Claude Opus 4.8 in xhigh down extremely intelligency, but is narrower compared to Sonnet or Haiku

Related Claude Code issues

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• [MODEL] Sonnet 4.5 is extremely myopic.
  Resolved 💬 6 #8576
• [Feature Request] Plan mode with Opus and Sonnet for doing same with Haiku mode
  Resolved 💬 3 #12957
• [Bug] Claude 3.5 Sonnet model performance regression compared to previous versions
  Resolved 💬 2 v2.1.119 #54025
• [Bug] Plan mode doesn't auto-switch between Sonnet 4.5 and Haiku 4.5
  Resolved 💬 7 #9695
• [Bug] Claude 3.5 Sonnet performance degradation compared to previous behavior
  Resolved 💬 3 v2.1.101 #46857
• [Bug] Claude 3.5 Sonnet produces more hallucinations and errors compared to previous version
  Resolved 💬 2 v2.1.118 #52486
• [BUG] EXTREMELY DETERIORATED REASONING
  Resolved 💬 2 #19034
• [MODEL] haiku 4.5
  Open 💬 2 v2.1.181 #69636

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