Command reference · Claude Code
/effort
Sets the model's effort level (reasoning depth).
Values: low, medium, high, xhigh, max, ultracode — depending on the model; max/ultracode only for the current session. ultracode = xhigh reasoning plus automatic workflow orchestration. 'auto' = model default. Without an argument, an interactive slider opens. Takes effect immediately. From v2.1.205 also non-interactive (-p).
✅ WHEN TO USE IT?
Raise thinking effort before a tricky task
/effort high
Pick a level interactively via slider
/effort
⛔ WHEN NOT TO?
Fundamentally need a different model
/effort only changes the thinking-effort level of the current model, not its capabilities.
Better: /model
SOURCES
- Claude Code Doku (offiziell) ↗ code.claude.com