claude-code - 💡(How to fix) Fix [BUG] ClaudeCode is rambling nonsense to the point where it's completely useless for getting anything done. [1 comments, 2 participants]

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anthropics/claude-code#48340Fetched 2026-04-16 07:02:37
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Preflight Checklist

  • I have searched existing issues and this hasn't been reported yet
  • This is a single bug report (please file separate reports for different bugs)
  • I am using the latest version of Claude Code

What's Wrong?

ClaudeCode is rambling nonsense to the point where it's completely useless for getting anything done.

What Should Happen?

I used the exact same prompt, and Codex nailed the core issue immediately. Meanwhile, ClaudeCode just completely misses the point—rambling nonsense, zero logical flow. Honestly feels dumber than Opus or Sonnet 4.5.

Error Messages/Logs

Steps to Reproduce

...

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

No response

Claude Code Version

v2.1.109

Platform

Anthropic API

Operating System

Ubuntu/Debian Linux

Terminal/Shell

WSL (Windows Subsystem for Linux)

Additional Information

No response

extent analysis

TL;DR

The issue may be resolved by checking the input prompt and comparing it with the one used in Codex to identify any differences that could be causing ClaudeCode to produce rambling nonsense.

Guidance

  • Review the prompt used in ClaudeCode and compare it with the one used in Codex to identify any differences that could be contributing to the issue.
  • Verify that the input prompt is well-structured and clear, as this may affect the output of ClaudeCode.
  • Consider testing the same prompt in a different version of ClaudeCode, such as the last known working version, to see if the issue is specific to version v2.1.109.
  • Check the documentation for the Anthropic API and ClaudeCode to see if there are any known issues or limitations that could be contributing to the problem.

Notes

The issue lacks specific details about the input prompt and the expected output, making it difficult to provide a more targeted solution. Additionally, the fact that the issue is reported as a regression suggests that the problem may be related to a change in the ClaudeCode model or the Anthropic API.

Recommendation

Apply workaround: Since the issue is reported as a regression and the last working version is not specified, it may be helpful to try a different version of ClaudeCode or to experiment with different input prompts to see if the issue can be mitigated.

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