Model Discrepancy: Selected claude-4-sonnet appears to be Claude 3.5 Sonnet

[qurore]

@IsaacHopkinson

Let me share an additional evidence.
Is it a hallucination that a Claude Sonnet 4 model responds with, “I’m actually Claude Sonnet 3.5, but I’m being told I’m Claude Sonnet 4 by the system prompt”?