diff --git a/litellm/proxy/custom_callbacks.py b/litellm/proxy/custom_callbacks.py
index f6e01f807c..9ad19822f0 100644
--- a/litellm/proxy/custom_callbacks.py
+++ b/litellm/proxy/custom_callbacks.py
@@ -57,17 +57,16 @@ async def async_on_succes_logger(kwargs, response_obj, start_time, end_time):
     print(f"On Async Success!")
     # log: key, user, model, prompt, response, tokens, cost
     print("\nOn Success")
-    ### Access kwargs passed to litellm.completion()
+    # Access kwargs passed to litellm.completion()
     model = kwargs.get("model", None)
     messages = kwargs.get("messages", None)
     user = kwargs.get("user", None)
 
-    #### Access litellm_params passed to litellm.completion(), example access `metadata`
+    # Access litellm_params passed to litellm.completion(), example access `metadata`
     litellm_params = kwargs.get("litellm_params", {})
     metadata = litellm_params.get("metadata", {})   # headers passed to LiteLLM proxy, can be found here
-    #################################################
 
-    ##### Calculate cost using  litellm.completion_cost() #######################
+    # Calculate cost using  litellm.completion_cost()
     cost = litellm.completion_cost(completion_response=response_obj)
     response = response_obj
     # tokens used in response 
@@ -86,4 +85,42 @@ async def async_on_succes_logger(kwargs, response_obj, start_time, end_time):
     )
     return
 
+
+async def async_on_fail_logger(kwargs, response_obj, start_time, end_time):
+    print(f"On Async Failure!")
+    print(kwargs)
+
+    # Access kwargs passed to litellm.completion()
+    model = kwargs.get("model", None)
+    messages = kwargs.get("messages", None)
+    user = kwargs.get("user", None)
+
+    # Access litellm_params passed to litellm.completion(), example access `metadata`
+    litellm_params = kwargs.get("litellm_params", {})
+    metadata = litellm_params.get("metadata", {})   # headers passed to LiteLLM proxy, can be found here
+
+    # Acess Exceptions & Traceback
+    exception_event = kwargs.get("exception", None)
+    traceback_event = kwargs.get("traceback_exception", None)
+
+    # Calculate cost using  litellm.completion_cost()
+    cost = litellm.completion_cost(completion_response=response_obj)
+    response = response_obj
+    # tokens used in response 
+    usage = response_obj.get("usage", {})
+
+    print(
+        f"""
+            Model: {model},
+            Messages: {messages},
+            User: {user},
+            Usage: {usage},
+            Cost: {cost},
+            Response: {response}
+            Proxy Metadata: {metadata}
+            Exception: {exception_event}
+            Traceback: {traceback_event}
+        """
+    )
+
 # litellm.success_callback = [async_on_succes_logger]
\ No newline at end of file