API version when using ChatGPT (3.5 turbo and 4-turbo) with python OpenAI module

I was using ChatGPT for text generation by means of the python library OpenAI. I passed the model and the key as outlined in the API documentation. Could you please advise how to get the API version used ? The contents of this variable is “None”. Please note that I do not use Azure. In the API documentation I find only parameters to define the model but not to pass OpenAi.api_version for calling a request via API. I assume the variable OpenAI.api_version is only defined for Azure. Is my assumption correct ?

It had been defined for Azure.
Using OpenAI’s servers, there is no api_version variable.