Claude Code v2.1.37 Release Notes

Claude Code v2.1.37 fixes the /fast command availability issue after enabling /extra-usage. Quick patch release for improved user experience.

February 8, 2026 • 10 min read • By ClaudeWorld

Claude Code v2.1.37 is now available with an important fix for power users who rely on the /fast command functionality. This patch release addresses a specific issue that was affecting users who enabled the /extra-usage feature.

What’s New

/fast Command Availability Fix

The primary focus of this release is fixing an issue where the /fast command was not immediately available after enabling /extra-usage. This was causing workflow interruptions for users who needed quick access to the fast processing mode right after expanding their usage capabilities.

Key improvements:

  • Immediate availability: The /fast command now becomes available instantly after enabling /extra-usage
  • Smoother workflow: No more waiting or workarounds needed to access fast processing
  • Enhanced reliability: The command activation process has been streamlined

How to Update

To update to Claude Code v2.1.37:

  1. Check your current version with the version command
  2. Follow your standard update procedure for Claude Code
  3. Restart your development environment if required
  4. Verify the fix by testing the /fast command after enabling /extra-usage