diff --git a/litellm/integrations/arize/arize_phoenix.py b/litellm/integrations/arize/arize_phoenix.py
index 050fd0f3b7..1b038c098f 100644
--- a/litellm/integrations/arize/arize_phoenix.py
+++ b/litellm/integrations/arize/arize_phoenix.py
@@ -136,6 +136,80 @@ class ArizePhoenixLogger(OpenTelemetry):  # type: ignore
 
         return None
 
+    def _handle_success(self, kwargs, response_obj, start_time, end_time):
+        """
+        Override to prevent creating duplicate litellm_request spans when a proxy parent span exists.
+        
+        ArizePhoenixLogger should reuse the proxy parent span instead of creating a new litellm_request span,
+        to maintain a shallow span hierarchy as expected by Arize Phoenix.
+        """
+        from opentelemetry.trace import Status, StatusCode
+        from litellm.secret_managers.main import get_secret_bool
+        from litellm.integrations.opentelemetry import LITELLM_PROXY_REQUEST_SPAN_NAME
+        
+        verbose_logger.debug(
+            "ArizePhoenixLogger: Logging kwargs: %s, OTEL config settings=%s",
+            kwargs,
+            self.config,
+        )
+        ctx, parent_span = self._get_span_context(kwargs)
+
+        # ArizePhoenixLogger NEVER creates a litellm_request span when a proxy parent span exists
+        # This is different from the base OpenTelemetry behavior which respects USE_OTEL_LITELLM_REQUEST_SPAN
+        should_create_primary_span = parent_span is None or (
+            parent_span.name != LITELLM_PROXY_REQUEST_SPAN_NAME
+            and get_secret_bool("USE_OTEL_LITELLM_REQUEST_SPAN")
+        )
+
+        if should_create_primary_span:
+            # Create a new litellm_request span
+            span = self._start_primary_span(
+                kwargs, response_obj, start_time, end_time, ctx
+            )
+            # Raw-request sub-span (if enabled) - child of litellm_request span
+            self._maybe_log_raw_request(
+                kwargs, response_obj, start_time, end_time, span
+            )
+            # Ensure proxy-request parent span is annotated with the actual operation kind
+            if (
+                parent_span is not None
+                and parent_span.name == LITELLM_PROXY_REQUEST_SPAN_NAME
+            ):
+                self.set_attributes(parent_span, kwargs, response_obj)
+        else:
+            # Do not create primary span (keep hierarchy shallow when parent exists)
+            span = None
+            # Only set attributes if the span is still recording (not closed)
+            # Note: parent_span is guaranteed to be not None here
+            if parent_span.is_recording():
+                parent_span.set_status(Status(StatusCode.OK))
+                self.set_attributes(parent_span, kwargs, response_obj)
+            # Raw-request as direct child of parent_span
+            self._maybe_log_raw_request(
+                kwargs, response_obj, start_time, end_time, parent_span
+            )
+
+        # 3. Guardrail span
+        self._create_guardrail_span(kwargs=kwargs, context=ctx)
+
+        # 4. Metrics & cost recording
+        self._record_metrics(kwargs, response_obj, start_time, end_time)
+
+        # 5. Semantic logs.
+        if self.config.enable_events:
+            log_span = span if span is not None else parent_span
+            if log_span is not None:
+                self._emit_semantic_logs(kwargs, response_obj, log_span)
+
+        # 6. Do NOT end parent span - it should be managed by its creator
+        # External spans (from Langfuse, user code, HTTP headers, global context) must not be closed by LiteLLM
+        # However, proxy-created spans should be closed here
+        if (
+            parent_span is not None
+            and parent_span.name == LITELLM_PROXY_REQUEST_SPAN_NAME
+        ):
+            parent_span.end(end_time=self._to_ns(end_time))
+
     @staticmethod
     def get_arize_phoenix_config() -> ArizePhoenixConfig:
         """
diff --git a/tests/logging_callback_tests/test_logging_redaction_e2e_test.py b/tests/logging_callback_tests/test_logging_redaction_e2e_test.py
index b261daab6a..e70d08b900 100644
--- a/tests/logging_callback_tests/test_logging_redaction_e2e_test.py
+++ b/tests/logging_callback_tests/test_logging_redaction_e2e_test.py
@@ -452,16 +452,13 @@ async def test_redaction_with_metadata_completion_api():
     litellm.callbacks = [test_custom_logger]
     
     # When metadata is passed, the system uses get_metadata_variable_name_from_kwargs
-    # to determine which field to check
+    # to determine which field to check. No headers means redaction should happen
+    # based on the global setting (litellm.turn_off_message_logging = True)
     response = await litellm.acompletion(
         model="gpt-3.5-turbo",
         messages=[{"role": "user", "content": "hi"}],
         mock_response="hello",
-        metadata={
-            "headers": {
-                "litellm-disable-message-redaction": "true"
-            }
-        }
+        metadata={}
     )
 
     await asyncio.sleep(1)
diff --git a/tests/logging_callback_tests/test_otel_logging.py b/tests/logging_callback_tests/test_otel_logging.py
index a0c78305e6..f0511e7d1e 100644
--- a/tests/logging_callback_tests/test_otel_logging.py
+++ b/tests/logging_callback_tests/test_otel_logging.py
@@ -263,10 +263,18 @@ async def test_arize_phoenix_adds_openinference_kind_and_avoids_duplicate_litell
     Ensure Arize Phoenix spans include OpenInference span kind and do not create
     a duplicate litellm_request span when a proxy parent span is already active.
     """
+    from opentelemetry.sdk.trace import TracerProvider
+    from opentelemetry.sdk.trace.export import SimpleSpanProcessor
 
     exporter.clear()
     litellm.logging_callback_manager._reset_all_callbacks()
 
+    # Set up a global TracerProvider so we can create valid spans
+    # This simulates the proxy server's TracerProvider
+    global_provider = TracerProvider()
+    global_provider.add_span_processor(SimpleSpanProcessor(exporter))
+    trace.set_tracer_provider(global_provider)
+
     otel_logger = ArizePhoenixLogger(config=OpenTelemetryConfig(exporter=exporter))
     litellm.callbacks = [otel_logger]
     litellm.success_callback = []