I agree that the new UX is confusing and ill-designed.

A UI is supposed to help the user develop a mental model for what's happening under the covers. But what's happening when you switch from ChatGPT Work to ChatGPT Codex? If I switch it while in an existing session, nothing seems to happen. Does that mean it did nothing? If so, why let the user switch it at all.

When I switch it in the new conversation state, the help text changes from "What should we build?" to "What should we get done?". As near as I can tell, the switch gives me access to different sets of tools. But does that mean that some tools are not available in both modes? Why? Why not let the agent access all tools and pick the one based on context? Why are you forcing me to choose up front? And what happens if I choose poorly?

I get that OpenAI is moving fast, but I feels like a single round of usability testing might have helped.