Some LLMs are not using apply_patch anymore

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1

I was using Opus 5.5 and Sonnet 5.5 today. They started using the apply patch command for a while, then avoided it by using Python code in the terminal.
This is an issue for reviewing code produced in the terminal because the IDE’s code changes feature doesn’t track it. Plus, I have no reconciliation flow to add those code changes back into the review.

Am I the only one having that behavior?

2

Hi there!

We detected that this may be a bug report, so we’ve moved your post to the Bug Reports category.

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Where does the bug appear (feature/product)?

  • Editor, Tab & Chat (autocomplete, Composer, in-editor agent)
  • Terminal & commands
  • Models, pricing & API keys (availability, Auto/Max, BYOK/Bedrock)
  • MCP & tools
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  • Cursor CLI
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Version Information

  • For Cursor IDE: Menu → About Cursor → Copy
  • For Cursor CLI: Run agent about in your terminal
IDE:
Version: 2.xx.x
VSCode Version: 1.105.1
Commit: ......

CLI:
CLI Version 2026.01.17-d239e66

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Does this stop you from using Cursor?

  • Yes - Cursor is unusable
  • Sometimes - I can sometimes use Cursor
  • No - Cursor works, but with this issue

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6

created a new bug report instead: LLM not using apply patch when generating code

So we can close this if you want