I think its just a visual/default thing, cause Opus 4.0 isn't offered on claude code anymore. And opus 4.7 is on their official docs as a model you can change to, on claude code

Just ask it what model it is(even in new chat).

what model are you?

I'm Claude Opus 4 (model ID: claude-opus-4-7).

https://support.claude.com/en/articles/11940350-claude-code-...