[Bug] Significant performance regression in Claude Code quality and instruction following

Bug Description
performing poorly. weak instruciton following. low quality design. regression. worse than 4.6. much worse. low intelligence - poor strategy and or execution choices.

Environment Info

• Platform: win32
• Terminal: cursor
• Version: 2.1.139
• Feedback ID: 1b5929ea-1399-4845-97c6-d83654f17862

Errors

[{"error":"Error: Request was aborted.\n    at makeRequest (B:/~BUN/root/src/entrypoints/cli.js:51:6192)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-05-12T18:40:53.428Z"}]