Because if you’re a vscode user up until a couple days ago you could hammer Opus 4.6 all day every day and pay nowhere close to the Claude Max plan. Many people exploited this and the subsidy is closing.
The Qwen models are cool, but if you're coming from Opus you will be somewhere between mildly to very disappointed depending on the complexity of your work.
On wait, nevermind.
Usage limits are/were higher in Copilot. They also charge per prompt, not per token.
It is basically a token based pricing, but you get alos a limitation of prompts (you can't just randomly ask questions to models, you have to optimize to make them do the most work for e.g. hour(s) without you replying - or ask them to use the question tool).