Added environment variable to select different OpenAI models. #34
+16
−2
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Added an environment variable to specify the OpenAI model that shall be used.
Adding this to the central place makes it easier to switch between different models (e.g., for cost reason or to adapt to newly released models in the future).
It also allows to experiment with different models.
As a side-effect, I have added to load the API key from the .env file explicitly.
This did not work properly on my Windows 10 based system.