[BUG] ERR_BAD_REQUEST on startup — authorization menu never appears

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: ERR_BAD_REQUEST on startup — authorization menu never appears

Environment:

• OS: Windows 11
• Node.js: v22
• Claude Code: v2.1.90

Problem:
Claude Code fails immediately on startup with the following error, before the login menu even appears:

Unable to connect to Anthropic services
Failed to connect to api.anthropic.com: ERR_BAD_REQUEST

What I tried:

• Reinstalled Claude Code multiple times
• Reinstalled Node.js
• Cleared all config files (~/.claude)
• Removed ANTHROPIC_API_KEY environment variable
• Tried with and without VPN
• Tried from mobile hotspot
• Ran as Administrator

Key finding:
Node.js itself can reach the API fine:

node -e "const https = require('https'); https.get('https://api.anthropic.com/v1/models', {headers: {'x-api-key': 'test'}}, (r) => console.log('Status:', r.statusCode)).on('error', (e) => console.log('Error:', e.message))"

Returns: Status: 403 (expected — means network is working)

So the issue is specific to how Claude Code makes its initial request, not the network or Node.js itself.

What Should Happen?

The login menu should appear, allowing me to choose between Claude.ai Subscription, Anthropic Console, or Bedrock/Foundry.

Error Messages/Logs

Steps to Reproduce

1. Install Claude Code: npm install -g @anthropic-ai/claude-code
2. Run: claude
3. Error appears immediately, login menu never shows

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

2.1.90

Claude Code Version

2.1.90

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

VS Code integrated terminal

Additional Information

_No response_