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reopt Handbook
Claude Code Command MasterLabels and command selectionHow to read a detail guideComplete command listTerminal CLI Commands and Flags

Task guides

Core command basicsStarting and resuming workSkills and Custom CommandsAutomation and Web CommandsOperations and Safety CommandsCustom commands and skillsMCP connections and commands

Conversation and context

Cmd. /add-dirCmd. /backgroundCmd. /compactCmd. /contextCmd. /copyCmd. /exportCmd. /forkCmd. /importCmd. /initCmd. /memoryCmd. /recapCmd. /renameCmd. /resumeCmd. /rewindCmd. claude project purge

Planning and execution

Cmd. /autofix-prCmd. /batchCmd. /desktopCmd. /goalCmd. /loopCmd. /planCmd. /remote-envCmd. /scheduleCmd. /tasksCmd. /teleportCmd. /workflows

Review and verification

Cmd. /code-reviewCmd. /runCmd. /run-skill-generatorCmd. /security-reviewCmd. /simplifyCmd. /verify

Models and settings

Cmd. /claude-apiCmd. /configCmd. /effortCmd. /fastCmd. /modelCmd. /output-styleCmd. /update-config

Permissions and integrations

Cmd. /agentsCmd. /hooksCmd. /ideCmd. /mcpCmd. /permissionsCmd. /pluginCmd. /reload-pluginsCmd. /reload-skillsCmd. /sandboxCmd. /skillsCmd. /web-setup

Status and diagnostics

Cmd. /debugCmd. /diffCmd. /doctorCmd. /fewer-permission-promptsCmd. /release-notesCmd. /team-onboarding

Display and input

Cmd. /colorCmd. /focusCmd. /keybindingsCmd. /powerupCmd. /statuslineCmd. /terminal-setupCmd. /themeCmd. /tui

Account and usage

Cmd. /upgradeCmd. /usageCmd. /usage-credits

Legacy

Cmd. /costCmd. /pr-commentsCmd. /reviewCmd. /statsCmd. /ultrareviewCmd. /vimCmd. /approved-toolsCmd. /commandsCmd. /extra-usageCmd. /settingsCmd. /tagCmd. /todos

Verification and history

Current verification scopeHandbook updatesRelease coverage historyEarlier verification recordsCommand change history
Handbook›Claude Code Command Master›Cmd. /fast
한국어English

Cmd. /fast

Switches the supported model's fast processing path. It is separate from reasoning effort and may have different billing or quota rules.

Key takeaways

  • Toggle fast mode.
  • Check the input surface and availability before using the examples below.

Purpose

Toggle fast mode.

/fast [on|off]

Availability

FieldValue
Input surfaceRunning CLI prompt
KindBuilt-in
StatusCurrent reference
Aliases—
Documented minimumNot specified
Reviewed against2026-09-22 · Claude Code 2.1.278

The installed command menu and account or organization settings determine availability.

Examples

/fast

Effects and persistence

Switches the supported model's fast processing path. It is separate from reasoning effort and may have different billing or quota rules.

Remote sessions

Cloud and self-hosted-runner Remote sessions honor the host fast-mode setting or /fast where organization policy permits.

Changelog

Cautions

Fast mode has its own availability and pricing. Do not treat it as a lower reasoning-effort setting.

Official sources

  • Commands
  • Fast Mode

Complete command list · Verification scope

Related docs

Cmd. /fast

Codex Command Master · Turn Fast mode on or off, or report its status, to change the service tier without changing reasoning effort.

Cmd. /upgrade

Opens the billing flow for moving to a higher plan.

Cmd. /release-notes

Displays selected release notes in the transcript without adding them to model conversation context.

Cmd. /permissions

Codex Command Master · Change Codex approval and permission policy during a session.

Cmd. /plan

Codex Command Master · Switch to plan mode and optionally send a planning prompt.

Cmd. /effort

Set or inspect model-specific reasoning effort.

Cmd. /model

Saves the selected model as the default for new sessions. Press s on a picker row, or use a supported -p invocation, for a session-only change.

On this page

PurposeAvailabilityExamplesEffects and persistenceRemote sessionsCautionsOfficial sources