API Error 500 - Internal server error affecting all chats

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?

API Error 500 on all prompts. Claude Code returns Internal Server Error on every request, across all terminals and conversations simultaneously.

What Should Happen?

Claude Code should respond normally to prompts without server errors.

Error Messages/Logs

**Bug Description**
API Error: 500 {"type":"error","error":{"type":"api_error","message":"Internal server error"},"request_id":"req_011CXmQ5xRKYf3Zd2k8EUHKo"}

**Environment**
- Platform: Windows (PowerShell)
- Subscription: Claude Max ($100/month)
- Claude Code version: 2.1.29
- Issue started: February 3, 2026, ~16:40 CET

**Behavior**
- Error occurs on ALL chats/terminals simultaneously
- Was working seconds before the error started
- Restarting terminal doesn't fix it
- Affects all conversations, not just one
- Updated Claude Code to latest version (2.1.29) - issue persists

**Request IDs**
- req_011CXmPLuGNCwCCzQ4zw8m2f
- req_011CXmQ5xRKYf3Zd2k8EUHKo

**Additional context**
Multiple terminals with different conversations all failed at the same time. Clean update didn't resolve the issue.

Steps to Reproduce

1. Open PowerShell
2. Run claude
3. Type any prompt
4. Error appears: API Error: 500 {"type":"error","error":{"type":"api_error","message":"Internal server error"}}

Claude Model

Not sure / Multiple models

Is this a regression?

Yes, this worked in a previous version

Last Working Version

2.1.29 (same version - was working minutes before)

Claude Code Version

2.1.29 (Claude Code)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

Subscription: Claude Max ($100/month)
Issue started: February 3, 2026, ~16:40 CET
Multiple request IDs affected - this is a server-side issue, not local.