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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. /effort
한국어English

Cmd. /effort

Set or inspect model-specific reasoning effort.

Key takeaways

  • Set or inspect model-specific reasoning effort.
  • Check the input surface and availability before using the examples below.

Purpose

Set or inspect model-specific reasoning effort.

/effort [level|auto|status]

Availability

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

Use a level supported by the model. In -p on v2.1.205+, changes are session-scoped; Fable 5, Opus 4.8, and Opus 4.7 retain their defaults for this slash change, so use --effort.

Examples

/effort status

Effects and persistence

Adjusts reasoning effort for the active model. Session-only values and saved defaults depend on the model, level, and input surface.

Inspecting or resetting effort

Use /effort status to inspect the active level. /effort auto returns to the model default. Supported levels differ by model; check the model configuration reference before selecting one.

Cautions

max and ultracode can be session-only selections; explicitly configured ultracode has different persistence. Check the model-specific rules.

Official sources

  • Commands
  • Model Config

Complete command list · Verification scope

Related docs

Cmd. /review

Reviews the diff or selected target. --fix requests edits and --comment requests posted comments, expanding the operation's effects.

Cmd. /model

Codex Command Master · Switch among GPT-6 Astra, GPT-5.6 Sol, Terra, Luna, and supported reasoning effort levels.

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. /fast

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

Prompting Best Practices

Claude Code Complete Guide · How to prompt effectively in Claude Code — clear instructions, context and examples, effort control, action triggering, autonomy and safety.

Cmd. /config

Open settings or apply direct key/value settings (/settings).

Cmd. /fast

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

On this page

PurposeAvailabilityExamplesEffects and persistenceInspecting or resetting effortCautionsOfficial sources