Where does the bug appear (feature/product)?
Cursor IDE
Describe the Bug
When using Auto mode in the Agent/Chat, the model gets stuck in the “Thinking” phase and never finishes. The thinking area shows long, incoherent text (mixed languages, random characters) that has nothing to do with the question. The request never completes and no real answer is returned. The issue is account-specific: the same Cursor install works normally after switching to another account, and choosing a fixed model (e.g. Sonnet 4.6) instead of Auto also works. So the problem appears to be with the model selected by Auto (likely claude-3-7-sonnet with extended thinking) for this account only. Clearing cache and reinstalling Cursor did not fix it; changing network and proxy did not fix it; browser-based AI chat works fine.
Steps to Reproduce
1.Log in with the affected account in Cursor.
2.Open Chat/Composer and set the model to Auto.
3.Send any simple message (e.g. “Hello”).
4.Observe: the reply stays in “Thinking”, shows garbled multilingual text, and never completes.
Switch to another account (or change model to e.g. Sonnet 4.6) and repeat; behavior is normal.
Expected Behavior
Thinking should finish within a few seconds and the model should return a normal, readable answer, same as on other accounts or when using a fixed model like Sonnet 4.6.
Screenshots / Screen Recordings
Operating System
Windows 10/11
Version Information
Version: 2.6.20 (user setup)
VSCode Version: 1.105.1
Commit: b29eb4ee5f9f6d1cb2afbc09070198d3ea6ad760
Date: 2026-03-17T01:50:02.404Z
Build Type: Stable
Release Track: Default
Electron: 39.8.1
Chromium: 142.0.7444.265
Node.js: 22.22.1
V8: 14.2.231.22-electron.0
OS: Windows_NT x64 10.0.19042
Does this stop you from using Cursor
No - Cursor works, but with this issue