diff --git a/open-ai-examples/src/main/java/OpenAiObservabilityExamples.java b/open-ai-examples/src/main/java/OpenAiObservabilityExamples.java
index 6865403..00061e1 100644
--- a/open-ai-examples/src/main/java/OpenAiObservabilityExamples.java
+++ b/open-ai-examples/src/main/java/OpenAiObservabilityExamples.java
@@ -1,11 +1,24 @@
+import dev.langchain4j.data.message.AiMessage;
+import dev.langchain4j.data.message.ChatMessage;
 import dev.langchain4j.model.chat.ChatLanguageModel;
-import dev.langchain4j.model.chat.listener.*;
+import dev.langchain4j.model.chat.listener.ChatModelErrorContext;
+import dev.langchain4j.model.chat.listener.ChatModelListener;
+import dev.langchain4j.model.chat.listener.ChatModelRequestContext;
+import dev.langchain4j.model.chat.listener.ChatModelResponseContext;
+import dev.langchain4j.model.chat.request.ChatRequest;
+import dev.langchain4j.model.chat.request.ChatRequestParameters;
+import dev.langchain4j.model.chat.response.ChatResponse;
+import dev.langchain4j.model.chat.response.ChatResponseMetadata;
 import dev.langchain4j.model.openai.OpenAiChatModel;
+import dev.langchain4j.model.openai.OpenAiChatRequestParameters;
+import dev.langchain4j.model.openai.OpenAiChatResponseMetadata;
+import dev.langchain4j.model.openai.OpenAiTokenUsage;
+import dev.langchain4j.model.output.TokenUsage;
 
+import java.util.List;
 import java.util.Map;
 
 import static dev.langchain4j.model.openai.OpenAiChatModelName.GPT_4_O_MINI;
-import static java.util.Collections.singletonList;
 
 public class OpenAiObservabilityExamples {
 
@@ -13,37 +26,98 @@ static class Observe_OpenAiChatModel {
 
         public static void main(String[] args) {
 
-            ChatModelListener modelListener = new ChatModelListener() {
+            ChatModelListener listener = new ChatModelListener() {
 
                 @Override
                 public void onRequest(ChatModelRequestContext requestContext) {
-                    ChatModelRequest request = requestContext.request();
+                    ChatRequest chatRequest = requestContext.chatRequest();
+
+                    List<ChatMessage> messages = chatRequest.messages();
+                    System.out.println(messages);
+
+                    ChatRequestParameters parameters = chatRequest.parameters();
+                    System.out.println(parameters.modelName());
+                    System.out.println(parameters.temperature());
+                    System.out.println(parameters.topP());
+                    System.out.println(parameters.topK());
+                    System.out.println(parameters.frequencyPenalty());
+                    System.out.println(parameters.presencePenalty());
+                    System.out.println(parameters.maxOutputTokens());
+                    System.out.println(parameters.stopSequences());
+                    System.out.println(parameters.toolSpecifications());
+                    System.out.println(parameters.toolChoice());
+                    System.out.println(parameters.responseFormat());
+
+                    if (parameters instanceof OpenAiChatRequestParameters openAiParameters) {
+                        System.out.println(openAiParameters.maxCompletionTokens());
+                        System.out.println(openAiParameters.logitBias());
+                        System.out.println(openAiParameters.parallelToolCalls());
+                        System.out.println(openAiParameters.seed());
+                        System.out.println(openAiParameters.user());
+                        System.out.println(openAiParameters.store());
+                        System.out.println(openAiParameters.metadata());
+                        System.out.println(openAiParameters.serviceTier());
+                        System.out.println(openAiParameters.reasoningEffort());
+                    }
+
                     Map<Object, Object> attributes = requestContext.attributes();
+                    attributes.put("my-attribute", "my-value");
                 }
 
                 @Override
                 public void onResponse(ChatModelResponseContext responseContext) {
-                    ChatModelResponse response = responseContext.response();
-                    ChatModelRequest request = responseContext.request();
+                    ChatResponse chatResponse = responseContext.chatResponse();
+
+                    AiMessage aiMessage = chatResponse.aiMessage();
+                    System.out.println(aiMessage);
+
+                    ChatResponseMetadata metadata = chatResponse.metadata();
+                    System.out.println(metadata.id());
+                    System.out.println(metadata.modelName());
+                    System.out.println(metadata.finishReason());
+
+                    if (metadata instanceof OpenAiChatResponseMetadata openAiMetadata) {
+                        System.out.println(openAiMetadata.created());
+                        System.out.println(openAiMetadata.serviceTier());
+                        System.out.println(openAiMetadata.systemFingerprint());
+                    }
+
+                    TokenUsage tokenUsage = metadata.tokenUsage();
+                    System.out.println(tokenUsage.inputTokenCount());
+                    System.out.println(tokenUsage.outputTokenCount());
+                    System.out.println(tokenUsage.totalTokenCount());
+                    if (tokenUsage instanceof OpenAiTokenUsage openAiTokenUsage) {
+                        System.out.println(openAiTokenUsage.inputTokensDetails().cachedTokens());
+                        System.out.println(openAiTokenUsage.outputTokensDetails().reasoningTokens());
+                    }
+
+                    ChatRequest chatRequest = responseContext.chatRequest();
+                    System.out.println(chatRequest);
+
                     Map<Object, Object> attributes = responseContext.attributes();
+                    System.out.println(attributes.get("my-attribute"));
                 }
 
                 @Override
                 public void onError(ChatModelErrorContext errorContext) {
                     Throwable error = errorContext.error();
-                    ChatModelRequest request = errorContext.request();
-                    ChatModelResponse partialResponse = errorContext.partialResponse();
+                    error.printStackTrace();
+
+                    ChatRequest chatRequest = errorContext.chatRequest();
+                    System.out.println(chatRequest);
+
                     Map<Object, Object> attributes = errorContext.attributes();
+                    System.out.println(attributes.get("my-attribute"));
                 }
             };
 
-            ChatLanguageModel chatModel = OpenAiChatModel.builder()
-                    .apiKey("demo")
+            ChatLanguageModel model = OpenAiChatModel.builder()
+                    .apiKey(System.getenv("OPENAI_API_KEY"))
                     .modelName(GPT_4_O_MINI)
-                    .listeners(singletonList(modelListener))
+                    .listeners(List.of(listener))
                     .build();
 
-            chatModel.chat("Tell me a joke about Java");
+            model.chat("Tell me a joke about Java");
         }
     }
 }