Microsoft just announced the availability of OpenAI GPT-5.5, which they are charging 30x for it. In contrast, they charge 7.5x for Claude Opus 4.6 and 1x for OpenAI GPT-5.4
Check out the token-based pricing, and compare GPT-5.5 with all other models.
https://docs.github.com/en/copilot/reference/copilot-billing...
If you're referring to the multipliers that are used for subscription-based usage, GPT 5.5 is not available yet (according to https://docs.github.com/en/copilot/reference/copilot-billing...) and Opus will be at 27x at the end of the month.
When I check GH Copilot right now, it looks like Opus 4.7 multiplier was increased to 15x (I think it was 6x just a few days ago) but 4.6 is still at 3x. But these relatively cheap multipliers exist only until the end of the month.