claude-code - 💡(How to fix) Fix [MODEL] Opus 4.6 Hallucinations [1 comments, 2 participants]

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anthropics/claude-code#45491Fetched 2026-04-09 08:04:11
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Preflight Checklist

  • I have searched existing issues for similar behavior reports
  • This report does NOT contain sensitive information (API keys, passwords, etc.)

Type of Behavior Issue

Other unexpected behavior

What You Asked Claude to Do

I asked it to start the dev server for the website im building

What Claude Actually Did

It failed to start the server and looped repeatedly until giving up

<img width="1920" height="1080" alt="Image" src="https://github.com/user-attachments/assets/b9d49e85-c309-4e05-a1ba-546525795cc7" /> <img width="1920" height="1080" alt="Image" src="https://github.com/user-attachments/assets/169163b8-6504-40ee-b297-e87cf90f8698" /> <img width="1920" height="1080" alt="Image" src="https://github.com/user-attachments/assets/fa77d79c-b361-4e13-8cab-239e5e87fb2e" />

Expected Behavior

just started the dev server

Files Affected

Permission Mode

Accept Edits was ON (auto-accepting changes)

Can You Reproduce This?

Haven't tried to reproduce

Steps to Reproduce

No response

Claude Model

Opus

Relevant Conversation

Impact

Medium - Extra work to undo changes

Claude Code Version

v2.1.97

Platform

Anthropic API

Additional Context

No response

extent analysis

TL;DR

Investigate and resolve potential configuration or dependency issues that may be causing the dev server to fail and loop repeatedly.

Guidance

  • Review the project's configuration files and dependencies to ensure they are correctly set up and compatible with the current version of Claude Code (v2.1.97).
  • Check the Anthropic API documentation to verify that the API is properly configured and that there are no known issues with the Opus model that could be causing the problem.
  • Attempt to reproduce the issue with a minimal example to isolate the cause and provide more detailed steps to reproduce.
  • Consider resetting or reinitializing the project's configuration to a known good state to see if that resolves the issue.

Example

No specific code example can be provided without more information about the project's configuration and code.

Notes

The lack of detailed steps to reproduce and additional context makes it difficult to provide a more specific solution. Further investigation and debugging are needed to determine the root cause of the issue.

Recommendation

Apply workaround: Try resetting the project's configuration and dependencies to a known good state and see if that resolves the issue. This is a safe and minimal approach to try and resolve the issue without making significant changes.

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