Support response json format

api/src/main/java/com/launchableinc/openai/completion/chat/ChatCompletionRequest.java

@@ -27,6 +27,14 @@ public class ChatCompletionRequest {
 	 */
 	List<ChatMessage> messages;
 
+	/**
+	 * An object specifying the format that the model must output. Compatible with GPT-4 Turbo and all
+	 * GPT-3.5 Turbo models newer than gpt-3.5-turbo-1106.
+	 * https://platform.openai.com/docs/api-reference/chat/create#chat-create-response_format
+	 */
+	@JsonProperty("response_format")
+	ChatResponseFormat responseFormat;
+
 	/**
 	 * What sampling temperature to use, between 0 and 2. Higher values like 0.8 will make the output
 	 * more random, while lower values like 0.2 will make it more focused and deterministic.<br> We

api/src/main/java/com/launchableinc/openai/completion/chat/ChatResponseFormat.java

@@ -0,0 +1,31 @@
+package com.launchableinc.openai.completion.chat;
+
+import com.fasterxml.jackson.annotation.JsonValue;
+import lombok.Builder;
+import lombok.Data;
+
+/*
+ * OpenAI API Document:https://platform.openai.com/docs/api-reference/chat/create#chat-create-response_format
+ */
+@Data
+@Builder
+public class ChatResponseFormat {
+
+	private ResponseFormat type;
+
+	public enum ResponseFormat {
+		TEXT("text"), JSON("json_object");
+
+		private final String value;
+
+		ResponseFormat(String value) {
+			this.value = value;
+		}
+
+		@JsonValue
+		public String getValue() {
+			return value;
+		}
+	}
+
+}