Not sure if im doing something wrong but the costs shown for Gemini Flash model differ from assistant to assistant that im creating. I just checked and one assistant is showing $.14 per minute and another is showing $.04 per minute, JUST FOR THE MODEL. is this normal?

Gemini 2.0 flash is a relatively inexpensive model, so it really depends on the other services that you are using in combination with Gemini that determines the total cost