[BUG] API Error 500 on all models - Claude Code and claude.ai completely unusable (Apr 15, 2026)

Bug Description

API Error 500 on every request, affecting all models (Opus 4.6, Sonnet 4.6). Claude.ai web also returns 'Claude will return soon' page. /login redirects to web then fails after 10 seconds.

Error Messages

API Error: 500 {"type":"error","error":{"type":"api_error","message":"Internal server error"},"request_id":"req_011Ca5jW9w1N2AqSZzDfRymV"}
API Error: 500 {"type":"error","error":{"type":"api_error","message":"Internal server error"},"request_id":"req_011Ca5kaqYU68D65Grjbu27i"}

Environment

• Platform: macOS
• Subscription: Claude Pro/Max
• Claude Code version: latest (updated today)
• Issue started: April 15, 2026 ~16:00 CET
• /usage returns rate_limit_error
• /status renders garbled (vertical text)

Steps to Reproduce

1. Open Claude Code
2. Send any prompt
3. 500 error on every request, all models

Additional Context

claude.ai web shows maintenance page. Status page shows All Systems Operational despite widespread failures.