diff --git a/bundles/org.openhab.binding.chatgpt/src/main/java/org/openhab/binding/chatgpt/internal/ChatGPTChannelConfiguration.java b/bundles/org.openhab.binding.chatgpt/src/main/java/org/openhab/binding/chatgpt/internal/ChatGPTChannelConfiguration.java
index c25aeaf98..26e904263 100644
--- a/bundles/org.openhab.binding.chatgpt/src/main/java/org/openhab/binding/chatgpt/internal/ChatGPTChannelConfiguration.java
+++ b/bundles/org.openhab.binding.chatgpt/src/main/java/org/openhab/binding/chatgpt/internal/ChatGPTChannelConfiguration.java
@@ -22,11 +22,11 @@ import org.eclipse.jdt.annotation.NonNullByDefault;
 @NonNullByDefault
 public class ChatGPTChannelConfiguration {
 
-    public String model = "";
+    public String model = "gpt-3.5-turbo";
 
-    public float temperature;
+    public float temperature = 0.5f;
 
     public String systemMessage = "";
 
-    int maxTokens;
+    int maxTokens = 500;
 }
diff --git a/bundles/org.openhab.binding.chatgpt/src/main/java/org/openhab/binding/chatgpt/internal/ChatGPTHandler.java b/bundles/org.openhab.binding.chatgpt/src/main/java/org/openhab/binding/chatgpt/internal/ChatGPTHandler.java
index 62f4e5920..e39b1bc11 100644
--- a/bundles/org.openhab.binding.chatgpt/src/main/java/org/openhab/binding/chatgpt/internal/ChatGPTHandler.java
+++ b/bundles/org.openhab.binding.chatgpt/src/main/java/org/openhab/binding/chatgpt/internal/ChatGPTHandler.java
@@ -122,9 +122,11 @@ public class ChatGPTHandler extends BaseThingHandler {
         messages.add(userMessage);
         root.add("messages", messages);
 
+        String queryJson = gson.toJson(root);
         Request request = httpClient.newRequest(OPENAI_API_URL).method(HttpMethod.POST)
                 .header("Content-Type", "application/json").header("Authorization", "Bearer " + apiKey)
-                .content(new StringContentProvider(gson.toJson(root)));
+                .content(new StringContentProvider(queryJson));
+        logger.trace("Query '{}'", queryJson);
         try {
             ContentResponse response = request.send();
             updateStatus(ThingStatus.ONLINE);