"explain" feature non-functional when using `codex-mini-latest` model

What version of Codex is running?

0.1.2505161243

Which model were you using?

codex-mini-latest

What platform is your computer?

Darwin 24.3.0 x86_64 i386

What steps can reproduce the bug?

1. ask codex to generate a patch
2. press x

What is the expected behavior?

the model explains the issue

What do you see instead?

<img width="850" alt="Image" src="https://github.com/user-attachments/assets/a999f271-3f5f-49ba-b80c-38e023461249" />

Additional information

Probably shouldn't have options listed to ping the chat endpoint if it's not available for this model.