diff --git a/python/packages/agbench/benchmarks/AssistantBench/Templates/MagenticOne/scenario.py b/python/packages/agbench/benchmarks/AssistantBench/Templates/MagenticOne/scenario.py
index 3d79a16614a4..17d9125195d1 100644
--- a/python/packages/agbench/benchmarks/AssistantBench/Templates/MagenticOne/scenario.py
+++ b/python/packages/agbench/benchmarks/AssistantBench/Templates/MagenticOne/scenario.py
@@ -12,9 +12,7 @@
 from autogen_core.application import SingleThreadedAgentRuntime
 from autogen_core.application.logging import EVENT_LOGGER_NAME
 from autogen_core.components.models import (
-    AzureOpenAIChatCompletionClient,
     ChatCompletionClient,
-    ModelCapabilities,
     UserMessage,
     LLMMessage,
 )
diff --git a/python/packages/agbench/benchmarks/GAIA/Templates/MagenticOne/scenario.py b/python/packages/agbench/benchmarks/GAIA/Templates/MagenticOne/scenario.py
index 4058d75f3971..6c7f8ab763a5 100644
--- a/python/packages/agbench/benchmarks/GAIA/Templates/MagenticOne/scenario.py
+++ b/python/packages/agbench/benchmarks/GAIA/Templates/MagenticOne/scenario.py
@@ -12,7 +12,6 @@
 from autogen_core.application import SingleThreadedAgentRuntime
 from autogen_core.application.logging import EVENT_LOGGER_NAME
 from autogen_core.components.models import (
-    AzureOpenAIChatCompletionClient,
     ChatCompletionClient,
     ModelCapabilities,
     UserMessage,
diff --git a/python/packages/agbench/benchmarks/HumanEval/Templates/MagenticOne/scenario.py b/python/packages/agbench/benchmarks/HumanEval/Templates/MagenticOne/scenario.py
index 3229eba12589..a9b62a1e38e1 100644
--- a/python/packages/agbench/benchmarks/HumanEval/Templates/MagenticOne/scenario.py
+++ b/python/packages/agbench/benchmarks/HumanEval/Templates/MagenticOne/scenario.py
@@ -7,8 +7,6 @@
 from autogen_core.components import DefaultSubscription, DefaultTopicId
 from autogen_core.components.code_executor import LocalCommandLineCodeExecutor
 from autogen_core.components.models import (
-    AzureOpenAIChatCompletionClient,
-    ModelCapabilities,
     UserMessage,
 )
 
diff --git a/python/packages/agbench/benchmarks/WebArena/Templates/MagenticOne/scenario.py b/python/packages/agbench/benchmarks/WebArena/Templates/MagenticOne/scenario.py
index 79a36862f9d2..5cbf5c4c2134 100644
--- a/python/packages/agbench/benchmarks/WebArena/Templates/MagenticOne/scenario.py
+++ b/python/packages/agbench/benchmarks/WebArena/Templates/MagenticOne/scenario.py
@@ -13,9 +13,7 @@
 from autogen_core.components import DefaultSubscription, DefaultTopicId
 from autogen_core.components.code_executor import LocalCommandLineCodeExecutor
 from autogen_core.components.models import (
-    AzureOpenAIChatCompletionClient,
     ChatCompletionClient,
-    ModelCapabilities,
     UserMessage,
     SystemMessage,
     LLMMessage,
diff --git a/python/packages/autogen-agentchat/tests/test_group_chat.py b/python/packages/autogen-agentchat/tests/test_group_chat.py
index e297c8fd5100..21fb2ad4082c 100644
--- a/python/packages/autogen-agentchat/tests/test_group_chat.py
+++ b/python/packages/autogen-agentchat/tests/test_group_chat.py
@@ -24,8 +24,9 @@
 from autogen_core.base import CancellationToken
 from autogen_core.components import FunctionCall
 from autogen_core.components.code_executor import LocalCommandLineCodeExecutor
-from autogen_core.components.models import FunctionExecutionResult, OpenAIChatCompletionClient
+from autogen_core.components.models import FunctionExecutionResult
 from autogen_core.components.tools import FunctionTool
+from autogen_ext.models import OpenAIChatCompletionClient
 from openai.resources.chat.completions import AsyncCompletions
 from openai.types.chat.chat_completion import ChatCompletion, Choice
 from openai.types.chat.chat_completion_chunk import ChatCompletionChunk
diff --git a/python/packages/autogen-core/docs/src/user-guide/core-user-guide/cookbook/azure-openai-with-aad-auth.md b/python/packages/autogen-core/docs/src/user-guide/core-user-guide/cookbook/azure-openai-with-aad-auth.md
index a40cf0475c5d..c8e4b632bd03 100644
--- a/python/packages/autogen-core/docs/src/user-guide/core-user-guide/cookbook/azure-openai-with-aad-auth.md
+++ b/python/packages/autogen-core/docs/src/user-guide/core-user-guide/cookbook/azure-openai-with-aad-auth.md
@@ -15,7 +15,7 @@ pip install azure-identity
 ## Using the Model Client
 
 ```python
-from autogen_core.components.models import AzureOpenAIChatCompletionClient
+from autogen_ext.models import AzureOpenAIChatCompletionClient
 from azure.identity import DefaultAzureCredential, get_bearer_token_provider
 
 # Create the token provider
diff --git a/python/packages/autogen-core/docs/src/user-guide/core-user-guide/cookbook/structured-output-agent.ipynb b/python/packages/autogen-core/docs/src/user-guide/core-user-guide/cookbook/structured-output-agent.ipynb
index 17b9141c5ae7..fa50d6da2797 100644
--- a/python/packages/autogen-core/docs/src/user-guide/core-user-guide/cookbook/structured-output-agent.ipynb
+++ b/python/packages/autogen-core/docs/src/user-guide/core-user-guide/cookbook/structured-output-agent.ipynb
@@ -65,7 +65,8 @@
     "import os\n",
     "from typing import Optional\n",
     "\n",
-    "from autogen_core.components.models import AzureOpenAIChatCompletionClient, UserMessage\n",
+    "from autogen_core.components.models import UserMessage\n",
+    "from autogen_ext.models import AzureOpenAIChatCompletionClient\n",
     "\n",
     "\n",
     "# Function to get environment variable and ensure it is not None\n",
diff --git a/python/packages/autogen-core/docs/src/user-guide/core-user-guide/cookbook/tool-use-with-intervention.ipynb b/python/packages/autogen-core/docs/src/user-guide/core-user-guide/cookbook/tool-use-with-intervention.ipynb
index 44f9978e59ef..e7c41c41feb4 100644
--- a/python/packages/autogen-core/docs/src/user-guide/core-user-guide/cookbook/tool-use-with-intervention.ipynb
+++ b/python/packages/autogen-core/docs/src/user-guide/core-user-guide/cookbook/tool-use-with-intervention.ipynb
@@ -26,13 +26,13 @@
     "from autogen_core.components.models import (\n",
     "    ChatCompletionClient,\n",
     "    LLMMessage,\n",
-    "    OpenAIChatCompletionClient,\n",
     "    SystemMessage,\n",
     "    UserMessage,\n",
     ")\n",
     "from autogen_core.components.tool_agent import ToolAgent, ToolException, tool_agent_caller_loop\n",
     "from autogen_core.components.tools import PythonCodeExecutionTool, ToolSchema\n",
-    "from autogen_ext.code_executors import DockerCommandLineCodeExecutor"
+    "from autogen_ext.code_executors import DockerCommandLineCodeExecutor\n",
+    "from autogen_ext.models import OpenAIChatCompletionClient"
    ]
   },
   {
diff --git a/python/packages/autogen-core/docs/src/user-guide/core-user-guide/design-patterns/group-chat.ipynb b/python/packages/autogen-core/docs/src/user-guide/core-user-guide/design-patterns/group-chat.ipynb
index 14dc6d2e9fef..3238656c426b 100644
--- a/python/packages/autogen-core/docs/src/user-guide/core-user-guide/design-patterns/group-chat.ipynb
+++ b/python/packages/autogen-core/docs/src/user-guide/core-user-guide/design-patterns/group-chat.ipynb
@@ -86,11 +86,11 @@
     "    AssistantMessage,\n",
     "    ChatCompletionClient,\n",
     "    LLMMessage,\n",
-    "    OpenAIChatCompletionClient,\n",
     "    SystemMessage,\n",
     "    UserMessage,\n",
     ")\n",
     "from autogen_core.components.tools import FunctionTool\n",
+    "from autogen_ext.models import OpenAIChatCompletionClient\n",
     "from IPython.display import display  # type: ignore\n",
     "from pydantic import BaseModel\n",
     "from rich.console import Console\n",
diff --git a/python/packages/autogen-core/docs/src/user-guide/core-user-guide/design-patterns/handoffs.ipynb b/python/packages/autogen-core/docs/src/user-guide/core-user-guide/design-patterns/handoffs.ipynb
index 6a952c6e3961..6fb9f71782b0 100644
--- a/python/packages/autogen-core/docs/src/user-guide/core-user-guide/design-patterns/handoffs.ipynb
+++ b/python/packages/autogen-core/docs/src/user-guide/core-user-guide/design-patterns/handoffs.ipynb
@@ -65,11 +65,11 @@
     "    FunctionExecutionResult,\n",
     "    FunctionExecutionResultMessage,\n",
     "    LLMMessage,\n",
-    "    OpenAIChatCompletionClient,\n",
     "    SystemMessage,\n",
     "    UserMessage,\n",
     ")\n",
     "from autogen_core.components.tools import FunctionTool, Tool\n",
+    "from autogen_ext.models import OpenAIChatCompletionClient\n",
     "from pydantic import BaseModel"
    ]
   },
diff --git a/python/packages/autogen-core/docs/src/user-guide/core-user-guide/framework/model-clients.ipynb b/python/packages/autogen-core/docs/src/user-guide/core-user-guide/framework/model-clients.ipynb
index 237b68ae0d33..b2b60be1458b 100644
--- a/python/packages/autogen-core/docs/src/user-guide/core-user-guide/framework/model-clients.ipynb
+++ b/python/packages/autogen-core/docs/src/user-guide/core-user-guide/framework/model-clients.ipynb
@@ -184,7 +184,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "from autogen_core.components.models import AzureOpenAIChatCompletionClient\n",
+    "from autogen_ext.models import AzureOpenAIChatCompletionClient\n",
     "from azure.identity import DefaultAzureCredential, get_bearer_token_provider\n",
     "\n",
     "# Create the token provider\n",
diff --git a/python/packages/autogen-ext/tests/models/test_openai_model_client.py b/python/packages/autogen-ext/tests/models/test_openai_model_client.py
index c09e5654cd6d..f712ef75c5b2 100644
--- a/python/packages/autogen-ext/tests/models/test_openai_model_client.py
+++ b/python/packages/autogen-ext/tests/models/test_openai_model_client.py
@@ -165,7 +165,7 @@ def tool2(test1: int, test2: List[int]) -> str:
 
     mockcalculate_vision_tokens = MagicMock()
     monkeypatch.setattr(
-        "autogen_core.components.models._openai_client.calculate_vision_tokens", mockcalculate_vision_tokens
+        "autogen_ext.models._openai._openai_client.calculate_vision_tokens", mockcalculate_vision_tokens
     )
 
     num_tokens = client.count_tokens(messages, tools=tools)
diff --git a/python/packages/autogen-magentic-one/pyproject.toml b/python/packages/autogen-magentic-one/pyproject.toml
index 72f6ef6f4033..a82de9bd6141 100644
--- a/python/packages/autogen-magentic-one/pyproject.toml
+++ b/python/packages/autogen-magentic-one/pyproject.toml
@@ -18,6 +18,7 @@ classifiers = [
 
 dependencies = [
     "autogen-core",
+    "autogen-ext",
     "beautifulsoup4",
     "aiofiles",
     "requests",
diff --git a/python/packages/autogen-magentic-one/src/autogen_magentic_one/utils.py b/python/packages/autogen-magentic-one/src/autogen_magentic_one/utils.py
index e47b24b25816..c7b15fe89e65 100644
--- a/python/packages/autogen-magentic-one/src/autogen_magentic_one/utils.py
+++ b/python/packages/autogen-magentic-one/src/autogen_magentic_one/utils.py
@@ -8,11 +8,10 @@
 from autogen_core.application.logging.events import LLMCallEvent
 from autogen_core.components import Image
 from autogen_core.components.models import (
-    AzureOpenAIChatCompletionClient,
     ChatCompletionClient,
     ModelCapabilities,
-    OpenAIChatCompletionClient,
 )
+from autogen_ext.models import AzureOpenAIChatCompletionClient, OpenAIChatCompletionClient
 
 from .messages import (
     AgentEvent,
diff --git a/python/uv.lock b/python/uv.lock
index a880003cce3e..d50453065b0f 100644
--- a/python/uv.lock
+++ b/python/uv.lock
@@ -522,6 +522,7 @@ source = { editable = "packages/autogen-magentic-one" }
 dependencies = [
     { name = "aiofiles" },
     { name = "autogen-core" },
+    { name = "autogen-ext" },
     { name = "beautifulsoup4" },
     { name = "mammoth" },
     { name = "markdownify" },
@@ -554,6 +555,7 @@ dev = [
 requires-dist = [
     { name = "aiofiles" },
     { name = "autogen-core", editable = "packages/autogen-core" },
+    { name = "autogen-ext", editable = "packages/autogen-ext" },
     { name = "beautifulsoup4" },
     { name = "mammoth" },
     { name = "markdownify" },