feat(openai): Add OpenAI GPT-4.1 models to the OpenAiApi.ChatModel

Signed-off-by: Alexandros Pappas <apappascs@gmail.com>

Author: apappascs

models/spring-ai-openai/src/main/java/org/springframework/ai/openai/api/OpenAiApi.java

@@ -475,7 +475,33 @@ public enum ChatModel implements ChatModelDescription {
 		 * Context window: 4,096 tokens. Max output tokens: 4,096 tokens. Knowledge
 		 * cutoff: September, 2021.
 		 */
-		GPT_3_5_TURBO_INSTRUCT("gpt-3.5-turbo-instruct");
+		GPT_3_5_TURBO_INSTRUCT("gpt-3.5-turbo-instruct"),
+
+		/**
+		 * <b>GPT-4.1</b> is the flagship model for complex tasks. It is well suited for
+		 * problem solving across domains.
+		 * <p>
+		 * Context window: 1,047,576 tokens. Max output tokens: 32,768 tokens. Knowledge
+		 * cutoff: June 1, 2024.
+		 */
+		GPT_4_1("gpt-4.1"),
+
+		/**
+		 * <b>GPT-4.1-mini</b> provides a balance between intelligence, speed, and cost
+		 * that makes it an attractive model for many use cases.
+		 * <p>
+		 * Context window: 1,047,576 tokens. Max output tokens: 32,768 tokens. Knowledge
+		 * cutoff: June 1, 2024.
+		 */
+		GPT_4_1_MINI("gpt-4.1-mini"),
+
+		/**
+		 * <b>GPT-4.1-nano</b> is the fastest, most cost-effective GPT-4.1 model.
+		 * <p>
+		 * Context window: 1,047,576 tokens. Max output tokens: 32,768 tokens. Knowledge
+		 * cutoff: June 1, 2024.
+		 */
+		GPT_4_1_NANO("gpt-4.1-nano");
 
 		public final String value;