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

# Fast and Focus Modes

When interacting with Olly, you can choose how Olly answers your questions by selecting a mode before sending your prompt. Each mode is optimized for a different type of task, balancing speed and depth of reasoning.

You can change the mode at any time while chatting with Olly.

## Supported modes

Olly currently supports two modes:

* **Fast mode**: optimized for speed and simplicity.
* **Focus mode**: optimized for deeper reasoning and investigation.

<img src="https://mintcdn.com/olly/4-8d5cHduG6kzgv9/content/images/fast_mode_new.gif?s=513ea50d9892c2f1380f9dcca7d36f8a" alt="Fast Mode demo" width="800" height="464" data-path="content/images/fast_mode_new.gif" />

You can choose a mode from the input bar each time you send a prompt, and it takes effect immediately.

Switching modes is possible at any time during the conversation. This allows you to start fast and switch to deeper analysis only when needed.

## Fast mode

Fast mode is designed for quick responses and lightweight tasks.

* **Model used**: GPT-5 mini
* **Best for**:
  * Simple questions
  * Quick lookups
  * Basic data queries
* **Characteristics**:
  * Very fast response time
  * Simplified reasoning optimized for speed

Use Fast mode when you need a quick answer to simple questions, fast lookups, or basic data queries where speed matters more than deep reasoning.

**Examples**:

* “Show error rate for checkout service in the last hour”
* “What is the current CPU usage of node-3?”
* “List alerts fired in the last 10 minutes”

## Focus mode (default)

Focus mode is Olly’s default and most powerful mode.

* **Model used**: GPT-5.1
* **Best for**:
  * Complex investigations
  * Root-cause analysis
  * Exploratory observability questions
* **Characteristics**:
  * Deeper analysis and reasoning
  * Takes longer to respond than Fast mode
  * Uses multiple specialized sub-agents, each acting as an expert in a specific domain (for example, logs agent).

Choose Focus mode for in-depth analysis tasks, such as investigating issues, uncovering root causes, or exploring observability data that require a deeper level of analysis.

**Examples**:

* “Why did latency spike after the last deployment?”
* “Investigate the root cause of intermittent 5xx errors”
* “Correlate error logs with recent infrastructure changes”