Cursor unstable keeping getting into summarizing chat context and planning mode loop

Support Bug Reports
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1

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

Keeping getting planning mode and chat summarizing loop issue, and things get stuck . Only one chat option and below is the network diagnostics setup

Steps to Reproduce

Keeping getting planning mode and chat summarizing loop issue, and things get stuck . Only one chat option and below is the network diagnostics setup

Screenshots / Screen Recordings

cursor ide bug.jpeg
cursor ide bug.jpeg768×397 31.2 KB

Operating System

Windows 10/11

Version Information

Version: 2.5.25 (user setup)
VSCode Version: 1.105.1
Commit: 7150844152b426ed50d2b68dd6b33b5c5beb73c0
Date: 2026-02-24T07:17:49.417Z
Build Type: Stable
Release Track: Default
Electron: 39.4.0
Chromium: 142.0.7444.265
Node.js: 22.22.0
V8: 14.2.231.22-electron.0
OS: Windows_NT x64 10.0.26200

For AI issues: which model did you use?

codex 5.3

Does this stop you from using Cursor

Yes - Cursor is unusable

3

Hey, thanks for the report. There are a few things worth trying and checking:

  1. Start a new chat: If the looping happens in a long conversation, the context might be too large. In a new chat, everything should work.
  2. Try disabling HTTP/2: Settings Ctrl + , > search for HTTP/2 > enable Disable HTTP/2, then restart Cursor.
  3. Temporarily try a different model: Switch from GPT-5.3 Codex Extra High to something like Claude Sonnet to see if the issue is model-specific.

Also, could you share:

  • a screenshot of the network diagnostics results (you mentioned this in the post, but the screenshot seems to only show the error dialog)
  • does this happen in every chat, or only after the conversation gets long?
  • are you using a VPN or a corporate proxy?

Let me know how it goes.