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

# Model

The **Model** tab lets you select the AI engine that powers your chatbot. Your choice impacts the chatbot's **speed**, **intelligence**, and **overall performance**.

<Frame>
  <img src="https://mintcdn.com/chatzyai/ajWOA3WjuwcswwZU/ai-agents/voice-ai-agent/settings/model.png?fit=max&auto=format&n=ajWOA3WjuwcswwZU&q=85&s=156a364afdbc13c14d1e157b1564cc97" width="1087" height="368" data-path="ai-agents/voice-ai-agent/settings/model.png" />
</Frame>

***

#### Temperature

The **Temperature** slider controls how predictable or creative the AI’s responses are:

* **Reserved (0):** Highly factual and predictable responses. Best for customer support, FAQs, or data extraction.
* **Creative (>0):** More varied and imaginative responses. Ideal for brainstorming, creative writing, or casual conversations.

#### Available Models

Each model offers unique strengths for different use cases:

* **GPT-4o 128K** – Advanced, versatile model for complex and demanding tasks.
* **GPT-4o-Mini 128K** – Lightweight, fast, and cost-effective for simpler tasks.
* **Claude Sonnet 4 200K** – Balanced model with strong reasoning for multi-step problem solving.
* **Claude 3.5 Haiku 200K** – Extremely fast and affordable, best for high-volume and lightweight tasks.
* **Gemini 2.5 Flash 1M** – Efficient blend of reasoning and speed, adaptable to a wide range of tasks.

#### Custom Reasoning

With **Custom Reasoning**, the AI can process complex, multi-step problems more effectively.

* Available only for: **Claude Sonnet 4 200K** and **Gemini 2.5 Flash 1M**.

**Select Max Reasoning Tokens** <br />
When **Custom Reasoning** is enabled, you can adjust the **Max Reasoning Tokens** setting.

* This determines the AI’s "thinking budget" before generating a response.
* **Higher token count:** Better quality answers for complex queries (but may increase latency).
* **Lower token count:** Faster responses, suitable for straightforward tasks.

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### Agent Comparison Table

| Model Name                | Best For                                            | Reasoning Capability |
| ------------------------- | --------------------------------------------------- | -------------------- |
| **GPT-4o 128K**           | Most powerful and versatile; complex workflows.     | No                   |
| **GPT-4o-Mini 128K**      | Speed + cost efficiency for general tasks.          | No                   |
| **Claude Sonnet 4 200K**  | Balanced; strong reasoning for advanced problems.   | Yes                  |
| **Claude 3.5 Haiku 200K** | Ultra-fast; affordable for simple, high-volume use. | No                   |
| **Gemini 2.5 Flash 1M**   | Wide range; balances reasoning with speed.          | Yes                  |