The 'omitempty' option of the request structs should be removed. This is because it generates an incorrect request when a parameter is 0. For example, a request with the temperate field set to '0' will actually return a response as if the field had been set to one. This is because the go JSON parser does not differentiate between a 0 value and no value for float32, so Openai will receive a request without a temperate field which then defaults to a temperature value of 1.