diff --git a/lib/new_relic/agent/llm/chat_completion_message.rb b/lib/new_relic/agent/llm/chat_completion_message.rb
index c678be9565..a60e654e55 100644
--- a/lib/new_relic/agent/llm/chat_completion_message.rb
+++ b/lib/new_relic/agent/llm/chat_completion_message.rb
@@ -6,7 +6,8 @@ module NewRelic
   module Agent
     module Llm
       class ChatCompletionMessage < LlmEvent
-        ATTRIBUTES = %i[content role sequence token_count is_response]
+        ATTRIBUTES = %i[content role sequence completion_id token_count
+          is_response]
         EVENT_NAME = 'LlmChatCompletionMessage'
 
         attr_accessor(*ATTRIBUTES)
diff --git a/test/new_relic/agent/llm/chat_completion_message_test.rb b/test/new_relic/agent/llm/chat_completion_message_test.rb
index 85eb809982..443a8d82f8 100644
--- a/test/new_relic/agent/llm/chat_completion_message_test.rb
+++ b/test/new_relic/agent/llm/chat_completion_message_test.rb
@@ -54,6 +54,7 @@ def test_record_creates_an_event
         message.response_model = 'gpt-4'
         message.vendor = 'OpenAI'
         message.role = 'system'
+        message.completion_id = 123
         message.is_response = 'true'
         message.token_count = 10
 
@@ -73,6 +74,7 @@ def test_record_creates_an_event
         assert_equal 'Red-Tailed Hawk', attributes['content']
         assert_equal 'system', attributes['role']
         assert_equal 2, attributes['sequence']
+        assert_equal 123, attributes['completion_id']
         assert_equal 'true', attributes['is_response']
         assert_equal 10, attributes['token_count']
       end