I'm confused, I work at a big giant Fortune 500, we all get GitHub Copilot subscriptionsn - we can switch between OpenAI and Anthropic models with just a click in Visual Studio. There's no stickiness at all. They just made us go through a training after the price hikes about how to choose between models for the best cost/benefit ratio.
GitHub Copilot is the sticky product in your org.
You can choose a selection of different models within it, but you're not using Codex or Claude Code.
We too use GH Copilot in our enterprise. OpenCode works flawlessly with GH Copilot subscription if you don't prefer VS Code.
Same here, except we just defaulted everyone to Auto and expect the percentage of tokens spent via the auto router to be high.
GitHub Copilot and Visual Studio are the sticky products for your company.
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.