diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 7ef7bb772e..045e3819b6 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "1.64.0"
+  ".": "1.65.0"
 }
\ No newline at end of file
diff --git a/.stats.yml b/.stats.yml
index 658877d3b0..163146e38d 100644
--- a/.stats.yml
+++ b/.stats.yml
@@ -1,2 +1,2 @@
 configured_endpoints: 74
-openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/openai-4aa6ee65ba9efc789e05e6a5ef0883b2cadf06def8efd863dbf75e9e233067e1.yml
+openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/openai-5d30684c3118d049682ea30cdb4dbef39b97d51667da484689193dc40162af32.yml
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1aa32a14bd..f6190ab04e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,18 @@
 # Changelog
 
+## 1.65.0 (2025-02-27)
+
+Full Changelog: [v1.64.0...v1.65.0](https://github.com/openai/openai-python/compare/v1.64.0...v1.65.0)
+
+### Features
+
+* **api:** add gpt-4.5-preview ([#2149](https://github.com/openai/openai-python/issues/2149)) ([4cee52e](https://github.com/openai/openai-python/commit/4cee52e8d191b0532f28d86446da79b43a58b907))
+
+
+### Chores
+
+* **internal:** properly set __pydantic_private__ ([#2144](https://github.com/openai/openai-python/issues/2144)) ([2b1bd16](https://github.com/openai/openai-python/commit/2b1bd1604a038ded67367742a0b1c9d92e29dfc8))
+
 ## 1.64.0 (2025-02-22)
 
 Full Changelog: [v1.63.2...v1.64.0](https://github.com/openai/openai-python/compare/v1.63.2...v1.64.0)
diff --git a/pyproject.toml b/pyproject.toml
index 7cd583da3f..511da522a7 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "openai"
-version = "1.64.0"
+version = "1.65.0"
 description = "The official Python library for the openai API"
 dynamic = ["readme"]
 license = "Apache-2.0"
diff --git a/src/openai/_base_client.py b/src/openai/_base_client.py
index 94a5edd010..43dc9ab2a4 100644
--- a/src/openai/_base_client.py
+++ b/src/openai/_base_client.py
@@ -63,7 +63,7 @@
     ModelBuilderProtocol,
 )
 from ._utils import SensitiveHeadersFilter, is_dict, is_list, asyncify, is_given, lru_cache, is_mapping
-from ._compat import model_copy, model_dump
+from ._compat import PYDANTIC_V2, model_copy, model_dump
 from ._models import GenericModel, FinalRequestOptions, validate_type, construct_type
 from ._response import (
     APIResponse,
@@ -209,6 +209,9 @@ def _set_private_attributes(
         model: Type[_T],
         options: FinalRequestOptions,
     ) -> None:
+        if PYDANTIC_V2 and getattr(self, "__pydantic_private__", None) is None:
+            self.__pydantic_private__ = {}
+
         self._model = model
         self._client = client
         self._options = options
@@ -294,6 +297,9 @@ def _set_private_attributes(
         client: AsyncAPIClient,
         options: FinalRequestOptions,
     ) -> None:
+        if PYDANTIC_V2 and getattr(self, "__pydantic_private__", None) is None:
+            self.__pydantic_private__ = {}
+
         self._model = model
         self._client = client
         self._options = options
diff --git a/src/openai/_version.py b/src/openai/_version.py
index 0a898ceeb8..31af749758 100644
--- a/src/openai/_version.py
+++ b/src/openai/_version.py
@@ -1,4 +1,4 @@
 # File generated from our OpenAPI spec by Stainless. See CONTRIBUTING.md for details.
 
 __title__ = "openai"
-__version__ = "1.64.0"  # x-release-please-version
+__version__ = "1.65.0"  # x-release-please-version
diff --git a/src/openai/resources/beta/assistants.py b/src/openai/resources/beta/assistants.py
index 462086f74b..d2bb8d7b92 100644
--- a/src/openai/resources/beta/assistants.py
+++ b/src/openai/resources/beta/assistants.py
@@ -232,6 +232,8 @@ def update(
                 "gpt-4o-2024-05-13",
                 "gpt-4o-mini",
                 "gpt-4o-mini-2024-07-18",
+                "gpt-4.5-preview",
+                "gpt-4.5-preview-2025-02-27",
                 "gpt-4-turbo",
                 "gpt-4-turbo-2024-04-09",
                 "gpt-4-0125-preview",
@@ -673,6 +675,8 @@ async def update(
                 "gpt-4o-2024-05-13",
                 "gpt-4o-mini",
                 "gpt-4o-mini-2024-07-18",
+                "gpt-4.5-preview",
+                "gpt-4.5-preview-2025-02-27",
                 "gpt-4-turbo",
                 "gpt-4-turbo-2024-04-09",
                 "gpt-4-0125-preview",
diff --git a/src/openai/resources/beta/realtime/realtime.py b/src/openai/resources/beta/realtime/realtime.py
index 235790a9f5..0cf7c85799 100644
--- a/src/openai/resources/beta/realtime/realtime.py
+++ b/src/openai/resources/beta/realtime/realtime.py
@@ -561,14 +561,17 @@ def __init__(self, connection: RealtimeConnection) -> None:
 
 class RealtimeSessionResource(BaseRealtimeConnectionResource):
     def update(self, *, session: session_update_event_param.Session, event_id: str | NotGiven = NOT_GIVEN) -> None:
-        """Send this event to update the session’s default configuration.
+        """
+        Send this event to update the session’s default configuration.
+        The client may send this event at any time to update any field,
+        except for `voice`. However, note that once a session has been
+        initialized with a particular `model`, it can’t be changed to
+        another model using `session.update`.
 
-        The client may
-        send this event at any time to update the session configuration, and any
-        field may be updated at any time, except for "voice". The server will respond
-        with a `session.updated` event that shows the full effective configuration.
-        Only fields that are present are updated, thus the correct way to clear a
-        field like "instructions" is to pass an empty string.
+        When the server receives a `session.update`, it will respond
+        with a `session.updated` event showing the full, effective configuration.
+        Only the fields that are present are updated. To clear a field like
+        `instructions`, pass an empty string.
         """
         self._connection.send(
             cast(
@@ -768,14 +771,17 @@ class AsyncRealtimeSessionResource(BaseAsyncRealtimeConnectionResource):
     async def update(
         self, *, session: session_update_event_param.Session, event_id: str | NotGiven = NOT_GIVEN
     ) -> None:
-        """Send this event to update the session’s default configuration.
-
-        The client may
-        send this event at any time to update the session configuration, and any
-        field may be updated at any time, except for "voice". The server will respond
-        with a `session.updated` event that shows the full effective configuration.
-        Only fields that are present are updated, thus the correct way to clear a
-        field like "instructions" is to pass an empty string.
+        """
+        Send this event to update the session’s default configuration.
+        The client may send this event at any time to update any field,
+        except for `voice`. However, note that once a session has been
+        initialized with a particular `model`, it can’t be changed to
+        another model using `session.update`.
+
+        When the server receives a `session.update`, it will respond
+        with a `session.updated` event showing the full, effective configuration.
+        Only the fields that are present are updated. To clear a field like
+        `instructions`, pass an empty string.
         """
         await self._connection.send(
             cast(
diff --git a/src/openai/types/beta/assistant_update_params.py b/src/openai/types/beta/assistant_update_params.py
index 80fec110cd..12a57a4063 100644
--- a/src/openai/types/beta/assistant_update_params.py
+++ b/src/openai/types/beta/assistant_update_params.py
@@ -45,6 +45,8 @@ class AssistantUpdateParams(TypedDict, total=False):
             "gpt-4o-2024-05-13",
             "gpt-4o-mini",
             "gpt-4o-mini-2024-07-18",
+            "gpt-4.5-preview",
+            "gpt-4.5-preview-2025-02-27",
             "gpt-4-turbo",
             "gpt-4-turbo-2024-04-09",
             "gpt-4-0125-preview",
diff --git a/src/openai/types/beta/realtime/session.py b/src/openai/types/beta/realtime/session.py
index 2d028f817c..aee20fa906 100644
--- a/src/openai/types/beta/realtime/session.py
+++ b/src/openai/types/beta/realtime/session.py
@@ -34,6 +34,20 @@ class Tool(BaseModel):
 
 
 class TurnDetection(BaseModel):
+    create_response: Optional[bool] = None
+    """Whether or not to automatically generate a response when a VAD stop event
+    occurs.
+
+    `true` by default.
+    """
+
+    interrupt_response: Optional[bool] = None
+    """
+    Whether or not to automatically interrupt any ongoing response with output to
+    the default conversation (i.e. `conversation` of `auto`) when a VAD start event
+    occurs. `true` by default.
+    """
+
     prefix_padding_ms: Optional[int] = None
     """Amount of audio to include before the VAD detected speech (in milliseconds).
 
diff --git a/src/openai/types/beta/realtime/session_create_params.py b/src/openai/types/beta/realtime/session_create_params.py
index 1502d83d39..bbc86d7c7d 100644
--- a/src/openai/types/beta/realtime/session_create_params.py
+++ b/src/openai/types/beta/realtime/session_create_params.py
@@ -146,11 +146,19 @@ class Tool(TypedDict, total=False):
 
 class TurnDetection(TypedDict, total=False):
     create_response: bool
-    """Whether or not to automatically generate a response when VAD is enabled.
+    """Whether or not to automatically generate a response when a VAD stop event
+    occurs.
 
     `true` by default.
     """
 
+    interrupt_response: bool
+    """
+    Whether or not to automatically interrupt any ongoing response with output to
+    the default conversation (i.e. `conversation` of `auto`) when a VAD start event
+    occurs. `true` by default.
+    """
+
     prefix_padding_ms: int
     """Amount of audio to include before the VAD detected speech (in milliseconds).
 
diff --git a/src/openai/types/beta/realtime/session_update_event.py b/src/openai/types/beta/realtime/session_update_event.py
index 62fb0a3998..999cd8d660 100644
--- a/src/openai/types/beta/realtime/session_update_event.py
+++ b/src/openai/types/beta/realtime/session_update_event.py
@@ -51,11 +51,19 @@ class SessionTool(BaseModel):
 
 class SessionTurnDetection(BaseModel):
     create_response: Optional[bool] = None
-    """Whether or not to automatically generate a response when VAD is enabled.
+    """Whether or not to automatically generate a response when a VAD stop event
+    occurs.
 
     `true` by default.
     """
 
+    interrupt_response: Optional[bool] = None
+    """
+    Whether or not to automatically interrupt any ongoing response with output to
+    the default conversation (i.e. `conversation` of `auto`) when a VAD start event
+    occurs. `true` by default.
+    """
+
     prefix_padding_ms: Optional[int] = None
     """Amount of audio to include before the VAD detected speech (in milliseconds).
 
diff --git a/src/openai/types/beta/realtime/session_update_event_param.py b/src/openai/types/beta/realtime/session_update_event_param.py
index 133cdd91a1..07fdba9d85 100644
--- a/src/openai/types/beta/realtime/session_update_event_param.py
+++ b/src/openai/types/beta/realtime/session_update_event_param.py
@@ -57,11 +57,19 @@ class SessionTool(TypedDict, total=False):
 
 class SessionTurnDetection(TypedDict, total=False):
     create_response: bool
-    """Whether or not to automatically generate a response when VAD is enabled.
+    """Whether or not to automatically generate a response when a VAD stop event
+    occurs.
 
     `true` by default.
     """
 
+    interrupt_response: bool
+    """
+    Whether or not to automatically interrupt any ongoing response with output to
+    the default conversation (i.e. `conversation` of `auto`) when a VAD start event
+    occurs. `true` by default.
+    """
+
     prefix_padding_ms: int
     """Amount of audio to include before the VAD detected speech (in milliseconds).
 
diff --git a/src/openai/types/chat_model.py b/src/openai/types/chat_model.py
index c191cb9734..6fe705a0b4 100644
--- a/src/openai/types/chat_model.py
+++ b/src/openai/types/chat_model.py
@@ -13,6 +13,8 @@
     "o1-preview-2024-09-12",
     "o1-mini",
     "o1-mini-2024-09-12",
+    "gpt-4.5-preview",
+    "gpt-4.5-preview-2025-02-27",
     "gpt-4o",
     "gpt-4o-2024-11-20",
     "gpt-4o-2024-08-06",
diff --git a/src/openai/types/file_object.py b/src/openai/types/file_object.py
index 6e2bf310a4..1d65e6987d 100644
--- a/src/openai/types/file_object.py
+++ b/src/openai/types/file_object.py
@@ -40,6 +40,9 @@ class FileObject(BaseModel):
     `error`.
     """
 
+    expires_at: Optional[int] = None
+    """The Unix timestamp (in seconds) for when the file will expire."""
+
     status_details: Optional[str] = None
     """Deprecated.
 
diff --git a/src/openai/types/upload.py b/src/openai/types/upload.py
index d8108c62f9..914b69a863 100644
--- a/src/openai/types/upload.py
+++ b/src/openai/types/upload.py
@@ -20,7 +20,7 @@ class Upload(BaseModel):
     """The Unix timestamp (in seconds) for when the Upload was created."""
 
     expires_at: int
-    """The Unix timestamp (in seconds) for when the Upload was created."""
+    """The Unix timestamp (in seconds) for when the Upload will expire."""
 
     filename: str
     """The name of the file to be uploaded."""
diff --git a/tests/api_resources/beta/realtime/test_sessions.py b/tests/api_resources/beta/realtime/test_sessions.py
index 5a17088ce6..5ea308ca0d 100644
--- a/tests/api_resources/beta/realtime/test_sessions.py
+++ b/tests/api_resources/beta/realtime/test_sessions.py
@@ -48,6 +48,7 @@ def test_method_create_with_all_params(self, client: OpenAI) -> None:
             ],
             turn_detection={
                 "create_response": True,
+                "interrupt_response": True,
                 "prefix_padding_ms": 0,
                 "silence_duration_ms": 0,
                 "threshold": 0,
@@ -112,6 +113,7 @@ async def test_method_create_with_all_params(self, async_client: AsyncOpenAI) ->
             ],
             turn_detection={
                 "create_response": True,
+                "interrupt_response": True,
                 "prefix_padding_ms": 0,
                 "silence_duration_ms": 0,
                 "threshold": 0,