***

title: Model Selection
sidebarTitle: Model Selection
description: Choose the right AI model for your agent.
------------------------------------------------------

The model is your agent's brain. It's what understands what callers say, figures out how to respond, and generates the words your agent speaks. Different models have different strengths — some are faster, some are more expressive, some are more affordable.

**Location:** Prompt Section (top bar) → Model dropdown

<Frame caption="Model selection dropdown">
  ![Model dropdown](https://files.buildwithfern.com/smallest-ai.docs.buildwithfern.com/38cac70a4f0a3cb4d16863e30107d14a81a96567fe9b090edcc65b0130eb3177/products/atoms/pages/platform/building-agents/images/model-dropdown.png)
</Frame>

***

## Available Models

| Model                 | Provider    | Type        | Credit Usage |
| --------------------- | ----------- | ----------- | ------------ |
| **Electron**          | Smallest AI | Traditional | Lower        |
| **GPT-4o**            | OpenAI      | Traditional | Moderate     |
| **GPT-4.1**           | OpenAI      | Traditional | Moderate     |
| **GPT Realtime**      | OpenAI      | Emotive     | Higher       |
| **GPT Realtime Mini** | OpenAI      | Emotive     | Higher       |

**Emotive models** have emotional awareness — they pick up on caller tone and respond with natural expression.

<Tip>
  **Getting started?** GPT-4o is a great all-rounder — reliable, capable, and well-tested.
</Tip>

<Tip>
  **Try Electron.** It's our own model, built specifically for voice. Fast, affordable, and optimized for real-time conversations.
</Tip>

You can switch models anytime — nothing breaks when you do.

***

## Related Settings

<CardGroup cols={2}>
  <Card title="Voice Selection" icon="microphone" href="/atoms/atoms-platform/single-prompt-agents/prompt-section/voice-selection">
    Pick your agent's voice
  </Card>

  <Card title="Model Settings" icon="sliders" href="/atoms/atoms-platform/single-prompt-agents/agent-settings/model-settings">
    Language switching & fine-tuning
  </Card>
</CardGroup>