diff --git a/generative_ai/gemini_reasoning_engine.py b/generative_ai/gemini_reasoning_engine.py
new file mode 100644
index 00000000000..b25dd2c73cf
--- /dev/null
+++ b/generative_ai/gemini_reasoning_engine.py
@@ -0,0 +1,204 @@
+# Copyright 2024 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from typing import Dict, List, Union
+
+from vertexai.preview import reasoning_engines
+
+
+def create_reasoning_engine_basic(
+    project_id: str, staging_bucket: str
+) -> reasoning_engines.ReasoningEngine:
+    # [START generativeaionvertexai_create_reasoning_engine_basic]
+    import vertexai
+    from vertexai.preview import reasoning_engines
+
+    # TODO(developer): Update and un-comment below lines
+    # project_id = "PROJECT_ID"
+    # staging_bucket = "gs://YOUR_BUCKET_NAME"
+
+    vertexai.init(
+        project=project_id, location="us-central1", staging_bucket=staging_bucket
+    )
+
+    class SimpleAdditionApp:
+        def query(self, a: int, b: int) -> str:
+            """Query the application.
+
+            Args:
+                a: The first input number
+                b: The second input number
+
+            Returns:
+                int: The additional result.
+            """
+
+            return f"{int(a)} + {int(b)} is {int(a + b)}"
+
+    # Locally test
+    app = SimpleAdditionApp()
+    app.query(a=1, b=2)
+
+    # Create a remote app with reasoning engine.
+    # This may take 1-2 minutes to finish.
+    reasoning_engine = reasoning_engines.ReasoningEngine.create(
+        SimpleAdditionApp(),
+        display_name="Demo Addition App",
+        description="A simple demo addition app",
+        requirements=[],
+        extra_packages=[],
+    )
+    # [END generativeaionvertexai_create_reasoning_engine_basic]
+    return reasoning_engine
+
+
+def create_reasoning_engine_advanced(
+    project_id: str, location: str, staging_bucket: str
+) -> reasoning_engines.ReasoningEngine:
+    # [START generativeaionvertexai_create_reasoning_engine_advanced]
+
+    from typing import List
+
+    import vertexai
+    from vertexai.preview import reasoning_engines
+
+    # TODO(developer): Update and un-comment below lines
+    # project_id = "PROJECT_ID"
+    # location = "us-central1"
+    # staging_bucket = "gs://YOUR_BUCKET_NAME"
+
+    vertexai.init(project=project_id, location=location, staging_bucket=staging_bucket)
+
+    class LangchainApp:
+        def __init__(self, project: str, location: str) -> None:
+            self.project_id = project
+            self.location = location
+
+        def set_up(self) -> None:
+            from langchain_core.prompts import ChatPromptTemplate
+            from langchain_google_vertexai import ChatVertexAI
+
+            system = (
+                "You are a helpful assistant that answers questions "
+                "about Google Cloud."
+            )
+            human = "{text}"
+            prompt = ChatPromptTemplate.from_messages(
+                [("system", system), ("human", human)]
+            )
+            chat = ChatVertexAI(project=self.project_id, location=self.location)
+            self.chain = prompt | chat
+
+        def query(self, question: str) -> Union[str, List[Union[str, Dict]]]:
+            """Query the application.
+
+            Args:
+                question: The user prompt.
+
+            Returns:
+                str: The LLM response.
+            """
+            return self.chain.invoke({"text": question}).content
+
+    # Locally test
+    app = LangchainApp(project=project_id, location=location)
+    app.set_up()
+    print(app.query("What is Vertex AI?"))
+
+    # Create a remote app with reasoning engine
+    # This may take 1-2 minutes to finish because it builds a container and turn up HTTP servers.
+    reasoning_engine = reasoning_engines.ReasoningEngine.create(
+        LangchainApp(project=project_id, location=location),
+        requirements=[
+            "google-cloud-aiplatform==1.50.0",
+            "langchain-google-vertexai",
+            "langchain-core",
+        ],
+        display_name="Demo LangChain App",
+        description="This is a simple LangChain app.",
+        # sys_version="3.10",  # Optional
+        extra_packages=[],
+    )
+    # [END generativeaionvertexai_create_reasoning_engine_advanced]
+    return reasoning_engine
+
+
+def query_reasoning_engine(project_id: str, reasoning_engine_id: str) -> object:
+    # [START generativeaionvertexai_query_reasoning_engine]
+    import vertexai
+    from vertexai.preview import reasoning_engines
+
+    # TODO(developer): Update and un-comment below lines
+    # project_id = "PROJECT_ID"
+    # reasoning_engine_id = "REASONING_ENGINE_ID"
+
+    vertexai.init(project=project_id, location="us-central1")
+    reasoning_engine = reasoning_engines.ReasoningEngine(reasoning_engine_id)
+
+    # Replace with kwargs for `.query()` method.
+    response = reasoning_engine.query(a=1, b=2)
+    print(response)
+    # [END generativeaionvertexai_query_reasoning_engine]
+    return response
+
+
+def list_reasoning_engines(project_id: str) -> List[reasoning_engines.ReasoningEngine]:
+    # [START generativeaionvertexai_list_reasoning_engines]
+    import vertexai
+    from vertexai.preview import reasoning_engines
+
+    # TODO(developer): Update and un-comment below lines
+    # project_id = "PROJECT_ID"
+
+    vertexai.init(project=project_id, location="us-central1")
+
+    reasoning_engine_list = reasoning_engines.ReasoningEngine.list()
+    print(reasoning_engine_list)
+    # [END generativeaionvertexai_list_reasoning_engines]
+    return reasoning_engine_list
+
+
+def get_reasoning_engine(
+    project_id: str, reasoning_engine_id: str
+) -> reasoning_engines.ReasoningEngine:
+    # [START generativeaionvertexai_get_reasoning_engine]
+    import vertexai
+    from vertexai.preview import reasoning_engines
+
+    # TODO(developer): Update and un-comment below lines
+    # project_id = "PROJECT_ID"
+    # reasoning_engine_id = "REASONING_ENGINE_ID"
+
+    vertexai.init(project=project_id, location="us-central1")
+
+    reasoning_engine = reasoning_engines.ReasoningEngine(reasoning_engine_id)
+    print(reasoning_engine)
+    # [END generativeaionvertexai_get_reasoning_engine]
+    return reasoning_engine
+
+
+def delete_reasoning_engine(project_id: str, reasoning_engine_id: str) -> None:
+    # [START generativeaionvertexai_delete_reasoning_engine]
+    import vertexai
+    from vertexai.preview import reasoning_engines
+
+    # TODO(developer): Update and un-comment below lines
+    # project_id = "PROJECT_ID"
+    # reasoning_engine_id = "REASONING_ENGINE_ID"
+
+    vertexai.init(project=project_id, location="us-central1")
+
+    reasoning_engine = reasoning_engines.ReasoningEngine(reasoning_engine_id)
+    reasoning_engine.delete()
+    # [END generativeaionvertexai_delete_reasoning_engine]
diff --git a/generative_ai/gemini_reasoning_engine_test.py b/generative_ai/gemini_reasoning_engine_test.py
new file mode 100644
index 00000000000..243eecffc73
--- /dev/null
+++ b/generative_ai/gemini_reasoning_engine_test.py
@@ -0,0 +1,74 @@
+# Copyright 2024 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import os
+import sys
+from typing import Generator
+
+import pytest
+
+import gemini_reasoning_engine
+
+PROJECT_ID = os.getenv("GOOGLE_CLOUD_PROJECT")
+REGION = "us-central1"
+STAGING_BUCKET = "gs://ucaip-samples-us-central1"
+
+
+@pytest.fixture(scope="module")
+def reasoning_engine_id() -> Generator[str, None, None]:
+    reasoning_engine = gemini_reasoning_engine.create_reasoning_engine_basic(
+        PROJECT_ID, STAGING_BUCKET
+    )
+    yield reasoning_engine.resource_name
+    print("Deleting Reasoning Engine...")
+    gemini_reasoning_engine.delete_reasoning_engine(
+        PROJECT_ID, reasoning_engine.resource_name
+    )
+
+
+@pytest.mark.skipif(
+    sys.version_info >= (3, 12), reason="requires Python version lower than 3.12"
+)
+def test_create_reasoning_engine_basic(reasoning_engine_id: str) -> None:
+    assert reasoning_engine_id
+
+
+def test_create_reasoning_engine_advanced() -> None:
+    reasoning_engine = gemini_reasoning_engine.create_reasoning_engine_advanced(
+        PROJECT_ID, REGION, STAGING_BUCKET
+    )
+    assert reasoning_engine
+    gemini_reasoning_engine.delete_reasoning_engine(
+        PROJECT_ID, reasoning_engine.resource_name
+    )
+
+
+def test_query_reasoning_engine(reasoning_engine_id: str) -> None:
+    response = gemini_reasoning_engine.query_reasoning_engine(
+        PROJECT_ID, reasoning_engine_id
+    )
+    assert response
+    assert response == "1 + 2 is 3"
+
+
+def test_list_reasoning_engines() -> None:
+    response = gemini_reasoning_engine.list_reasoning_engines(PROJECT_ID)
+    assert response
+
+
+def test_get_reasoning_engine(reasoning_engine_id: str) -> None:
+    response = gemini_reasoning_engine.get_reasoning_engine(
+        PROJECT_ID, reasoning_engine_id
+    )
+    assert response
diff --git a/generative_ai/requirements-test.txt b/generative_ai/requirements-test.txt
index fceefa0d35e..5867597a7da 100644
--- a/generative_ai/requirements-test.txt
+++ b/generative_ai/requirements-test.txt
@@ -1,4 +1,4 @@
 backoff==2.2.1
-google-api-core==2.17.1
+google-api-core==2.19.0
 pytest==8.1.1
 pytest-asyncio==0.23.6
diff --git a/generative_ai/requirements.txt b/generative_ai/requirements.txt
index 709fb2fa04a..e92c5e171cb 100644
--- a/generative_ai/requirements.txt
+++ b/generative_ai/requirements.txt
@@ -2,6 +2,8 @@ pandas==1.3.5; python_version == '3.7'
 pandas==2.0.1; python_version > '3.7'
 pillow==9.5.0; python_version < '3.8'
 pillow==10.3.0; python_version >= '3.8'
-google-cloud-aiplatform[pipelines]==1.50.0
-google-auth==2.17.3
+google-cloud-aiplatform[pipelines,reasoningengine]==1.50.0
+google-auth==2.29.0
 anthropic[vertex]==0.25.6
+langchain-core==0.1.52
+langchain-google-vertexai==1.0.3