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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.

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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, enable Fast Mode in your account settings under Preferences. You can still toggle it per workspace. Example: 
/fast rename this variable to camelCase

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Supported Agents

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

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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.