If it's just daily chatting or writing copy, you can use whichever is most convenient.

But if you're doing media creation, coding, running workflows, integrating APIs, building knowledge bases, or developing AI tools, you can't just look at the model's popularity.
What you really need to consider are three things:
Price, stability, and after-sales support.
Because AI services are not a one-time purchase.
Later on, you'll encounter issues like quotas, APIs, model switching, call failures, and cost control.
So today, instead of discussing mystical experiences, let's start with the API prices on the official website.
1. First, look at the GPT official API prices.
Using OpenAI's publicly available API prices as a reference, the price for GPT-5.5 is approximately:
If roughly calculated at 1 USD ≈ 7.2 RMB:
Using GPT-5.4 would be a bit cheaper:
Converted to RMB, approximately: