diff --git a/backend/open_webui/utils/anthropic.py b/backend/open_webui/utils/anthropic.py
index 9e8bc54cf0..cd4a87fd9f 100644
--- a/backend/open_webui/utils/anthropic.py
+++ b/backend/open_webui/utils/anthropic.py
@@ -743,7 +743,7 @@ async def openai_stream_to_anthropic_stream(openai_stream_generator, model: str
             'stop_reason': stop_reason,
             'stop_sequence': None,
         },
-        'usage': {'output_tokens': output_tokens},
+        'usage': {'input_tokens': input_tokens, 'output_tokens': output_tokens},
     }
     yield f'event: message_delta\ndata: {json.dumps(message_delta)}\n\n'.encode()