From my experience with their Plus plan GPT 4 usually just times out no matter what the prompt, forcing me to revert to 3.5. I'm not sure why I haven't asked for a refund yet.
Plus, you can always use Bing Chat. It’s more locked down, but depending on what you’re doing, it’s pretty good and backed by GPT-4.
As for Bing, despite the claims that it is GPT-4, it's clearly inferior to what OpenAI is offering. It's probably an older iteration of the model, and I wonder if it might also be a scaled-down version to run it cheaper at scale.
As for Bing? Who knows what's going on behind the scenes. I've read that the "Creative" mode uses GPT-4 while the others might use a faster model, but that may well be nonsense.
As for Bing, I don't know what's behind the scenes, but it does noticeably worse on tasks in "Creative" mode than ChatGPT backend in GPT-4 mode, in my limited experiments. For example, try this:
> A is 1m left of B, B is 1m above C, D is 1m right of C, E is 1m below D, and E is 1m right of F. Where is F located relative to C?
GPT-4 can usually solve this correctly. Bing is usually wrong even when it tries to solve it step by step (and it often won't unless you prompt it).