[Bug] Claude 4.8 code generation quality degradation with x-high effort setting

Resolved 💬 2 comments Opened Jun 3, 2026 by thomasacook Closed Jun 7, 2026

Bug Description
Claude 4.8 seems dumber, taking way too much rework on extra high effort. Gemini finding bugs all day in code generated by 4.8 x-high

Environment Info

  • Platform: darwin
  • Terminal: iTerm.app
  • Version: 2.1.160
  • Feedback ID: 8ab374db-2999-4416-82bb-af291a0cfa7a

Errors

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