[BUG] MacOS: shift + option + left/right arrow no longer moves cursor by 1 word at a time

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Normally when I chat with Claude Code, I constantly use shift + option + left/right arrows to jump cursor one word back/forward, make edits etc. Today, in all my new claude code sessions, this no longer works. The cursor only moves 1 character at a time.

Claude Code version 2.1.72, running in iterm2, MacOS.

What Should Happen?

When focused in my chat message, shift + option + left/right keys should jump my cursor by 1 word back/forward as God intended.

Error Messages/Logs

Steps to Reproduce

• Open claude
• write 3+ words in your chat
• press shift + option + left
• observe that your cursor only moved left by 1 character, not 1 word
• cry

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

2.1.71

Claude Code Version

2.1.72

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

iTerm2

Additional Information

_No response_