diff --git a/libs/core/langchain_core/messages/__init__.py b/libs/core/langchain_core/messages/__init__.py
index 4a28feedd8f..e8cae860bec 100644
--- a/libs/core/langchain_core/messages/__init__.py
+++ b/libs/core/langchain_core/messages/__init__.py
@@ -44,6 +44,7 @@ from langchain_core.messages.utils import (
     _message_from_dict,
     convert_to_messages,
     filter_messages,
+    format_messages_as,
     get_buffer_string,
     merge_message_runs,
     message_chunk_to_message,
@@ -83,4 +84,5 @@ __all__ = [
     "filter_messages",
     "merge_message_runs",
     "trim_messages",
+    "format_messages_as",
 ]
diff --git a/libs/core/langchain_core/messages/utils.py b/libs/core/langchain_core/messages/utils.py
index 0a916253397..3ad3d31699a 100644
--- a/libs/core/langchain_core/messages/utils.py
+++ b/libs/core/langchain_core/messages/utils.py
@@ -940,17 +940,38 @@ def format_messages_as(
 
         .. code-block:: python
 
-            from langchain_core.messages import format_messages_as
+            from langchain_core.messages import (
+                format_messages_as,
+                AIMessage,
+                HumanMessage,
+                SystemMessage,
+                ToolMessage,
+            )
 
             messages = [
-                SystemMessage,
-                {},
-                (),
-                AIMessage(),
-                ToolMessage(),
+                SystemMessage([{"type": "text", "text": "foo"}]),
+                {"role": "user", "content": [{"type": "text", "text": "whats in this"}, {"type": "image_url", "image_url": {"url": "data:image/png;base64,'/9j/4AAQSk'"}}]},
+                AIMessage("", tool_calls=[{"name": "analyze", "args": {"baz": "buz"}, "id": "1", "type": "tool_call"}]),
+                ToolMessage("foobar", tool_call_id="1", name="bar"),
+                {"role": "assistant", "content": "thats nice"},
             ]
             oai_strings = format_messages_as(messages, format="openai", text="string")
+            # -> [
+            #     SystemMessage(content='foo'),
+            #     HumanMessage(content=[{'type': 'text', 'text': 'whats in this'}, {'type': 'image_url', 'image_url': {'url': "data:image/png;base64,'/9j/4AAQSk'"}}]),
+            #     AIMessage(content='', tool_calls=[{'name': 'analyze', 'args': {'baz': 'buz'}, 'id': '1', 'type': 'tool_call'}]),
+            #     ToolMessage(content='foobar', name='bar', tool_call_id='1'),
+            #     AIMessage(content='thats nice')
+            # ]
+
             anthropic_blocks = format_messages_as(messages, format="anthropic", text="block")
+            # -> [
+            #     SystemMessage(content=[{'type': 'text', 'text': 'foo'}]),
+            #     HumanMessage(content=[{'type': 'text', 'text': 'whats in this'}, {'type': 'image', 'source': {'type': 'base64', 'media_type': 'image/png', 'data': "'/9j/4AAQSk'"}}]),
+            #     AIMessage(content=[{'type': 'tool_use', 'input': {'baz': 'buz'}, 'id': '1', 'name': 'analyze'}], tool_calls=[{'name': 'analyze', 'args': {'baz': 'buz'}, 'id': '1', 'type': 'tool_call'}]),
+            #     HumanMessage(content=[{'type': 'tool_result', 'content': 'foobar', 'tool_use_id': '1', 'is_error': False}]),
+            #     AIMessage(content=[{'type': 'text', 'text': 'thats nice'}])
+            # ]
 
     .. dropdown::  Chain usage
         :open:
@@ -1679,7 +1700,7 @@ def _openai_image_to_anthropic(image: dict) -> Dict:
     And throws an error if it's not a b64 image
     """
     regex = r"^data:(?P<media_type>image/.+);base64,(?P<data>.+)$"
-    match = re.match(regex, image["image_url"])
+    match = re.match(regex, image["image_url"]["url"])
     if match is None:
         raise ValueError(
             "Anthropic only supports base64-encoded images currently."
diff --git a/libs/core/tests/unit_tests/messages/test_imports.py b/libs/core/tests/unit_tests/messages/test_imports.py
index 531409a4261..5a30b399379 100644
--- a/libs/core/tests/unit_tests/messages/test_imports.py
+++ b/libs/core/tests/unit_tests/messages/test_imports.py
@@ -32,6 +32,7 @@ EXPECTED_ALL = [
     "filter_messages",
     "merge_message_runs",
     "trim_messages",
+    "format_messages_as",
 ]
 
 
diff --git a/libs/core/tests/unit_tests/messages/test_utils.py b/libs/core/tests/unit_tests/messages/test_utils.py
index abdd0a7eb5a..9a1d34bc3ed 100644
--- a/libs/core/tests/unit_tests/messages/test_utils.py
+++ b/libs/core/tests/unit_tests/messages/test_utils.py
@@ -672,7 +672,7 @@ def test_format_messages_as_anthropic_image() -> None:
         HumanMessage(
             content=[
                 {"type": "text", "text": "Here's an image:"},
-                {"type": "image_url", "image_url": base64_image},
+                {"type": "image_url", "image_url": {"url": base64_image}},
             ]
         )
     ]