diff --git a/libraries-llms/src/test/java/com/baeldung/langchain/ChainWithDocumentLiveTest.java b/libraries-llms/src/test/java/com/baeldung/langchain/ChainWithDocumentLiveTest.java
index eec7da99fd..39746ce810 100644
--- a/libraries-llms/src/test/java/com/baeldung/langchain/ChainWithDocumentLiveTest.java
+++ b/libraries-llms/src/test/java/com/baeldung/langchain/ChainWithDocumentLiveTest.java
@@ -45,7 +45,7 @@ public class ChainWithDocumentLiveTest {
         ingestor.ingest(document);
 
         ChatLanguageModel chatModel = OpenAiChatModel.builder()
-            .apiKey(Constants.OPEN_AI_KEY)
+            .apiKey(Constants.OPENAI_API_KEY)
             .timeout(ofSeconds(60))
             .build();
 
diff --git a/libraries-llms/src/test/java/com/baeldung/langchain/ChatWithDocumentLiveTest.java b/libraries-llms/src/test/java/com/baeldung/langchain/ChatWithDocumentLiveTest.java
index cbbcc7dd23..41540f4888 100644
--- a/libraries-llms/src/test/java/com/baeldung/langchain/ChatWithDocumentLiveTest.java
+++ b/libraries-llms/src/test/java/com/baeldung/langchain/ChatWithDocumentLiveTest.java
@@ -68,7 +68,7 @@ public class ChatWithDocumentLiveTest {
 
         Prompt prompt = promptTemplate.apply(variables);
         ChatLanguageModel chatModel = OpenAiChatModel.builder()
-            .apiKey(Constants.OPEN_AI_KEY)
+            .apiKey(Constants.OPENAI_API_KEY)
             .timeout(ofSeconds(60))
             .build();
         AiMessage aiMessage = chatModel.generate(prompt.toUserMessage())
diff --git a/libraries-llms/src/test/java/com/baeldung/langchain/ChatWithMemoryLiveTest.java b/libraries-llms/src/test/java/com/baeldung/langchain/ChatWithMemoryLiveTest.java
index 7a67c0be0e..3d265d3f3f 100644
--- a/libraries-llms/src/test/java/com/baeldung/langchain/ChatWithMemoryLiveTest.java
+++ b/libraries-llms/src/test/java/com/baeldung/langchain/ChatWithMemoryLiveTest.java
@@ -22,7 +22,7 @@ public class ChatWithMemoryLiveTest {
 
     @Test
     public void givenMemory_whenPrompted_thenValidResponse() {
-        ChatLanguageModel model = OpenAiChatModel.withApiKey(Constants.OPEN_AI_KEY);
+        ChatLanguageModel model = OpenAiChatModel.withApiKey(Constants.OPENAI_API_KEY);
         ChatMemory chatMemory = TokenWindowChatMemory.withMaxTokens(300, new OpenAiTokenizer(GPT_3_5_TURBO));
 
         chatMemory.add(userMessage("Hello, my name is Kumar"));
diff --git a/libraries-llms/src/test/java/com/baeldung/langchain/Constants.java b/libraries-llms/src/test/java/com/baeldung/langchain/Constants.java
index b468b3a065..380415bf9c 100644
--- a/libraries-llms/src/test/java/com/baeldung/langchain/Constants.java
+++ b/libraries-llms/src/test/java/com/baeldung/langchain/Constants.java
@@ -7,6 +7,6 @@ public class Constants {
      * registering for free at (https://platform.openai.com/signup) and then by navigating
      * to "Create new secret key" page at (https://platform.openai.com/account/api-keys).
      */
-    public static String OPEN_AI_KEY = "demo"; //"<OPEN_AI_KEY>";
+    public static String OPENAI_API_KEY = "<OPENAI_API_KEY>";
 
 }
diff --git a/libraries-llms/src/test/java/com/baeldung/langchain/PromptTemplatesLiveTest.java b/libraries-llms/src/test/java/com/baeldung/langchain/PromptTemplatesLiveTest.java
index b05727f15f..cd2ea642ed 100644
--- a/libraries-llms/src/test/java/com/baeldung/langchain/PromptTemplatesLiveTest.java
+++ b/libraries-llms/src/test/java/com/baeldung/langchain/PromptTemplatesLiveTest.java
@@ -28,7 +28,7 @@ public class PromptTemplatesLiveTest {
         Prompt prompt = promptTemplate.apply(variables);
 
         ChatLanguageModel model = OpenAiChatModel.builder()
-            .apiKey(Constants.OPEN_AI_KEY)
+            .apiKey(Constants.OPENAI_API_KEY)
             .modelName(GPT_3_5_TURBO)
             .temperature(0.3)
             .build();
diff --git a/libraries-llms/src/test/java/com/baeldung/langchain/ServiceWithToolsLiveTest.java b/libraries-llms/src/test/java/com/baeldung/langchain/ServiceWithToolsLiveTest.java
index 1df08e6d35..7ebfcba4df 100644
--- a/libraries-llms/src/test/java/com/baeldung/langchain/ServiceWithToolsLiveTest.java
+++ b/libraries-llms/src/test/java/com/baeldung/langchain/ServiceWithToolsLiveTest.java
@@ -34,7 +34,7 @@ public class ServiceWithToolsLiveTest {
     @Test
     public void givenServiceWithTools_whenPrompted_thenValidResponse() {
         Assistant assistant = AiServices.builder(Assistant.class)
-            .chatLanguageModel(OpenAiChatModel.withApiKey(Constants.OPEN_AI_KEY))
+            .chatLanguageModel(OpenAiChatModel.withApiKey(Constants.OPENAI_API_KEY))
             .tools(new Calculator())
             .chatMemory(MessageWindowChatMemory.withMaxMessages(10))
             .build();