Can't use any agent model after update to 2.1.20

Bug Reports
1

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

After an update to Cursor Version 2.1.20,
I can’t sent a request to any of the models, normally it would be GPT-5.1 Codex High in Agent Mode (Plan and Ask mode have the same issue)
After sending I see: "Planning next moves“ and that’s it.
So it takes more or less 60 seconds and than it’s like I haven’t send a request
and I can sent it again.

Unfortunately there is no error message.

Did I miss something?

Steps to Reproduce

Sending a request to any model

Expected Behavior

The agents starts working

Operating System

MacOS

Current Cursor Version (Menu → About Cursor → Copy)

Version: 2.1.20 (Universal)
VSCode Version: 1.105.1
Commit: a8d8905b06c8da1739af6f789efd59c28ac2a680
Date: 2025-11-22T14:51:59.472Z (1 day ago)
Electron: 37.7.0
Chromium: 138.0.7204.251
Node.js: 22.20.0
V8: 13.8.258.32-electron.0
OS: Darwin x64 21.6.0

For AI issues: which model did you use?

I testet all available models

For AI issues: add Request ID with privacy disabled

There is none

Does this stop you from using Cursor

Yes - Cursor is unusable

2

Hey, thanks for the report. Before we dive into detailed diagnostics, let’s try a few basics:

Quick checks:

  • Create a new chat (CMD+I or click “+” in the chat panel). Does everything work in a fresh chat?
  • Open a different project or folder. Does the agent work there?
  • Press CMD+, → search “HTTP/2” → enable “Disable HTTP/2” → restart Cursor.

This will help us see whether the issue is specific to one project or more global. Let me know what you find.

3

Thanks for the fast approach:
New Chat doesn’t solved the problem.
But end Cursor (not only new start Cursor) switch to another project and then switch back did the trick!

Thank you so much!