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

# 2. LLM Model

The LLM is the brain of the agent. It generates responses and controls how the agent handles the conversation.

<Tip>
  **Recommended model:** Use `callkaro/arjuna-2.5` for your agent's LLM. It is optimized for real-time voice conversations.
</Tip>

## Temperature

To fine-tune the brain (make it sharper or more creative), use the Temperature setting in the LLM Model section. You can set it between 0 and 1 — the higher the temperature, the broader and more creative the agent becomes.

<Tip>
  **Tip:** Start with `callkaro/arjuna-2.5`, build your use case, and then tune the temperature based on how the agent responds.
</Tip>

## Secondary LLM

But what if the main brain fails? That is where the Secondary LLM comes in — it is a backup brain. If the primary LLM goes down, the secondary one quietly takes over, and the customer on the other end won't even notice.