WebRTC gpt-4o-audio cost per minute of conversation?

I tried calculating this twice.

First time I got $0.30 cents per minute, second time I got $0.024.

Could someone be so kinda and help me out? I don’t want to get this wrong. I know openai said they cut down the costs by 80% recently, but I want to double check with the community, or anyone available and down to share their calculations