Where does the bug appear (feature/product)?
Cursor IDE
Describe the Bug
When using Auto mode in Agent or Ask chat, the thinking/reasoning output displays garbled multilingual text (Chinese characters, random English words, placeholder strings) and loops indefinitely without producing a response.
Snippet of some of the output:
Peer<|uniquepaddingtoken75|>悲伤 KotaBHminorMS噪ilarlyrasiStrategicConditions спра typeof substantial spectatorsLibrary课时 vitaೂ<｜place▁holder▁no▁717｜> uitgegeven HUMANrh=-\透过 Vecported寡妇 rationalления<｜place▁holder▁no▁541｜> idealized
–Snip–
Steps to Reproduce
Open a new Agent chat
Set the model selector to Auto
Send any message (even a simple one like “test”)
The “Thinking” section expands and fills with garbled text that never resolves
Expected Behavior
Auto mode should select a model, process the thinking internally (hidden or properly formatted), and return a normal response.
Actual Behavior: The thinking output shows nonsensical text mixing Chinese characters, random English words, and placeholder-like strings (e.g. place_holder_no_30, ECORequestMappinggraphs, UEFA). It loops indefinitely and never produces a usable response.
Key Detail: Every model works correctly when selected manually. The bug only occurs when Auto selects the model.
Screenshots / Screen Recordings
Operating System
Windows 10/11
Version Information
Version: 2.6.19 (system setup)
VSCode Version: 1.105.1
Commit: 224838f96445be37e3db643a163a817c15b36060
Date: 2026-03-12T04:07:27.435Z
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 10.0.19045
For AI issues: which model did you use?
Auto
Additional Information
I tried restarting cursor as well as my computer, switched VPNs to see if that would do anything, issue still persists.
Does this stop you from using Cursor
Sometimes - I can sometimes use Cursor