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claude-code - 💡(How to fix) Fix [Bug] Claude 3.5 Sonnet produces more hallucinations and errors compared to previous version [1 participants]

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anthropics/claude-code#52486•Fetched 2026-04-24 06:05:54
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Bug Description opus 4.7 makes so many more mistakes, hallucinations than opus 4.6

Environment Info

  • Platform: darwin
  • Terminal: iTerm.app
  • Version: 2.1.118
  • Feedback ID: da00714a-1acb-4b0c-ab56-5d32ef68eb79

Errors

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extent analysis

TL;DR

Downgrade to opus 4.6 to potentially resolve the increased mistakes and hallucinations issue.

Guidance

  • The issue seems to be related to the version of opus, with 4.7 introducing more mistakes and hallucinations compared to 4.6.
  • Try downgrading to opus 4.6 to verify if the issue is resolved.
  • If downgrading is not feasible, consider reporting the issue to the opus developers with detailed examples of the mistakes and hallucinations.
  • Collect more information about the specific use case and configuration that triggers the issue.

Notes

The issue lacks detailed technical information, and the provided error log is empty, making it difficult to provide a more specific solution.

Recommendation

Apply workaround: Downgrade to opus 4.6, as it is reported to have fewer mistakes and hallucinations.

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#training loop#device allocation#model download#tokenizer error#prompt formatting

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