diff --git a/foundation-models/openai/src/main/java/com/sap/ai/sdk/foundationmodels/openai/model/OpenAiChatCompletionOutput.java b/foundation-models/openai/src/main/java/com/sap/ai/sdk/foundationmodels/openai/model/OpenAiChatCompletionOutput.java
index a43bf802..86861d62 100644
--- a/foundation-models/openai/src/main/java/com/sap/ai/sdk/foundationmodels/openai/model/OpenAiChatCompletionOutput.java
+++ b/foundation-models/openai/src/main/java/com/sap/ai/sdk/foundationmodels/openai/model/OpenAiChatCompletionOutput.java
@@ -28,7 +28,12 @@ public class OpenAiChatCompletionOutput extends OpenAiCompletionOutput
   @Getter(onMethod_ = @Nonnull)
   private String systemFingerprint;
 
-  void addDelta(OpenAiDeltaChatCompletion delta) {
+  /**
+   * Add a streamed delta to the total output.
+   *
+   * @param delta the delta to add.
+   */
+  public void addDelta(OpenAiDeltaChatCompletion delta) {
 
     if (delta.getSystemFingerprint() != null) {
       systemFingerprint = delta.getSystemFingerprint();