Add configurable model option to AI chat

- Added 'model' field to chatOptions struct
- Replaced hardcoded model with aiChat.options.model
- Added command line flag for model selection

aichat.go

@@ -16,6 +16,7 @@ import (
 )
 
 type chatOptions struct {
+	model        string
 	temperature  float32
 	maxTokens    int
 	nonStreaming bool
@@ -87,7 +88,7 @@ func (aiChat *AIChat) stdChatLoop() error {
 		})
 		fmt.Print("assistant: ")
 		request := gogpt.ChatCompletionRequest{
-			Model:       gogpt.GPT3Dot5Turbo,
+			Model:       aiChat.options.model,
 			Messages:    messages,
 			Temperature: aiChat.options.temperature,
 			MaxTokens:   aiChat.options.maxTokens,
@@ -143,7 +144,7 @@ func (aiChat *AIChat) fold(prompt *Prompt, input string) error {
 	firstInput := aiChat.encoder.Decode(firstEncoded)
 	temperature := firstNonZeroFloat32(aiChat.options.temperature, prompt.Temperature)
 	firstRequest := gogpt.ChatCompletionRequest{
-		Model:       gogpt.GPT3Dot5Turbo,
+		Model:       aiChat.options.model,
 		Messages:    prompt.CreateMessages(firstInput),
 		Temperature: temperature,
 	}
@@ -183,7 +184,7 @@ func (aiChat *AIChat) fold(prompt *Prompt, input string) error {
 		}
 		input := aiChat.encoder.Decode(encoded[idx:nextIdx])
 		request := gogpt.ChatCompletionRequest{
-			Model:       gogpt.GPT3Dot5Turbo,
+			Model:       aiChat.options.model,
 			Messages:    prompt.CreateSubsequentMessages(output, input),
 			Temperature: temperature,
 		}
@@ -214,12 +215,14 @@ func main() {
 	var listPrompts = false
 	var nonStreaming = false
 	var split = false
+	var model = gogpt.GPT3Dot5Turbo
 	getopt.FlagLong(&temperature, "temperature", 't', "temperature")
 	getopt.FlagLong(&maxTokens, "max-tokens", 'm', "max tokens, 0 to use default")
 	getopt.FlagLong(&verbose, "verbose", 'v', "verbose output")
 	getopt.FlagLong(&listPrompts, "list-prompts", 'l', "list prompts")
 	getopt.FlagLong(&nonStreaming, "non-streaming", 0, "non streaming mode")
 	getopt.FlagLong(&split, "split", 0, "split input")
+	getopt.FlagLong(&model, "model", 0, "model")
 	getopt.Parse()
 
 	if listPrompts {
@@ -234,6 +237,7 @@ func main() {
 		log.Fatal(err)
 	}
 	options := chatOptions{
+		model:        model,
 		temperature:  temperature,
 		maxTokens:    maxTokens,
 		nonStreaming: nonStreaming,
@@ -303,7 +307,7 @@ func main() {
 		for _, messages := range messagesSlice {
 
 			request := gogpt.ChatCompletionRequest{
-				Model:       gogpt.GPT3Dot5Turbo,
+				Model:       model,
 				Messages:    messages,
 				Temperature: firstNonZeroFloat32(prompt.Temperature, aiChat.options.temperature),
 				MaxTokens:   maxTokens,