With their latest functions update to the API it seems the logic is simply passing methods to call the API via JSON to a trained model and it predicts which fun

With their latest functions update to the API it seems the logic is simply passing methods to call the API via JSON to a trained model and it predicts which function is best to call for the info, then OpenAI does the call for ChatGPT, then feeds the resulting Json back to ChatGPT which uses it to give an answer.