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

# Fast Mode

> Speed up agent responses with a faster service tier.

Fast Mode switches the coding agent to a faster service tier, prioritizing response speed over extended reasoning. This is useful for straightforward tasks where you want quick turnaround.

## How to Use

1. **Start your message with `/fast`** or click the lightning bolt toggle in the composer toolbar.
2. The agent uses the fast service tier for all subsequent turns until you toggle it off.

To start every new workspace with fast mode already on, set **Fast mode** to **On** in **Agent Defaults** under [Personal → Preferences](https://tryreplicas.com/dashboard/account/preferences). You can still toggle it per workspace.

Example:

```
/fast rename this variable to camelCase
```

## Supported Agents

Fast Mode is available for **Codex** and for Claude **Opus** models. Cursor uses the selected Composer model without a separate fast-mode tier, and Opencode does not currently support fast mode.

## Trade-offs

* Faster output generation at the cost of reduced extended thinking.
* Best suited for simple, well-scoped tasks (renames, small fixes, formatting).
* For complex multi-file refactors or architectural decisions, consider keeping fast mode off.