Finally, the whole answer to why the price has increased 20 times is in this topic))
it turns out that the larger the chat window, the more the cost increases. And here is a simple hint that will take up 150 tokens will already be 1 million tokens and 3 dollars. And so on, the next one is already more than a million, 1.5 million. Then just the question “change this color to this” will already cost 5$
I asked how to disable these cached tokens, but so far no answer)