What is the best ChatGPT model to use on make.com?

Hey everyone, I am currently creating a voice agent on Vapi that books appointments. I am stuck with this problem. When I use any chat GPT 4.1 it is coming up with dates like June the 5th 2024. The Chat GPT 5 gives the correct date and time but seems like it is not the best model for Vapi because it is hard to match the prompt. Any advice or tips would be much appreciated. Many thanks.