diff --git a/litellm/litellm_core_utils/redact_messages.py b/litellm/litellm_core_utils/redact_messages.py
index 25a2ce6672c..8180c803b28 100644
--- a/litellm/litellm_core_utils/redact_messages.py
+++ b/litellm/litellm_core_utils/redact_messages.py
@@ -168,9 +168,11 @@ def _redact_standard_logging_object(model_call_details: dict):
 # Input-bearing keys that show up in request-body snapshots
 # (proxy_server_request.body and additional_args.complete_input_dict).
 # "messages"/"prompt"/"input" are the OpenAI-style payload entry points;
+# "contents" is the Gemini/Vertex native user-turn field.
 # "system"/"system_prompt"/"instructions" are the provider-native top-level
-# system-prompt fields (Anthropic `system`, Responses API `instructions`),
-# which carry user content just as the messages do.
+# system-prompt fields (Anthropic `system`, Responses API `instructions`);
+# "system_instruction"/"systemInstruction" are the Gemini/Vertex equivalents.
+# All carry user content just as the messages do.
 def _redact_request_body_dict(body: dict):
     """Scrub the input/system-prompt keys on a materialised request-body dict."""
     if "messages" in body:
@@ -179,7 +181,17 @@ def _redact_request_body_dict(body: dict):
         body["prompt"] = ""
     if "input" in body:
         body["input"] = ""
-    for key in ("system", "system_prompt", "instructions"):
+    if "contents" in body:
+        body["contents"] = [
+            {"role": "user", "parts": [{"text": "redacted-by-litellm"}]}
+        ]
+    for key in (
+        "system",
+        "system_prompt",
+        "instructions",
+        "system_instruction",
+        "systemInstruction",
+    ):
         if key in body:
             body[key] = "redacted-by-litellm"
 
diff --git a/tests/test_litellm/litellm_core_utils/test_redact_messages.py b/tests/test_litellm/litellm_core_utils/test_redact_messages.py
index 63bfb9fa446..aedccb56fce 100644
--- a/tests/test_litellm/litellm_core_utils/test_redact_messages.py
+++ b/tests/test_litellm/litellm_core_utils/test_redact_messages.py
@@ -592,3 +592,67 @@ class TestPerformRedaction:
         assert cid["system"] == "redacted-by-litellm"
         assert cid["system_prompt"] == "redacted-by-litellm"
         assert cid["instructions"] == "redacted-by-litellm"
+
+    def test_redacts_gemini_native_fields_in_complete_input_dict(self):
+        """Gemini/Vertex wire-format requests carry the user turn in `contents`
+        and the system prompt in `system_instruction` / `systemInstruction`,
+        not the OpenAI-style `messages` / `system` keys — these provider-native
+        fields must be scrubbed from the wire-format request snapshot too."""
+        details = {
+            "additional_args": {
+                "complete_input_dict": {
+                    "model": "gemini-2.0-flash",
+                    "contents": [
+                        {
+                            "role": "user",
+                            "parts": [{"text": "CANARY_INPUT_should_be_redacted"}],
+                        }
+                    ],
+                    "system_instruction": {
+                        "parts": [{"text": "CANARY_SYSTEM_should_be_redacted"}]
+                    },
+                    "systemInstruction": {
+                        "parts": [{"text": "CANARY_SYSTEM_should_be_redacted"}]
+                    },
+                }
+            }
+        }
+
+        perform_redaction(details, None)
+
+        cid = details["additional_args"]["complete_input_dict"]
+        assert cid["contents"] == [
+            {"role": "user", "parts": [{"text": "redacted-by-litellm"}]}
+        ]
+        assert cid["system_instruction"] == "redacted-by-litellm"
+        assert cid["systemInstruction"] == "redacted-by-litellm"
+
+    def test_redacts_gemini_native_fields_in_proxy_server_request_body(self):
+        """Same Gemini/Vertex native input fields can also land in the proxy
+        body snapshot — `contents` / `system_instruction` must be scrubbed."""
+        details = {
+            "litellm_params": {
+                "proxy_server_request": {
+                    "body": {
+                        "model": "gemini-2.0-flash",
+                        "contents": [
+                            {
+                                "role": "user",
+                                "parts": [{"text": "CANARY_INPUT_should_be_redacted"}],
+                            }
+                        ],
+                        "system_instruction": {
+                            "parts": [{"text": "CANARY_SYSTEM_should_be_redacted"}]
+                        },
+                    }
+                }
+            },
+        }
+
+        perform_redaction(details, None)
+
+        body = details["litellm_params"]["proxy_server_request"]["body"]
+        assert body["contents"] == [
+            {"role": "user", "parts": [{"text": "redacted-by-litellm"}]}
+        ]
+        assert body["system_instruction"] == "redacted-by-litellm"