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Claude Code Issues / #90120

[Bug] Claude Opus 5 performance regression compared to previous version

Status Closed — not planned
Reported on v2.1.247
Maintainer reply None cached
Activity 1 comment · opened Aug 27, 2026 · closed Sep 3, 2026

Bug Description
keeps drifting. i want opus 4.8 again. this is total nightmare working with Opus 5. i will cancel my subscription and go for GLM5.3flash

Environment Info

  • Platform: darwin
  • Terminal: Apple_Terminal
  • Version: 2.1.247
  • Feedback ID: 848e9f73-eafa-4fa7-bc07-41466809ea3b

Errors

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