diff --git a/app/services/grok/processer.py b/app/services/grok/processer.py
index 4eeb5b9..a2a8fe9 100644
--- a/app/services/grok/processer.py
+++ b/app/services/grok/processer.py
@@ -154,7 +154,7 @@ class GrokResponseProcessor:
                 created=int(time.time()),
                 model=model or "grok-4-mini-thinking-tahoe",
                 choices=[OpenAIChatCompletionChunkChoice(
-                    index=chunk_index,
+                    index=0,
                     delta=OpenAIChatCompletionChunkMessage(
                         role="assistant",
                         content=content
@@ -431,4 +431,4 @@ class GrokResponseProcessor:
                 finish_reason="stop"
             )],
             usage=None
-        )
\ No newline at end of file
+        )