[BUG] When pressing the numpad Enter key in Claude Code, it inserts the literal text [57414u instead of submitting input. The regular Enter key works correctly.

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?

Environment:

• OS: macOS (Darwin 24.6.0)
• Claude Code version: 2.1.3
• Keyboard: Wooting Two HE AVR

Expected behavior:
Numpad Enter should behave identically to the main keyboard Enter key (and did before)

Actual behavior:
Numpad Enter inserts the literal characters [57414u into the input field.

Technical details:
The sequence [57414u is a CSI u-sequence from the kitty keyboard protocol (enhanced keyboard mode). This suggests Claude Code is enabling the enhanced keyboard protocol via escape sequences but not properly decoding the responses.

Specifically:

• Claude Code appears to send ESC [ > 1 u to enable CSI u mode
• When numpad Enter is pressed, the terminal sends ESC [ 57414 u
• Claude Code isn't parsing this sequence and instead displays it literally

Workaround:
Use the regular Enter key instead of numpad Enter.

Note:
This works correctly in iTerm2, suggesting it's specific to Claude Code's terminal input handling.

What Should Happen?

I hit the number pad return and it acts like the same function as the enter key.

Error Messages/Logs

It doesn't count as a retun when selecting an option, or inputs "[57414u" as text on hitting the key

Steps to Reproduce

Hit the return key on a a mac on wooting two he keyboard

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.3

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

iTerm2

Additional Information

_No response_