Hey guys. Based on your experience for building outbound agents or cold callers, Is gpt 4o mini a good choice or should I go for gpt 4o? I've been testing multiple times with 4o mini and it hallucinates at some points when faced with back to back objections. Tried refining the prompt but it's kinda still there so I was just wondering if I should switch to 4o or not. Your feedbacks will be appreciated