Custom GPT: “Content failed to load” when switching models

Update:

I think I figured out what’s going on.

• If I turn Actions OFF , everything works

• If I turn Actions ON , the model selector crashes (“Content failed to load”)

This happens across multiple GPTs, not just one.

Support said Actions GPTs are supposed to only work with GPT-4o / GPT-4.1 , but those don’t show up in the dropdown anymore — I only see GPT-5.x and o3.

So it seems like:

• Actions expects older models

• Those models aren’t selectable anymore

• New models aren’t supported → UI breaks

Also seeing this in console:

TypeError: f.models.get is not a function

Separately, I’ve also been seeing inconsistent behavior with Actions actually executing (even before this), so wouldn’t be surprised if GPT-5.x just isn’t fully compatible with Actions yet.

For now, only workaround is turning Actions off.

Curious if anyone else is seeing the same thing.