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

# Models

> Manage LLM, TTS, and STT models for your voice agents.

# Models

The Models page centralizes all AI models used by your agents across three tabs: **LLM** (language models), **TTS** (text-to-speech voices), and **STT** (speech-to-text providers).

## LLM Tab

### Built-in Models

Callem provides pre-configured LLM providers with multiple model options. These are available to all agents by default.

### Custom Models (Bring Your Own Model)

Connect any OpenAI-compatible LLM endpoint to use your own models. This works with any provider exposing the standard chat completions API.

#### Adding a Custom Model

1. Navigate to **Build > Models > LLM**
2. Click **Add Custom Model**
3. Fill in the form:

| Field            | Description                                                                       |
| ---------------- | --------------------------------------------------------------------------------- |
| **Display Name** | How the model appears in dropdowns (e.g. "My Llama 3.1 70B")                      |
| **Base URL**     | The API endpoint without `/chat/completions` (e.g. `https://api.together.xyz/v1`) |
| **API Key**      | Your provider's API key — stored encrypted server-side                            |
| **Model ID**     | The model identifier (e.g. `meta-llama/Llama-3.1-70B-Instruct`)                   |

4. Click **Test Connection** to verify the endpoint responds
5. Click **Add Model**

Once added, the custom model appears in the LLM provider dropdown when configuring agents.

<Info>
  The Test Connection sends a minimal request (`max_tokens: 5`) to verify the URL, API key, and model ID are correct. Cost is negligible.
</Info>

#### Managing Custom Models

Use the action menu (three dots) on each custom model to:

* **Test Connection** — verify the endpoint is still reachable
* **Edit** — update name, URL, or API key
* **Duplicate** — create a copy with "(copy)" suffix
* **Delete** — remove the model (agents using it will need reconfiguration)

## TTS Tab — Voice Library

### Built-in Voices

Browse all available TTS voices across providers. For each voice:

* **Preview** — click the play button to hear a sample
* **Filter** — by provider, gender (male/female), or search by name

### Voice Cloning

Create custom voices from audio samples.

#### Cloning a Voice

1. Click **Clone Voice**
2. Fill in the form:

| Field               | Required | Description                                           |
| ------------------- | -------- | ----------------------------------------------------- |
| **Reference Audio** | Yes      | WAV or MP3 file, 5-20 seconds, clean audio            |
| **Transcription**   | Yes      | Exact text spoken in the audio sample                 |
| **Voice Name**      | Yes      | Display name (e.g. "Sophie - Commerciale")            |
| **Language**        | Yes      | Default language for the voice                        |
| **Gender**          | Yes      | Male or Female                                        |
| **Description**     | No       | Internal notes (e.g. "warm tone, for solar campaign") |
| **Tags**            | No       | Comma-separated labels for filtering                  |

3. Click **Upload & Clone**

Cloned voices appear in the "My Voices" section and are also available in the agent Voice Browser when selecting a TTS voice.

<Warning>
  Audio quality matters. Use a clean recording with minimal background noise, recorded at a consistent volume. Mono audio at 24kHz is ideal.
</Warning>

### My Voices Filter

When you have cloned voices, a **My Voices** filter appears in both the Models page and the agent Voice Browser, letting you quickly find your custom voices.

## STT Tab — Speech-to-Text

Browse available STT providers and their supported languages. Each provider card shows:

* Provider name
* Number of supported languages
* Expandable language list with flag, label, and code

<Tip>
  Custom STT endpoints (Bring Your Own STT) are coming soon.
</Tip>