Describe the Bug
After starting a conversation with OpenAI O3 or Anthropic models such as Claude 3.5 or Claude 4, and using built-in tools during that session, it becomes impossible to switch to OpenAI GPT-4.1 within the same conversation.
Similarly, use Kimi, it is not possible to switch back to any Anthropic model afterward.
This behavior appears consistently and affects workflow flexibility.
Steps to Reproduce
Start a conversation with O3 or Claude 3.5 / Claude 4.
Use one or more of Cursor’s tools
Attempt to switch the model to OpenAI GPT-4.1
OR
use with the Kimi model.
Attempt to switch to an Anthropic model (Claude 3.5 / Claude 4)
Expected Behavior
It should be possible to switch between all supported models at any point in the conversation, regardless of which tools were used.
Many workflows benefit from starting with a lightweight or cheaper model (e.g., Kimi 4.1) and then switching to a more advanced model ( Claude) for deeper processing.
Operating System
Windows 10/11
Current Cursor Version (Menu → About Cursor → Copy)
Version: 1.3.2 (user setup)
VSCode Version: 1.99.3
Commit: 7db9f9f3f612efbde8f318c1a7951aa0926fc1d0
Date: 2025-07-24T22:25:04.483Z
Electron: 34.5.1
Chromium: 132.0.6834.210
Node.js: 20.19.0
V8: 13.2.152.41-electron.0
OS: Windows_NT x64 10.0.19045
Additional Information
Please fix all the models to match each other, I don’t have the strength to report another model that does this every time.
While this issue does not make Cursor completely unusable, it prevents efficient model switching, which in turn causes significant financial loss — for example, by forcing me to use expensive models for simple tasks instead of switching temporarily to cheaper ones.
Does this stop you from using Cursor
No - Cursor works, but with this issue