If you have a pro subscription, every month starting today OpenAI will give you $200 or $500 API credits (here). Anthropic does the same if you have Max (here). This is the lab's way of getting you used to how much inferences really cost (with a margin of 85% of them) and explaining that inferences of $15,000 a month for $200 were years of sweet, nostalgic youth that will never return.