Claude desktop app launches but shows no window on macOS 26

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?

Platform

macOS: 26.4.1 (Build 25E253, Darwin 25.4.0)
Claude.app: installed at /Applications/Claude.app
Problem
When launching the Claude desktop app, no window or UI appears.
The app process starts silently and never shows a window.

Observed behavior

The main process and helper processes (GPU, Network) spawn successfully
No renderer process is created
No window appears
No crash report is generated in ~/Library/Logs/DiagnosticReports/
~/Library/Application Support/Claude/ remains empty (no state written)
AppleScript reports the app has no windows

Workarounds tried

Force quit and relaunch
Deleted ~/Library/Application Support/Claude/
Reset window position with: defaults delete com.anthropic.claudefordesktop
NSWindow*
Reinstalled the app
Ran open -a Claude from Terminal

What Should Happen?

Claude Desktop should show UI on startup

Error Messages/Logs

Steps to Reproduce

Install Claude on macOS: 26.4.1 (Build 25E253, Darwin 25.4.0)
Open the app and see if UI window appears

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

Claude 1.13576.4 (414f85)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_