[BUG] Option-based key input on MacOS not working in Terminal client

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?

Bug Description

Typing special characters using option-based key inputs on MacOS (e.g., ‘, ∑, π) no longer works in the Claude Code Terminal client. Previously, holding the Option key and pressing certain keys would input these characters, but this functionality appears to be broken in recent versions.

Expected Behavior

Option+key combinations should input the correct special characters as they do in the MacOS system Terminal and other native apps.

What Should Happen?

Actual Behavior

Option+key combinations do not input any character, or the wrong character appears.

Environment

• MacOS version: 15.3.1 (24D70)
• Claude Code app version: 2.0.36
• Terminal client (if relevant): Terminal.app, via Tmux

Error Messages/Logs

Steps to Reproduce

Steps to Reproduce

1. Open the Claude Code Terminal client on macOS.
2. Attempt to type Option+] for ‘, Option+W for ∑, Option+P for π, etc.
3. Observe that the expected character is not input.

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.0.36 (Claude Code)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_