The deprecation of GPT-4.5 makes me sad. It's an amazing model with great world-knowledge and subtly. It KNOWS THINGS that, on a quick experiment, 4.1 just does not. 4.5 could tell me what I would see from a random street corner in New Jersey, or how to use minor features of my niche API (well, almost), and it could write remarkably. But 4.1 doesn't hold a candle to it. Please, continue to charge me $150/1M tokens. Sometimes you need a Big Model. Tells me it was costing more than $150/1M to serve (!).