, `<cough>`, `<sniffle>`, `<groan>`, `<yawn>`, `<gasp>`

### Coming Soon

Kokoro, Chatterbox, Kyutai TTS

## Model Specifications

### Supported Features

| Feature             | Sesame CSM-1B | Dia | Orpheus |
| ------------------- | ------------- | --- | ------- |
| Voice Cloning       | ✅             | ✅   | ✅       |
| Emotive Tokens      | ❌             | ✅   | ✅       |
| Multi-speaker       | ✅             | ✅   | ✅       |
| Real-time Streaming | ✅             | ✅   | ✅       |
| Custom Fine-tuning  | ✅             | ✅   | ✅       |

<Note>
  While CSM-1B doesn't accept emotive tokens (laugh/sigh/etc.), it has the capacity to generate these artifacts in output audio based on conversational context.
</Note>