Grok 4 Fast Not Working Properly

Bug Reports
1

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

Grok 4 Fast (Thinking) can’t use tools properly and also hallucinating like Kimi K2(never respond correctly, always broken)

Steps to Reproduce

use Grok 4 Fast model

Screenshots / Screen Recordings

Screenshot_20251116_171223.png
Screenshot_20251116_171223.png723×1016 43.3 KB

Operating System

Linux

Current Cursor Version (Menu → About Cursor → Copy)

Version: 2.0.77
VSCode Version: 1.99.3
Commit: ba90f2f88e4911312761abab9492c42442117cf0
Date: 2025-11-13T23:10:43.113Z
Electron: 37.7.0
Chromium: 138.0.7204.251
Node.js: 22.20.0
V8: 13.8.258.32-electron.0
OS: Linux x64 6.17.7-300.fc43.x86_64

Does this stop you from using Cursor

No - Cursor works, but with this issue

2

Hey, thanks for the report. To help us understand the tool usage issues with Grok 4 Fast, please share:

  • Request ID: Chat menu (top right) > Copy Request ID for the failed request
  • Specific example: Which tool the model tried to use and what exactly went wrong
  • Restart check: Have you tried restarting Cursor and checking if the issue still happens?

This will help the team understand whether this is model-specific behavior or a bug that needs to be fixed.

3

This topic was automatically closed 22 days after the last reply. New replies are no longer allowed.