diff --git a/sentry_sdk/ai/utils.py b/sentry_sdk/ai/utils.py
index 1d2b4483c9..78a64ab737 100644
--- a/sentry_sdk/ai/utils.py
+++ b/sentry_sdk/ai/utils.py
@@ -5,6 +5,8 @@
 from sys import getsizeof
 from typing import TYPE_CHECKING
 
+from sentry_sdk._types import SENSITIVE_DATA_SUBSTITUTE
+
 if TYPE_CHECKING:
     from typing import Any, Callable, Dict, List, Optional, Tuple
 
@@ -141,6 +143,57 @@ def _find_truncation_index(messages: "List[Dict[str, Any]]", max_bytes: int) ->
     return 0
 
 
+def redact_blob_message_parts(
+    messages: "List[Dict[str, Any]]",
+) -> "List[Dict[str, Any]]":
+    """
+    Redact blob message parts from the messages, by removing the "content" key.
+    e.g:
+    {
+        "role": "user",
+        "content": [
+            {
+                "text": "How many ponies do you see in the image?",
+                "type": "text"
+            },
+            {
+                "type": "blob",
+                "modality": "image",
+                "mime_type": "image/jpeg",
+                "content": "data:image/jpeg;base64,..."
+            }
+        ]
+    }
+    becomes:
+    {
+        "role": "user",
+        "content": [
+            {
+                "text": "How many ponies do you see in the image?",
+                "type": "text"
+            },
+            {
+                "type": "blob",
+                "modality": "image",
+                "mime_type": "image/jpeg",
+                "content": "[Filtered]"
+            }
+        ]
+    }
+    """
+
+    for message in messages:
+        if not isinstance(message, dict):
+            continue
+
+        content = message.get("content")
+        if isinstance(content, list):
+            for item in content:
+                if isinstance(item, dict) and item.get("type") == "blob":
+                    item["content"] = SENSITIVE_DATA_SUBSTITUTE
+    return messages
+
+
 def truncate_messages_by_size(
     messages: "List[Dict[str, Any]]",
     max_bytes: int = MAX_GEN_AI_MESSAGE_BYTES,
@@ -186,6 +239,8 @@ def truncate_and_annotate_messages(
     if not messages:
         return None
 
+    messages = redact_blob_message_parts(messages)
+
     truncated_messages, removed_count = truncate_messages_by_size(messages, max_bytes)
     if removed_count > 0:
         scope._gen_ai_original_message_count[span.span_id] = len(messages)
diff --git a/tests/test_ai_monitoring.py b/tests/test_ai_monitoring.py
index 8d3d4ba204..e9f3712cd3 100644
--- a/tests/test_ai_monitoring.py
+++ b/tests/test_ai_monitoring.py
@@ -4,7 +4,7 @@
 import pytest
 
 import sentry_sdk
-from sentry_sdk._types import AnnotatedValue
+from sentry_sdk._types import AnnotatedValue, SENSITIVE_DATA_SUBSTITUTE
 from sentry_sdk.ai.monitoring import ai_track
 from sentry_sdk.ai.utils import (
     MAX_GEN_AI_MESSAGE_BYTES,
@@ -13,6 +13,7 @@
     truncate_and_annotate_messages,
     truncate_messages_by_size,
     _find_truncation_index,
+    redact_blob_message_parts,
 )
 from sentry_sdk.serializer import serialize
 from sentry_sdk.utils import safe_serialize
@@ -542,3 +543,106 @@ def __init__(self):
         assert isinstance(messages_value, AnnotatedValue)
         assert messages_value.metadata["len"] == stored_original_length
         assert len(messages_value.value) == len(truncated_messages)
+
+
+class TestRedactBlobMessageParts:
+    def test_redacts_single_blob_content(self):
+        """Test that blob content is redacted in a message with single blob part"""
+        messages = [
+            {
+                "role": "user",
+                "content": [
+                    {
+                        "text": "How many ponies do you see in the image?",
+                        "type": "text",
+                    },
+                    {
+                        "type": "blob",
+                        "modality": "image",
+                        "mime_type": "image/jpeg",
+                        "content": "data:image/jpeg;base64,/9j/4AAQSkZJRg==",
+                    },
+                ],
+            }
+        ]
+
+        result = redact_blob_message_parts(messages)
+
+        assert result == messages  # Returns the same list
+        assert (
+            messages[0]["content"][0]["text"]
+            == "How many ponies do you see in the image?"
+        )
+        assert messages[0]["content"][0]["type"] == "text"
+        assert messages[0]["content"][1]["type"] == "blob"
+        assert messages[0]["content"][1]["modality"] == "image"
+        assert messages[0]["content"][1]["mime_type"] == "image/jpeg"
+        assert messages[0]["content"][1]["content"] == SENSITIVE_DATA_SUBSTITUTE
+
+    def test_redacts_multiple_blob_parts(self):
+        """Test that multiple blob parts in a single message are all redacted"""
+        messages = [
+            {
+                "role": "user",
+                "content": [
+                    {"text": "Compare these images", "type": "text"},
+                    {
+                        "type": "blob",
+                        "modality": "image",
+                        "mime_type": "image/jpeg",
+                        "content": "data:image/jpeg;base64,first_image",
+                    },
+                    {
+                        "type": "blob",
+                        "modality": "image",
+                        "mime_type": "image/png",
+                        "content": "data:image/png;base64,second_image",
+                    },
+                ],
+            }
+        ]
+
+        result = redact_blob_message_parts(messages)
+
+        assert result == messages
+        assert messages[0]["content"][0]["text"] == "Compare these images"
+        assert messages[0]["content"][1]["content"] == SENSITIVE_DATA_SUBSTITUTE
+        assert messages[0]["content"][2]["content"] == SENSITIVE_DATA_SUBSTITUTE
+
+    def test_redacts_blobs_in_multiple_messages(self):
+        """Test that blob parts are redacted across multiple messages"""
+        messages = [
+            {
+                "role": "user",
+                "content": [
+                    {"text": "First message", "type": "text"},
+                    {
+                        "type": "blob",
+                        "modality": "image",
+                        "content": "data:image/jpeg;base64,first",
+                    },
+                ],
+            },
+            {
+                "role": "assistant",
+                "content": "I see the image.",
+            },
+            {
+                "role": "user",
+                "content": [
+                    {"text": "Second message", "type": "text"},
+                    {
+                        "type": "blob",
+                        "modality": "image",
+                        "content": "data:image/jpeg;base64,second",
+                    },
+                ],
+            },
+        ]
+
+        result = redact_blob_message_parts(messages)
+
+        assert result == messages
+        assert messages[0]["content"][1]["content"] == SENSITIVE_DATA_SUBSTITUTE
+        assert messages[1]["content"] == "I see the image."  # Unchanged
+        assert messages[2]["content"][1]["content"] == SENSITIVE_DATA_SUBSTITUTE