diff --git a/litellm/integrations/custom_logger.py b/litellm/integrations/custom_logger.py
index d4162369a35..0d281961774 100644
--- a/litellm/integrations/custom_logger.py
+++ b/litellm/integrations/custom_logger.py
@@ -940,20 +940,11 @@ class CustomLogger:  # https://docs.litellm.ai/docs/observability/custom_callbac
                 response: Final = standard_logging_object_copy["response"]
                 # Check if this is a ResponsesAPIResponse (has "output" field)
                 if isinstance(response, dict) and "output" in response:
-                    # Make a copy to avoid modifying the original
-                    from copy import deepcopy
+                    from litellm.litellm_core_utils.redact_messages import redacted_standard_logging_payload
 
-                    response_copy: Final = deepcopy(response)
-                    # Redact content in output array
-                    if isinstance(response_copy.get("output"), list):
-                        for output_item in response_copy["output"]:
-                            if isinstance(output_item, dict) and "content" in output_item:
-                                if isinstance(output_item["content"], list):
-                                    # Redact text in content items
-                                    for content_item in output_item["content"]:
-                                        if isinstance(content_item, dict) and "text" in content_item:
-                                            content_item["text"] = redacted_str
-                    standard_logging_object_copy["response"] = response_copy
+                    standard_logging_object_copy["response"] = redacted_standard_logging_payload(
+                        {"response": response}
+                    )["response"]
                 else:
                     # Standard ModelResponse format
                     model_response: Final = ModelResponse(choices=[Choices(message=Message(content=redacted_str))])
diff --git a/litellm/litellm_core_utils/redact_messages.py b/litellm/litellm_core_utils/redact_messages.py
index 8c77ef32cfb..d7d1d9128d1 100644
--- a/litellm/litellm_core_utils/redact_messages.py
+++ b/litellm/litellm_core_utils/redact_messages.py
@@ -172,6 +172,18 @@ def _redact_responses_api_output_dict(output_items, redacted_str: str):
             output_item["input"] = redacted_str
 
 
+def _redacted_responses_api_response(response: Mapping[str, object]) -> dict[str, object]:
+    output: Final = copy.deepcopy(response.get("output"))
+    if isinstance(output, list):
+        _redact_responses_api_output_dict(output, REDACTED_BY_LITELLM)
+    return {
+        **response,
+        "output": output,
+        **({"instructions": REDACTED_BY_LITELLM} if response.get("instructions") is not None else {}),
+        **({"reasoning": None} if response.get("reasoning") is not None else {}),
+    }
+
+
 def redacted_standard_logging_payload(payload: Mapping[str, object]) -> Mapping[str, object]:
     """
     Return a copy of a ``StandardLoggingPayload`` with its messages and response redacted.
@@ -193,10 +205,8 @@ def _redact_standard_logging_object(payload: Mapping[str, object]) -> dict[str,
     response: Final = standard_logging_object.get("response")
     if response is not None:
         if isinstance(response, dict) and "output" in response:
-            # ResponsesAPIResponse format - redact content in output items
-            if isinstance(response.get("output"), list):
-                _redact_responses_api_output_dict(response["output"], redacted_str)
-            redact_vertex_ai_metadata_from_logged_object(response)
+            standard_logging_object["response"] = _redacted_responses_api_response(response)
+            redact_vertex_ai_metadata_from_logged_object(standard_logging_object["response"])
         elif isinstance(response, dict) and "choices" in response:
             # ModelResponse dict format - redact content in choices
             if isinstance(response.get("choices"), list):
@@ -309,9 +319,10 @@ def perform_redaction(model_call_details: dict, result, redact_streaming_respons
                 _redact_model_response_dict_choices(_result["choices"], REDACTED_BY_LITELLM)
             redact_vertex_ai_metadata_from_logged_object(_result)
         elif isinstance(_result, dict) and "output" in _result:
-            if isinstance(_result.get("output"), list):
-                _redact_responses_api_output_dict(_result["output"], REDACTED_BY_LITELLM)
+            return _redacted_responses_api_response(_result)
         elif isinstance(_result, litellm.ResponsesAPIResponse):
+            if _result.instructions is not None:
+                _result.instructions = REDACTED_BY_LITELLM
             if hasattr(_result, "output"):
                 _redact_responses_api_output(_result.output)
             # Redact reasoning field in ResponsesAPIResponse
diff --git a/tests/unit/litellm_core_utils/test_redact_messages.py b/tests/unit/litellm_core_utils/test_redact_messages.py
index 76d037ce760..07445f38b95 100644
--- a/tests/unit/litellm_core_utils/test_redact_messages.py
+++ b/tests/unit/litellm_core_utils/test_redact_messages.py
@@ -6,6 +6,8 @@ but litellm_params["litellm_metadata"] is None.
 """
 
 import threading
+import copy
+import json
 from typing import Final
 from types import SimpleNamespace
 
@@ -23,6 +25,58 @@ from litellm.litellm_core_utils.redact_messages import (
 from litellm.responses.main import mock_responses_api_response
 
 
+@pytest.mark.parametrize("surface", ("typed", "dict", "standard", "callback"))
+def test_responses_redaction_removes_instructions_without_changing_the_response(surface: str) -> None:
+    response: Final = litellm.ResponsesAPIResponse.model_validate(
+        {
+            **mock_responses_api_response("private answer").model_dump(),
+            "instructions": "private system instructions",
+            "reasoning": {"effort": "low", "summary": "auto"},
+            "output": [
+                {
+                    "type": "reasoning",
+                    "id": "rs_test",
+                    "summary": [{"type": "summary_text", "text": "private reasoning"}],
+                },
+                {
+                    "type": "function_call",
+                    "id": "fc_test",
+                    "call_id": "call_test",
+                    "name": "lookup",
+                    "arguments": "private arguments",
+                },
+            ],
+        }
+    )
+    original: Final = response.model_dump()
+    payload: Final = {"response": copy.deepcopy(original), "model": "test-model"}
+    logger: Final = CustomLogger()
+    logger.turn_off_message_logging = True
+
+    surfaces: Final = {
+        "typed": lambda: perform_redaction({}, response).model_dump(),
+        "dict": lambda: perform_redaction({}, original),
+        "standard": lambda: redacted_standard_logging_payload(payload)["response"],
+        "callback": lambda: logger.redact_standard_logging_payload_from_model_call_details(
+            {"standard_logging_object": payload}
+        )["standard_logging_object"]["response"],
+    }
+    redacted: Final = surfaces[surface]()
+
+    assert redacted == {
+        **original,
+        "instructions": "redacted-by-litellm",
+        "reasoning": None,
+        "output": [
+            {**original["output"][0], "summary": [{"type": "summary_text", "text": "redacted-by-litellm"}]},
+            {**original["output"][1], "arguments": "redacted-by-litellm"},
+        ],
+    }
+    assert "private" not in json.dumps(redacted)
+    assert response.model_dump() == original
+    assert payload["response"] == original
+
+
 @pytest.fixture(autouse=True)
 def _reset_global_redaction():
     """Ensure the global setting is off for every test."""