When I run github copilot cli, the following models won't show up:

• gemini 2.5 pro
• grok code fast 1
• gpt-4o

In fact, even if I manually set:
set COPILOT_MODEL=grok-code-fast-1
prior to launching github copilot cli, it ignores it.

whereas those models do show up in the following places:

• Github Copilot integration Visual Studio 2022
• Github Copilot integration vscode
• https://github.com/copilot
• Even when OpenCode is configured to support GiHub Copilot

This isn't a problem perse, I'm just curious what the deal is.