In what scenarios do you need this feature?

Want to use GPT4 instead of GPT 3.5 Turbo

Describe the optimal solution

req := gogpt.ChatCompletionRequest{
Model: gogpt.GPT3Dot5Turbo,
MaxTokens: maxTokens,
Messages: reqMsgs,
}

In above code, allow Model to be chosen from below list of Models

const (
GPT432K0314 = "gpt-4-32k-0314"
GPT432K = "gpt-4-32k"
GPT40314 = "gpt-4-0314"
GPT4 = "gpt-4"
GPT3Dot5Turbo0301 = "gpt-3.5-turbo-0301"
GPT3Dot5Turbo = "gpt-3.5-turbo"
GPT3TextDavinci003 = "text-davinci-003"
GPT3TextDavinci002 = "text-davinci-002"
GPT3TextCurie001 = "text-curie-001"
GPT3TextBabbage001 = "text-babbage-001"
GPT3TextAda001 = "text-ada-001"
GPT3TextDavinci001 = "text-davinci-001"
GPT3DavinciInstructBeta = "davinci-instruct-beta"
GPT3Davinci = "davinci"
GPT3CurieInstructBeta = "curie-instruct-beta"
GPT3Curie = "curie"
GPT3Ada = "ada"
GPT3Babbage = "babbage"
)

Describe the candidate solution

No response

Other information

No response