diff --git a/litellm/proxy/pass_through_endpoints/pass_through_endpoints.py b/litellm/proxy/pass_through_endpoints/pass_through_endpoints.py
index b9ab7526a..f34efdcf3 100644
--- a/litellm/proxy/pass_through_endpoints/pass_through_endpoints.py
+++ b/litellm/proxy/pass_through_endpoints/pass_through_endpoints.py
@@ -3,6 +3,7 @@ import asyncio
 import json
 import traceback
 from base64 import b64encode
+from datetime import datetime
 from typing import AsyncIterable, List, Optional
 
 import httpx
@@ -20,6 +21,7 @@ from fastapi.responses import StreamingResponse
 import litellm
 from litellm._logging import verbose_proxy_logger
 from litellm.integrations.custom_logger import CustomLogger
+from litellm.litellm_core_utils.litellm_logging import Logging as LiteLLMLoggingObj
 from litellm.proxy._types import (
     ConfigFieldInfo,
     ConfigFieldUpdate,
@@ -30,8 +32,12 @@ from litellm.proxy._types import (
 )
 from litellm.proxy.auth.user_api_key_auth import user_api_key_auth
 
+from .success_handler import PassThroughEndpointLogging
+
 router = APIRouter()
 
+pass_through_endpoint_logging = PassThroughEndpointLogging()
+
 
 async def set_env_variables_in_header(custom_headers: dict):
     """
@@ -330,7 +336,7 @@ async def pass_through_request(
         async_client = httpx.AsyncClient(timeout=600)
 
         # create logging object
-        start_time = time.time()
+        start_time = datetime.now()
         logging_obj = Logging(
             model="unknown",
             messages=[{"role": "user", "content": "no-message-pass-through-endpoint"}],
@@ -473,12 +479,15 @@ async def pass_through_request(
         content = await response.aread()
 
         ## LOG SUCCESS
-        end_time = time.time()
+        end_time = datetime.now()
 
-        await logging_obj.async_success_handler(
+        await pass_through_endpoint_logging.pass_through_async_success_handler(
+            httpx_response=response,
+            url_route=str(url),
             result="",
             start_time=start_time,
             end_time=end_time,
+            logging_obj=logging_obj,
             cache_hit=False,
         )
 
diff --git a/litellm/proxy/pass_through_endpoints/success_handler.py b/litellm/proxy/pass_through_endpoints/success_handler.py
new file mode 100644
index 000000000..618f68659
--- /dev/null
+++ b/litellm/proxy/pass_through_endpoints/success_handler.py
@@ -0,0 +1,105 @@
+import re
+from datetime import datetime
+
+import httpx
+
+import litellm
+from litellm.litellm_core_utils.litellm_logging import Logging as LiteLLMLoggingObj
+from litellm.llms.vertex_ai_and_google_ai_studio.gemini.vertex_and_google_ai_studio_gemini import (
+    VertexLLM,
+)
+from litellm.proxy.auth.user_api_key_auth import user_api_key_auth
+
+
+class PassThroughEndpointLogging:
+    def __init__(self):
+        self.TRACKED_VERTEX_ROUTES = [
+            "generateContent",
+            "streamGenerateContent",
+            "predict",
+        ]
+
+    async def pass_through_async_success_handler(
+        self,
+        httpx_response: httpx.Response,
+        logging_obj: LiteLLMLoggingObj,
+        url_route: str,
+        result: str,
+        start_time: datetime,
+        end_time: datetime,
+        cache_hit: bool,
+        **kwargs,
+    ):
+        if self.is_vertex_route(url_route):
+            await self.vertex_passthrough_handler(
+                httpx_response=httpx_response,
+                logging_obj=logging_obj,
+                url_route=url_route,
+                result=result,
+                start_time=start_time,
+                end_time=end_time,
+                cache_hit=cache_hit,
+                **kwargs,
+            )
+        else:
+            await logging_obj.async_success_handler(
+                result="",
+                start_time=start_time,
+                end_time=end_time,
+                cache_hit=False,
+            )
+
+    def is_vertex_route(self, url_route: str):
+        for route in self.TRACKED_VERTEX_ROUTES:
+            if route in url_route:
+                return True
+        return False
+
+    def extract_model_from_url(self, url: str) -> str:
+        pattern = r"/models/([^:]+)"
+        match = re.search(pattern, url)
+        if match:
+            return match.group(1)
+        return "unknown"
+
+    async def vertex_passthrough_handler(
+        self,
+        httpx_response: httpx.Response,
+        logging_obj: LiteLLMLoggingObj,
+        url_route: str,
+        result: str,
+        start_time: datetime,
+        end_time: datetime,
+        cache_hit: bool,
+        **kwargs,
+    ):
+        if "generateContent" in url_route:
+            model = self.extract_model_from_url(url_route)
+
+            instance_of_vertex_llm = VertexLLM()
+            litellm_model_response: litellm.ModelResponse = (
+                instance_of_vertex_llm._process_response(
+                    model=model,
+                    messages=[
+                        {"role": "user", "content": "no-message-pass-through-endpoint"}
+                    ],
+                    response=httpx_response,
+                    model_response=litellm.ModelResponse(),
+                    logging_obj=logging_obj,
+                    optional_params={},
+                    litellm_params={},
+                    api_key="",
+                    data={},
+                    print_verbose=litellm.print_verbose,
+                    encoding=None,
+                )
+            )
+            logging_obj.model = litellm_model_response.model
+            logging_obj.model_call_details["model"] = logging_obj.model
+
+            await logging_obj.async_success_handler(
+                result=litellm_model_response,
+                start_time=start_time,
+                end_time=end_time,
+                cache_hit=cache_hit,
+            )