Plan mode + Opus 4.5 get stuck in eternal loops

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

So this is pretty severe actually since it’s “the core product”.

In plan mode, I get stuck in loops between “Flutter analyze” → Chat summarized → Checking last thing on the todo → Flutter analyze.

This way, the plan never gets really finished.

Steps to Reproduce

How to reproduce bug:
Make sure Opus 4.5 is selected as model.
When I create a plan → Click “Build” → Let it do it’s thing → The model get stucks in “Running Flutter analyze” and then doing "Chat context summarized → Checking last thing on the TODO → Doing Flutter analyze → “Chat context summarized” → Checking last thing on the TODO → Doinf Flutter analyze.

I have to quit this manually every time and it costs me so extremely much money. For some reason it fills upp the context window for every loop.

Expected Behavior

When there’s no errors in Flutter analyze → Check the last bullet on the plan/todo. Don’t do “chat summarized” and restart the loop.

Operating System

MacOS

Current Cursor Version (Menu → About Cursor → Copy)

Version: 2.2.20 (Universal)
VSCode Version: 1.105.1
Commit: b3573281c4775bfc6bba466bf6563d3d498d1070
Date: 2025-12-12T06:29:26.017Z
Electron: 37.7.0
Chromium: 138.0.7204.251
Node.js: 22.20.0
V8: 13.8.258.32-electron.0
OS: Darwin arm64 24.5.0

For AI issues: which model did you use?

Opus 4.5

Does this stop you from using Cursor

Sometimes - I can sometimes use Cursor

Hey there Henrik,

Could you share a Request ID with Privacy Mode disabled? That way we can have a beter look.

Best regards,

Colin

Hi!

Ok sure, here it is:

f75aa24e-80dd-4069-98a8-779b10f4aefb

Sent you a PM!

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