Chatgpt.com website doesn't list the active model

When I access https://chatgpt.com/, I see this:

For a short time that drop-down listed options like ChatGPT4o so I could tell which model was being used, but that disappeared.

How do I tell which model is being used, without that option being displayed?

No responses? I can’t tell or choose which OpenAI model I’m using as the above screenshot from the OpenAI website no longer displays or allows selection of which OpenAI model to use.

For a few hours, a while back, it correctly displayed the model being used, but that quickly disappeared. The OpenAI website has been broken in this regard for weeks.