Large models have no issues with this question at all. Even llama-70B can handle it without issues, and that is a lot smaller than GPT-4o. But for small models this is a challenging question. llama-8B gets it confidently wrong 4 out of 5 times. gemma-2-9B gets it wrong pretty much every time. quen-coder-7B can handle it, so it's not impossible. It's just uncommon for small models to reliably get this question right, which is why I find it noteworthy that this model does.