I'm looking at their plans (https://github.com/features/copilot/plans) it seems like the limits might be pretty low, even with the Pro+ plan which is 2x the cost of Claude Pro. It seems like Claude Pro might be 10-20x the Opus tokens for only twice the price.
Copilot has a totally different billing model. It's request based rather than token based. Counter-intuitively, in our case at least, it is way cheaper than token based pricing. One request can sometimes consume 2-4 million tokens but is billed as a single request (or it's multiplier if using a premium model like opus).