How much is GPT-4?

Excuse me, could you please elaborate on the pricing of GPT-4? I'm quite curious about its cost and whether it differs based on various factors like usage, subscription plans, or perhaps even the scale of the tasks it's being utilized for. Is there a standard pricing model, or does it vary depending on specific needs? Additionally, are there any discounts or promotional offers available for GPT-4? I'd appreciate any insights you could provide on this matter. Thank you in advance for your assistance.