fix(pass-through): use logging_obj fallback for passthrough_logging_payload in non-streaming paths

passthrough_logging_payload is a named parameter of pass_through_async_success_handler
and is therefore consumed from **kwargs before reaching provider handlers.
All non-streaming kwargs.get('passthrough_logging_payload') calls returned None,
making _apply_spend_logs_metadata a no-op on every non-streaming path.

Fix: add logging_obj.model_call_details.get('passthrough_logging_payload') fallback
in base, anthropic, cohere, openai (first path), gemini, and vertex handlers.
The streaming path already uses _seed_streaming_kwargs_from_logging_obj which
reads from the same logging_obj.model_call_details source.

litellm/proxy/pass_through_endpoints/llm_provider_handlers/anthropic_passthrough_logging_handler.py

@@ -147,6 +147,7 @@ class AnthropicPassthroughLoggingHandler:
             kwargs["model"] = model
             passthrough_logging_payload: Optional[PassthroughStandardLoggingPayload] = (  # type: ignore
                 kwargs.get("passthrough_logging_payload")
+                or logging_obj.model_call_details.get("passthrough_logging_payload")
             )
             if passthrough_logging_payload:
                 user = AnthropicPassthroughLoggingHandler._get_user_from_metadata(

litellm/proxy/pass_through_endpoints/llm_provider_handlers/base_passthrough_logging_handler.py

@@ -161,6 +161,7 @@ class BasePassthroughLoggingHandler(ABC):
             kwargs["model"] = model
             passthrough_logging_payload: Optional[PassthroughStandardLoggingPayload] = (  # type: ignore
                 kwargs.get("passthrough_logging_payload")
+                or logging_obj.model_call_details.get("passthrough_logging_payload")
             )
             if passthrough_logging_payload:
                 user = self._get_user_from_metadata(

litellm/proxy/pass_through_endpoints/llm_provider_handlers/cohere_passthrough_logging_handler.py

@@ -131,7 +131,10 @@ class CoherePassthroughLoggingHandler(BasePassthroughLoggingHandler):
                 # Extract user information for tracking
                 passthrough_logging_payload: Optional[
                     PassthroughStandardLoggingPayload
-                ] = kwargs.get("passthrough_logging_payload")
+                ] = (
+                    kwargs.get("passthrough_logging_payload")
+                    or logging_obj.model_call_details.get("passthrough_logging_payload")
+                )
                 if passthrough_logging_payload:
                     user = handler_instance._get_user_from_metadata(
                         passthrough_logging_payload=passthrough_logging_payload,

litellm/proxy/pass_through_endpoints/llm_provider_handlers/gemini_passthrough_logging_handler.py

@@ -250,7 +250,9 @@ class GeminiPassthroughLoggingHandler:
 
         from .base_passthrough_logging_handler import BasePassthroughLoggingHandler  # noqa: PLC0415
         BasePassthroughLoggingHandler._apply_spend_logs_metadata(
-            kwargs, kwargs.get("passthrough_logging_payload")
+            kwargs,
+            kwargs.get("passthrough_logging_payload")
+            or logging_obj.model_call_details.get("passthrough_logging_payload"),
         )
 
         # pretty print standard logging object

litellm/proxy/pass_through_endpoints/llm_provider_handlers/openai_passthrough_logging_handler.py

@@ -369,7 +369,10 @@ class OpenAIPassthroughLoggingHandler(BasePassthroughLoggingHandler):
             # Extract user information for tracking
             passthrough_logging_payload: Optional[
                 PassthroughStandardLoggingPayload
-            ] = kwargs.get("passthrough_logging_payload")
+            ] = (
+                kwargs.get("passthrough_logging_payload")
+                or logging_obj.model_call_details.get("passthrough_logging_payload")
+            )
             if passthrough_logging_payload:
                 user = handler_instance._get_user_from_metadata(
                     passthrough_logging_payload=passthrough_logging_payload,

litellm/proxy/pass_through_endpoints/llm_provider_handlers/vertex_passthrough_logging_handler.py

@@ -554,7 +554,9 @@ class VertexPassthroughLoggingHandler:
 
         from litellm.proxy.pass_through_endpoints.llm_provider_handlers.base_passthrough_logging_handler import BasePassthroughLoggingHandler  # noqa: PLC0415
         BasePassthroughLoggingHandler._apply_spend_logs_metadata(
-            kwargs, kwargs.get("passthrough_logging_payload")
+            kwargs,
+            kwargs.get("passthrough_logging_payload")
+            or logging_obj.model_call_details.get("passthrough_logging_payload"),
         )
 
         # pretty print standard logging object