The models are not what is being discussed here, it is the harnesses. That is, Claude Code, Codex, and what you use, GitHub Copilot. I suspect there would have to be strong reasons for your Fortune 500 company to switch away from Copilot.

Similarly, I have made no ground in arguing to try to get Codex at the company I work for, which got Claude Code a year ago and sees no reason to go through the whole process of setting up any alternatives when Claude Code already works and is at the frontier.