On using token_dict to capture token count

Short Course Q&A Building Systems with the ChatGPT API
1

The video on using the ChatGPT API showed returning the token count using this line of code:
token_dict = {‘prompt_tokens’:response[‘usage’][‘prompt_tokens’],
‘completion_tokens’:response[‘usage’][‘completion_tokens’],
‘total_tokens’:response[‘usage’][‘total_tokens’],}

Am I right in thinking that ['prompt_tokens], [‘completion_tokens’] and [‘total_tokens’] are defined within the GPT API?

2

Not accurate. Only the response to the prompt has corresponding keys.