***

title: Model Settings
sidebarTitle: Model Settings
description: 'Configure AI model, global prompt, and knowledge base.'
---------------------------------------------------------------------

Model Settings control how the AI behaves across your flow — the model powering responses, global instructions, and knowledge base connection.

**Location:** Settings tab → Model

<Frame caption="Model tab for Conversational Flow agents">
  ![Model settings](https://files.buildwithfern.com/smallest-ai.docs.buildwithfern.com/ea130af99710a923f8859e274879cfc481eb753b2c8df5d6a18d9acea55ceb24/products/atoms/pages/platform/building-agents/images/cf-model-settings.png)
</Frame>

<Note>
  Conversational Flow agents have **Global Prompt** and **Knowledge Base** in this tab since individual prompts are defined per-node in the workflow.
</Note>

***

## AI Model

| Setting       | Description                           |
| ------------- | ------------------------------------- |
| **LLM Model** | The AI model (Electron, GPT-4o, etc.) |
| **Language**  | Primary language for responses        |

***

## Global Prompt

Set global instructions for your agent's personality and behavior. This applies across all nodes (limit: 4,000 characters).

Use this for:

* Personality traits
* Behavioral guidelines
* Consistent phrasing
* Company-specific instructions

Node-specific prompts add to the Global Prompt. Use Global Prompt for consistency, node prompts for specific questions.

***

## Knowledge Base

Connect a knowledge base for reference material.

| Option                | Description                  |
| --------------------- | ---------------------------- |
| **No Knowledge Base** | Agent uses only prompts      |
| **\[Your KB]**        | Agent can search for answers |

***

## Speech Formatting

When enabled (default: ON), transcripts are automatically formatted for readability — punctuation, paragraphs, and proper formatting for dates and numbers.

***

## Language Switching

Enable your agent to switch languages mid-conversation (default: ON).

### Advanced Settings

| Setting              | Default | Description                        |
| -------------------- | ------- | ---------------------------------- |
| **Minimum Words**    | 2       | Words before considering a switch  |
| **Strong Signal**    | 0.7     | Confidence for immediate switch    |
| **Weak Signal**      | 0.3     | Confidence for tentative detection |
| **Consecutive Weak** | 2       | Weak signals needed to switch      |

Defaults work for most cases. Adjust only if seeing unwanted switching.

***

## Next

<CardGroup cols={2}>
  <Card title="Knowledge Base" icon="book" href="/atoms/atoms-platform/features/knowledge-base">
    Create and manage knowledge bases
  </Card>

  <Card title="Voice Settings" icon="volume" href="/atoms/atoms-platform/conversational-flow-agents/agent-settings/voice-settings">
    Configure speech and pronunciation
  </Card>
</CardGroup>