Was it Grok 4 Fast by chance?

I was dealing with something similar with it yesterday. No code involved. It was giving me factually incorrect information about a multiple schools and school districts. I told it it was wrong multiple times and it hallucinated school names even. Had the school district in the wrong county entirely. It kept telling me I was wrong and that although it sounded like the answer it gave me, it in fact was correct. Frustrated, I switched to Expert, had it re-verify all the facts, and then it spit out factually correct information.

That's the flip side of the same symptom. One model is instructed to agree with the user no matter what, and the other is instructed to stick to its guns no matter what. Neither of them is actually thinking.

There was a time when we'd have said you were talking to a sociopath.