gpt4 won't know anything about gpt5, you would have to make a sophisticated prompt for gpt4 that converts its quirks into gpt5's quirks, but if you know so much about both LLMs, why not to use gpt5 directly?

The idea is someone would first make a prompt for GPT4 that outputs GPT5 enabled prompts. You would initialize GPT4 with it, and then speak to GPT4 to compile prompts to GPT5 context which then gets fed to GPT5.

Although you may know about LLMs, you might specialize in speaking to specific models and know how to get optimal results based on their nuances.