[BUG] Intermittent API 500 Internal Server Error (Feb 25, 2026, Opus 4.6)

Bug Description

Experiencing repeated intermittent API 500 Internal Server Errors during Claude Code sessions. The errors disrupt workflow and require retrying.

Error Details

API Error: 500 {"type":"error","error":{"type":"api_error","message":"Internal server error"},"request_id":"req_011CYV9chhKZqQzx4qCxQwrA"}

Environment

• Claude Code version: latest
• Model: claude-opus-4-6
• OS: macOS (Darwin 25.3.0)
• Date: February 25, 2026

Steps to Reproduce

1. Use Claude Code normally with Opus 4.6
2. Errors appear intermittently — not tied to a specific action
3. Status page (status.claude.com) shows all systems operational during occurrence

Expected Behavior

API requests should succeed or return meaningful error codes, not 500 Internal Server Error.

Additional Context

This appears to be part of an ongoing pattern of 500 errors throughout February 2026. Related issues: #27733, #27559, #15126.

The included request_id (req_011CYV9chhKZqQzx4qCxQwrA) should allow server-side tracing.