Critical Bug: Cannot Switch Models After Using O3 – Error When Switching

[scupit]

Same here. The issue occurs with o4-mini as well. Here’s some additional context and a stack trace (essentially the same as your info):

Unable to use other models after o3 or o4-mini make a tool call

Describe the Bug After o3 or o4-mini execute a file Read tool call, I am unable to use other models for the duration of the chat. o3 and o4-mini still work, but all other models (including GPT 4.1) fail with the error message “We’re having trouble connecting to the model provider. This might be temporary - please try again in a moment.”. Steps to Reproduce Create a new cursor chat. Switch model to either o3 or o4-mini. Make a request which results in an autonomous file Read. For example, “Rea…