Any document to refer to cost comparison between completion API and chat completion API for turbo3.5K

Can anyone help me with cost comparison / differences between completion API and chat completion API. I am using Azure open ai gpt3.5K 16K model

In my chart, cost is per 1 million tokens so you can compare the prices more easily:

Model Training Input usage Output usage Context Length
GPT-3.5-turbo-base $n/a $1.50 $2.00 4k
GPT-3.5 Turbo fine-tune $8.00 $12.00 $16.00 4k
GPT-3.5-turbo-16k $n/a $3.00 $4.00 16k
GPT-4 $n/a $30.00 $60.00 8k
-------- ------------- ------------- ------------- -------------
babbage-002 base $n/a $0.40 $0.40 16k
babbage-002 fine-tune $0.40 $1.60 $1.60 16k
-------- ------------- ------------- ------------- -------------
davinci-002 base $n/a $2.00 $2.00 16k
davinci-002 fine-tune $6.00 $12.00 $12.00 16k
(text-davinci-003) (legacy) $20.00 $20.00 4k

The last two sections are completion models.