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.
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.
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.