How to calculate cost of Assistant call

API
1

I am trying to figure out what a call to my assistant costs. From the completed event, I can get the usage:

Usage: {
  prompt_tokens: 1661,
  completion_tokens: 37,
  total_tokens: 1698,
  prompt_token_details: { cached_tokens: 0 }
}

I am using model gpt-4o-mini-2024-07-18 right now, which has the following cost according to the pricing page:

  • $0.150 / 1M input tokens
  • $0.075 / 1M cached** input tokens
  • $0.600 / 1M output tokens

I am confused by the difference in terminology. Are prompt tokens input tokens? Are completion tokens output tokens? Or is there additional math involved in getting the price of the call?