API Error: 500 Internal server error on every new request

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?

Every new request fails with 500 Internal Server Error.
Issue is reproducible on clean fresh requests, not related
to context size or conversation history.

Error: API Error: 500 {"type":"error","error":{"type":"api_error",
"message":"Internal server error"},"request_id":"req_011Ca5jvfHX9dK24mPKRSAzd"}
API Error: 500 {"type":"error","error":{"type":"api_error","message":"Internal server error"},"request_id":"req_011Ca5kFKVvbGZdy5eA48kfW"} ·
⎿  API Error: 500 {"type":"error","error":{"type":"api_error","message":"Internal server error"},"request_id":"req_011Ca5kFKVvbGZdy5eA48kfW"} ·
check status.claude.com

What Should Happen?

Request should return a valid response from the API.

Error Messages/Logs

API Error: 500 {"type":"error","error":{"type":"api_error","message":"Internal server error"},"request_id":"req_011Ca5jvfHX9dK24mPKRSAzd"}
API Error: 500 {"type":"error","error":{"type":"api_error","message":"Internal server error"},"request_id":"req_011Ca5k5g7sbBbn2hhbmBxZR"} · 
     check status.claude.com
API Error: 500 {"type":"error","error":{"type":"api_error","message":"Internal server error"},"request_id":"req_011Ca5kFKVvbGZdy5eA48kfW"} · 
     check status.claude.com

Steps to Reproduce

1. Open Claude Code
2. Start a new session / fresh chat
3. Send any message (e.g. "hello")
4. Immediately get 500 Internal Server Error
5. Reproducible on every attempt, multiple times

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.109

Platform

Other

Operating System

Ubuntu/Debian Linux

Terminal/Shell

Terminal.app (macOS)

Additional Information

Error persists across multiple sessions and fresh restarts.
Issue started today April 15, 2026. API status page shows
operational but error is consistent.