Bug Report – Unable to Switch Back to o3 After Using Canvas Mode

ChatGPT Bugs
1

Hi everyone,

I’ve encountered a frustrating issue with ChatGPT’s Canvas Mode that I wanted to bring to attention.

Issue:

After initiating a Canvas Mode session to edit a document, I found that I was unable to switch back to o3 for further interactions. No matter what I tried, the UI wouldn’t allow me to change models once a canvas session was active.

Steps to Reproduce:

  1. Start a chat using o3.
  2. Open a Canvas Mode document and begin editing.
  3. Attempt to switch back to o3 for normal conversation after finishing with the canvas.
  4. The model selection remains locked, preventing me from switching back.

What I Tried:

  • Refreshing the page :white_check_mark: (Did not resolve the issue)
  • Clearing cache and cookies :white_check_mark: (Did not resolve the issue)
  • Opening a new chat :white_check_mark: (o3 was available again, but I lost the ongoing conversation context)
  • Checking account settings :white_check_mark: (No options available to unlock model selection)
2

I recently encountered a similar issue when trying to use o1 after a web search. While not ideal, you can use the same workaround for your issue as well:

Try manually setting the model query parameter to o3-mini in the page URL.

For example,

  • If your chat URL is https://chatgpt.com/c/abcdefghijklmnop
  • Add the query param: https://chatgpt.com/c/abcdefghijklmnop?model=o3-mini

After the page loads, the o3 model you specified should be selected and usable (but still greyed out in the model selector).

I’m not sure if this workaround has any unintended consequences yet. For now I just assume it doesn’t.

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