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claude-code - 💡(How to fix) Fix [BUG] huge performance drop in claude opus 4.6 [1 comments, 2 participants]

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anthropics/claude-code#46240•Fetched 2026-04-11 06:25:28
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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?

Claude performance dropped massive on the x20 plan. can't even distinct between localhost and production url anymore.

What Should Happen?

Should work with same performance as before.

Error Messages/Logs

Steps to Reproduce

run claude code

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

No response

Claude Code Version

2.1.92

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

No response

extent analysis

TL;DR

The performance issue with Claude Code on the x20 plan may be related to a regression in version 2.1.92, and checking the release notes or downgrading to a previous version could help resolve the issue.

Guidance

  • Verify the performance difference between localhost and production URLs to isolate the issue.
  • Check the release notes for version 2.1.92 to see if any changes could be causing the performance drop.
  • Try downgrading to a previous version of Claude Code to see if the issue persists.
  • Test the performance with a different Claude model to determine if the issue is model-specific.

Example

No code snippet is provided as the issue does not include specific code-related details.

Notes

The lack of information about the last working version and additional details makes it challenging to provide a more specific solution. The guidance provided is based on the assumption that the issue is related to the regression in version 2.1.92.

Recommendation

Apply workaround: Downgrade to a previous version of Claude Code, as the current version (2.1.92) is suspected to be the cause of the performance issue, and the last working version is not specified.

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claude-code - 💡(How to fix) Fix [BUG] huge performance drop in claude opus 4.6 [1 comments, 2 participants]