Opinion The days when you could jump from one frontier AI model to another at the drop of a hat are going away as vendor lock-in starts to kick in, and prices increase. Once upon a time, say last month, people thought nothing of jumping from one AI frontier model to another. One week, the hottest AI model was Gemini 3.1 Pro, then it was Claude 4.6, now, maybe, it's GPT-5.5. Next month? Who knows. That's fine for Joe Amateur Programmer, but for Janet Pro Programmer, it's another story. You see, enterprise AI buyers face two converging problems. First, it's proving much harder to switch between AI vendors than people expected. At the same time, AI vendors are pushing through price increases that are reshaping software economics. We always knew this would happen. AI prices have been loss leaders for years now, and the bills are finally coming due.…