7.5 is promotional rate, it will go up to 25. And in May you will be switched to per token billing.

Opus 4.5 and 4.6 will be removed very soon.

So what is your contingency plan?

Microsoft are going to be removing Opus 4.5 and 4.6 from Copilot soon so I'd enjoy the lower cost while it lasts.

Manage the budget not the impl. Top down decisions like "use a cheap model" risk optimize for the wrong things. If we lose 90% cache hit on the expensive models to context switch to a cheap one, there's no savings. Set the budget, let the devs optimize.

in copilot I find it hard to justify using opus at even 3x vs just using GPT 5.4 high at 1x

I don't know how you guys are not seeing 4.7 as an upgrade, it just does so much more, so much better. I guess lower complexity tasks are saturated though.