I wouldn’t take this as evidence this is Claude. This is an indirect manner of finding out which model it is, not a direct manner. The behavior of Code Supernove is pretty much identical to that of Grok Code, save the issue I mentioned above. Fundamentally, I do believe Claude Sonnet and Opus are superior coding models overall…except for their performance (the excruciatingly slow speed of them compared to Grok Code, for the cost, is insane.)
I think that generally speaking, that sentiment holds true across a majority of vibe coders and agent users. Since these models are trained on public information, its not surprising that a different model, would give you that response. Further, such a response is not always guaranteed, models are non-deterministic, and tomorrow you might very well get a different answer. 