diff --git a/libs/partners/ollama/langchain_ollama/__init__.py b/libs/partners/ollama/langchain_ollama/__init__.py
index d514785b7a2..6cf0d9a7c2c 100644
--- a/libs/partners/ollama/langchain_ollama/__init__.py
+++ b/libs/partners/ollama/langchain_ollama/__init__.py
@@ -10,6 +10,7 @@ service.
     exist locally. This is useful for ensuring that the model is available before
     attempting to use it, especially in environments where models may not be
     pre-downloaded.
+
 """
 
 from importlib import metadata
@@ -20,6 +21,8 @@ from langchain_ollama.embeddings import OllamaEmbeddings
 from langchain_ollama.llms import OllamaLLM
 
 try:
+    if __package__ is None:
+        raise metadata.PackageNotFoundError
     __version__ = metadata.version(__package__)
 except metadata.PackageNotFoundError:
     # Case where package metadata is not available.
diff --git a/libs/partners/ollama/langchain_ollama/_compat.py b/libs/partners/ollama/langchain_ollama/_compat.py
index 9e1d2c235d2..5f9278d093d 100644
--- a/libs/partners/ollama/langchain_ollama/_compat.py
+++ b/libs/partners/ollama/langchain_ollama/_compat.py
@@ -53,8 +53,8 @@ def _convert_content_blocks_to_ollama_format(
             text_content += text_block["text"]
         elif block_type == "image":
             image_block = cast(ImageContentBlock, block)
-            if image_block.get("source_type") == "base64":
-                images.append(image_block.get("data", ""))
+            if image_block.get("base64"):
+                images.append(image_block.get("base64", ""))
             else:
                 msg = "Only base64 image data is supported by Ollama"
                 raise ValueError(msg)
diff --git a/libs/partners/ollama/langchain_ollama/chat_models_v1.py b/libs/partners/ollama/langchain_ollama/chat_models_v1.py
index 301d358ee8a..28024f5150a 100644
--- a/libs/partners/ollama/langchain_ollama/chat_models_v1.py
+++ b/libs/partners/ollama/langchain_ollama/chat_models_v1.py
@@ -2,6 +2,8 @@
 
 This implementation provides native support for v1 messages with structured
 content blocks and always returns AIMessageV1 format responses.
+
+.. versionadded:: 1.0.0
 """
 
 from __future__ import annotations
diff --git a/libs/partners/ollama/tests/integration_tests/chat_models/test_chat_models_reasoning.py b/libs/partners/ollama/tests/integration_tests/chat_models/test_chat_models_reasoning.py
index 83914979dad..84ad466a32c 100644
--- a/libs/partners/ollama/tests/integration_tests/chat_models/test_chat_models_reasoning.py
+++ b/libs/partners/ollama/tests/integration_tests/chat_models/test_chat_models_reasoning.py
@@ -35,12 +35,10 @@ def test_stream_no_reasoning(model: str) -> None:
         result += chunk
     assert isinstance(result, AIMessageChunk)
     assert result.content
-    assert "reasoning_content" not in result.additional_kwargs
     assert "<think>" not in result.content and "</think>" not in result.content
-    # Only check additional_kwargs for v0 format (content as string)
-    if not isinstance(result.content, list):
-        assert "<think>" not in result.additional_kwargs.get("reasoning_content", "")
-        assert "</think>" not in result.additional_kwargs.get("reasoning_content", "")
+    if hasattr(result, "additional_kwargs"):
+        # v0 format
+        assert "reasoning_content" not in result.additional_kwargs
 
 
 @pytest.mark.parametrize(("model"), [("deepseek-r1:1.5b")])
@@ -62,12 +60,10 @@ async def test_astream_no_reasoning(model: str) -> None:
         result += chunk
     assert isinstance(result, AIMessageChunk)
     assert result.content
-    assert "reasoning_content" not in result.additional_kwargs
     assert "<think>" not in result.content and "</think>" not in result.content
-    # Only check additional_kwargs for v0 format (content as string)
-    if not isinstance(result.content, list):
-        assert "<think>" not in result.additional_kwargs.get("reasoning_content", "")
-        assert "</think>" not in result.additional_kwargs.get("reasoning_content", "")
+    if hasattr(result, "additional_kwargs"):
+        # v0 format
+        assert "reasoning_content" not in result.additional_kwargs
 
 
 @pytest.mark.parametrize(("model"), [("deepseek-r1:1.5b")])
@@ -91,8 +87,8 @@ def test_stream_reasoning_none(model: str) -> None:
     assert result.content
     assert "reasoning_content" not in result.additional_kwargs
     assert "<think>" in result.content and "</think>" in result.content
-    # Only check additional_kwargs for v0 format (content as string)
     if not isinstance(result.content, list):
+        # v0 format (content as string)
         assert "<think>" not in result.additional_kwargs.get("reasoning_content", "")
         assert "</think>" not in result.additional_kwargs.get("reasoning_content", "")
 
@@ -118,8 +114,8 @@ async def test_astream_reasoning_none(model: str) -> None:
     assert result.content
     assert "reasoning_content" not in result.additional_kwargs
     assert "<think>" in result.content and "</think>" in result.content
-    # Only check additional_kwargs for v0 format (content as string)
     if not isinstance(result.content, list):
+        # v0 format (content as string)
         assert "<think>" not in result.additional_kwargs.get("reasoning_content", "")
         assert "</think>" not in result.additional_kwargs.get("reasoning_content", "")
 
@@ -146,8 +142,8 @@ def test_reasoning_stream(model: str) -> None:
     assert "reasoning_content" in result.additional_kwargs
     assert len(result.additional_kwargs["reasoning_content"]) > 0
     assert "<think>" not in result.content and "</think>" not in result.content
-    # Only check additional_kwargs for v0 format (content as string)
     if not isinstance(result.content, list):
+        # v0 format (content as string)
         assert "<think>" not in result.additional_kwargs["reasoning_content"]
         assert "</think>" not in result.additional_kwargs["reasoning_content"]
 
@@ -174,8 +170,8 @@ async def test_reasoning_astream(model: str) -> None:
     assert "reasoning_content" in result.additional_kwargs
     assert len(result.additional_kwargs["reasoning_content"]) > 0
     assert "<think>" not in result.content and "</think>" not in result.content
-    # Only check additional_kwargs for v0 format (content as string)
     if not isinstance(result.content, list):
+        # v0 format (content as string)
         assert "<think>" not in result.additional_kwargs["reasoning_content"]
         assert "</think>" not in result.additional_kwargs["reasoning_content"]
 
@@ -188,10 +184,9 @@ def test_invoke_no_reasoning(model: str) -> None:
     result = llm.invoke([message])
     assert result.content
     assert "<think>" not in result.content and "</think>" not in result.content
-    # Only check additional_kwargs for v0 format (content as string)
-    if not isinstance(result.content, list):
-        assert "<think>" not in result.additional_kwargs.get("reasoning_content", "")
-        assert "</think>" not in result.additional_kwargs.get("reasoning_content", "")
+    if hasattr(result, "additional_kwargs"):
+        # v0 format
+        assert "reasoning_content" not in result.additional_kwargs
 
 
 @pytest.mark.parametrize(("model"), [("deepseek-r1:1.5b")])
@@ -202,10 +197,9 @@ async def test_ainvoke_no_reasoning(model: str) -> None:
     result = await llm.ainvoke([message])
     assert result.content
     assert "<think>" not in result.content and "</think>" not in result.content
-    # Only check additional_kwargs for v0 format (content as string)
-    if not isinstance(result.content, list):
-        assert "<think>" not in result.additional_kwargs.get("reasoning_content", "")
-        assert "</think>" not in result.additional_kwargs.get("reasoning_content", "")
+    if hasattr(result, "additional_kwargs"):
+        # v0 format
+        assert "reasoning_content" not in result.additional_kwargs
 
 
 @pytest.mark.parametrize(("model"), [("deepseek-r1:1.5b")])
@@ -217,8 +211,8 @@ def test_invoke_reasoning_none(model: str) -> None:
     assert result.content
     assert "reasoning_content" not in result.additional_kwargs
     assert "<think>" in result.content and "</think>" in result.content
-    # Only check additional_kwargs for v0 format (content as string)
     if not isinstance(result.content, list):
+        # v0 format (content as string)
         assert "<think>" not in result.additional_kwargs.get("reasoning_content", "")
         assert "</think>" not in result.additional_kwargs.get("reasoning_content", "")
 
@@ -232,8 +226,8 @@ async def test_ainvoke_reasoning_none(model: str) -> None:
     assert result.content
     assert "reasoning_content" not in result.additional_kwargs
     assert "<think>" in result.content and "</think>" in result.content
-    # Only check additional_kwargs for v0 format (content as string)
     if not isinstance(result.content, list):
+        # v0 format (content as string)
         assert "<think>" not in result.additional_kwargs.get("reasoning_content", "")
         assert "</think>" not in result.additional_kwargs.get("reasoning_content", "")
 
@@ -248,8 +242,8 @@ def test_reasoning_invoke(model: str) -> None:
     assert "reasoning_content" in result.additional_kwargs
     assert len(result.additional_kwargs["reasoning_content"]) > 0
     assert "<think>" not in result.content and "</think>" not in result.content
-    # Only check additional_kwargs for v0 format (content as string)
     if not isinstance(result.content, list):
+        # v0 format (content as string)
         assert "<think>" not in result.additional_kwargs["reasoning_content"]
         assert "</think>" not in result.additional_kwargs["reasoning_content"]
 
diff --git a/libs/partners/ollama/tests/unit_tests/test_base_v1.py b/libs/partners/ollama/tests/unit_tests/test_base_v1.py
index 592d0059bec..65a12858cf8 100644
--- a/libs/partners/ollama/tests/unit_tests/test_base_v1.py
+++ b/libs/partners/ollama/tests/unit_tests/test_base_v1.py
@@ -13,6 +13,8 @@ from langchain_ollama._compat import (
 )
 from langchain_ollama.chat_models_v1 import ChatOllamaV1
 
+MODEL_NAME = "llama3.1"
+
 
 class TestMessageConversion:
     """Test v1 message conversion utilities."""
@@ -34,11 +36,10 @@ class TestMessageConversion:
         message = HumanMessageV1(
             content=[
                 TextContentBlock(type="text", text="Describe this image:"),
-                ImageContentBlock(  # type: ignore[typeddict-unknown-key]
+                ImageContentBlock(
                     type="image",
                     mime_type="image/jpeg",
-                    data="base64imagedata",
-                    source_type="base64",
+                    base64="base64imagedata",
                 ),
             ]
         )
@@ -74,7 +75,7 @@ class TestMessageConversion:
     def test_convert_from_ollama_format(self) -> None:
         """Test converting Ollama response to AIMessageV1."""
         ollama_response = {
-            "model": "llama3",
+            "model": MODEL_NAME,
             "created_at": "2024-01-01T00:00:00Z",
             "message": {
                 "role": "assistant",
@@ -93,13 +94,13 @@ class TestMessageConversion:
         assert len(result.content) == 1
         assert result.content[0]["type"] == "text"
         assert result.content[0]["text"] == "Hello! How can I help you today?"
-        assert result.response_metadata["model_name"] == "llama3"
-        assert result.response_metadata.get("done") is True  # type: ignore[typeddict-item]
+        assert result.response_metadata["model_name"] == MODEL_NAME  # type: ignore[typeddict-not-required-key]
+        assert result.response_metadata.get("done") is True
 
     def test_convert_chunk_to_v1(self) -> None:
         """Test converting Ollama streaming chunk to AIMessageChunkV1."""
         chunk = {
-            "model": "llama3",
+            "model": MODEL_NAME,
             "created_at": "2024-01-01T00:00:00Z",
             "message": {"role": "assistant", "content": "Hello"},
             "done": False,
@@ -127,14 +128,14 @@ class TestChatOllamaV1:
 
     def test_initialization(self) -> None:
         """Test ChatOllamaV1 initialization."""
-        llm = ChatOllamaV1(model="llama3")
+        llm = ChatOllamaV1(model=MODEL_NAME)
 
-        assert llm.model == "llama3"
+        assert llm.model == MODEL_NAME
         assert llm._llm_type == "chat-ollama-v1"
 
     def test_chat_params(self) -> None:
         """Test _chat_params method."""
-        llm = ChatOllamaV1(model="llama3", temperature=0.7)
+        llm = ChatOllamaV1(model=MODEL_NAME, temperature=0.7)
 
         messages: list[MessageV1] = [
             HumanMessageV1(content=[TextContentBlock(type="text", text="Hello")])
@@ -142,26 +143,28 @@ class TestChatOllamaV1:
 
         params = llm._chat_params(messages)
 
-        assert params["model"] == "llama3"
+        assert params["model"] == MODEL_NAME
         assert len(params["messages"]) == 1
         assert params["messages"][0]["role"] == "user"
         assert params["messages"][0]["content"] == "Hello"
+
+        # Ensure options carry thru
         assert params["options"].temperature == 0.7
 
     def test_ls_params(self) -> None:
         """Test LangSmith parameters."""
-        llm = ChatOllamaV1(model="llama3", temperature=0.5)
+        llm = ChatOllamaV1(model=MODEL_NAME, temperature=0.5)
 
         ls_params = llm._get_ls_params()
 
-        assert ls_params["ls_provider"] == "ollama"
-        assert ls_params["ls_model_name"] == "llama3"
-        assert ls_params["ls_model_type"] == "chat"
-        assert ls_params["ls_temperature"] == 0.5
+        assert ls_params["ls_provider"] == "ollama"  # type: ignore[typeddict-not-required-key]
+        assert ls_params["ls_model_name"] == MODEL_NAME  # type: ignore[typeddict-not-required-key]
+        assert ls_params["ls_model_type"] == "chat"  # type: ignore[typeddict-not-required-key]
+        assert ls_params["ls_temperature"] == 0.5  # type: ignore[typeddict-not-required-key]
 
     def test_bind_tools_basic(self) -> None:
         """Test basic tool binding functionality."""
-        llm = ChatOllamaV1(model="llama3")
+        llm = ChatOllamaV1(model=MODEL_NAME)
 
         def test_tool(query: str) -> str:
             """A test tool."""