Automatic switch to Grok 4.5 when clicking 'build' in Plan Mode

[zhang_kevin]

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

When using the ‘plan’ mode, after the plan is generated and I click ‘build’, it automatically switches to Grok 4.5 to execute. Is this the expected behavior or a bug?

Steps to Reproduce

When using the ‘plan’ mode, after the plan is generated and I click ‘build’, it automatically switches to Grok 4.5 to execute. Is this the expected behavior or a bug?

Operating System

MacOS

Version Information

Version: 3.12.17 (Universal)
VS Code Extension API: 1.128.0
Commit: 0fb762053c34788bb7760d5673f8a6d4c8589d50
Date: 2026-07-17T02:53:53.006Z
Layout: IDE
Build Type: Stable
Release Track: Default
Electron: 40.10.3
Chromium: 144.0.7559.236
Node.js: 24.15.0
V8: 14.4.258.32-electron.0
xterm.js: 6.1.0-beta.256
OS: Darwin x64 24.5.0

For AI issues: which model did you use?

Opus 4.8

For AI issues: add Request ID with privacy disabled

requestId: 736e53b1-04b2-4950-af09-17b06f339172

Does this stop you from using Cursor

No - Cursor works, but with this issue

[Colin]

Hey @zhang_kevin!

When viewing your plan, you should see a model in the upper right. This model should be respected when you click Build. Is it possibly set to a different model than you expect?

[zhang_kevin]

Hi Colin,
It showed “opus4.8” at first, but the moment I clicked “build”, it instantly changed to “grok4.5”. This isn’t what I wanted—I expected the implementation process to run on “opus4.8” too.

[Hasan_Salim_Kanmaz]

Seems like there is a general bug (?) with Grok 4.5. Now, my default model is switched to Grok 4.5 whenever I start a conversation. I am used to composer 2.5 and don’t want to use Grok for every task while composer is sufficient.