Sonnet as fallback model during Opus peak-hour limits produces unacceptable code quality

Related Claude Code issues

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• [BUG] Unacceptable File Access
  Resolved 💬 1 #73626
• [Bug] Model fallback to Opus despite Sonnet configuration causing rate limits
  Resolved 💬 3 #11390
• Frequent 529 Overloaded errors on Max plan (00/month) — unacceptable service quality
  Resolved 💬 6 #39775
• [BUG] Stats dashboard "Peak hour" appears off by one hour
  Resolved 💬 1 v2.1.121 #63044
• 5-hour session limit draining unusually fast during normal peak hours (April 23)
  Resolved 💬 5 v2.1.119 #52779
• [Feature Request] Graceful model fallback on overloaded_error — stop stalling sessions during peak load
  Resolved 💬 3 #49013
• [BUG] usage limit with sonnet (default) with 70% of my 5 hour window available.
  Resolved 💬 4 #60751
• [BUG] Pro plan: 4% of 5-hour limit consumed by ~5 text messages in claude.ai at midnight (off-peak)
  Resolved 💬 2 v2.1.87 #40520

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