Opus 4.6 writing code in plan mode

Support Bug Reports
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1

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

opus writing code in plan mode

Steps to Reproduce

idk use opus and be in plan mode after you have implemented a previous plan (same chat)

Expected Behavior

go back into plan mode

Operating System

MacOS

Version Information

Version: 3.1.0-pre.5.patch.0
VSCode Version: 1.105.1
Commit: 0196591c6cf647fc9ec356e97a3b0f01d74dc2d0
Date: 2026-04-05T01:55:32.858Z
Layout: glass
Build Type: Stable
Release Track: Nightly
Electron: 39.8.1
Chromium: 142.0.7444.265
Node.js: 22.22.1
V8: 14.2.231.22-electron.0
OS: Darwin arm64 25.5.0

For AI issues: which model did you use?

Opus 4.6 1M High

For AI issues: add Request ID with privacy disabled

19e99204-afd1-49a2-a7cd-fdfddd5599fd

Does this stop you from using Cursor

No - Cursor works, but with this issue

5

Hi Panos,

This is still the same known issue from your earlier thread, where deanrie confirmed it and suggested the .cursor/rules workaround. The team is tracking it.

Were you able to set up the rule file @deanrie suggested? If so, and the model is still ignoring it, that’s a useful data point. Starting a fresh chat when you switch back to plan mode (rather than continuing the same conversation after implementing) also tends to help, since the large prior context makes it more likely that the model drifts into agent behavior.