diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 288087c17b..c5fe8ab6d6 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "2.24.0"
+  ".": "2.25.0"
 }
\ No newline at end of file
diff --git a/.stats.yml b/.stats.yml
index 476a5b7658..4cad4cab9d 100644
--- a/.stats.yml
+++ b/.stats.yml
@@ -1,4 +1,4 @@
 configured_endpoints: 148
-openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/openai%2Fopenai-6bfe886b5ded0fe3bf37ca672698814e16e0836a093ceef65dac37ae44d1ad6b.yml
-openapi_spec_hash: 6b1344a59044318e824c8d1af96033c7
-config_hash: 7f49c38fa3abe9b7038ffe62262c4912
+openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/openai%2Fopenai-b879fff3f51e71e4f1ce17f03efc017a46d888a1bfd88eb655a6210a86f02acf.yml
+openapi_spec_hash: cbf649cc2c944fb3f77450ec752ab1e9
+config_hash: 98b0cef9ae8aa65d4a2c6df50d044379
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 91da3fc859..e2e2e37a0a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,20 @@
 # Changelog
 
+## 2.25.0 (2026-02-28)
+
+Full Changelog: [v2.24.0...v2.25.0](https://github.com/openai/openai-python/compare/v2.24.0...v2.25.0)
+
+### Features
+
+* **api:** remove prompt_cache_key param from responses, phase field from message types ([44fb382](https://github.com/openai/openai-python/commit/44fb382698872d98d5f72c880b47846c7b594f4f))
+
+
+### Bug Fixes
+
+* **api:** internal schema fixes ([0c0f970](https://github.com/openai/openai-python/commit/0c0f970cbd164131bf06f7ab38f170bbcb323683))
+* **api:** manual updates ([9fc323f](https://github.com/openai/openai-python/commit/9fc323f4da6cfca9de194e12c1486a3cd1bfa4b5))
+* **api:** readd phase ([1b27b5a](https://github.com/openai/openai-python/commit/1b27b5a834f5cb75f80c597259d0df0352ba83bd))
+
 ## 2.24.0 (2026-02-24)
 
 Full Changelog: [v2.23.0...v2.24.0](https://github.com/openai/openai-python/compare/v2.23.0...v2.24.0)
diff --git a/pyproject.toml b/pyproject.toml
index 49ab3668e8..f7aae6cbdb 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "openai"
-version = "2.24.0"
+version = "2.25.0"
 description = "The official Python library for the openai API"
 dynamic = ["readme"]
 license = "Apache-2.0"
diff --git a/src/openai/_version.py b/src/openai/_version.py
index 08cf29390a..417b40c283 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__ = "2.24.0"  # x-release-please-version
+__version__ = "2.25.0"  # x-release-please-version
diff --git a/src/openai/types/responses/easy_input_message.py b/src/openai/types/responses/easy_input_message.py
index 6f4d782734..7a45f2bce9 100644
--- a/src/openai/types/responses/easy_input_message.py
+++ b/src/openai/types/responses/easy_input_message.py
@@ -31,7 +31,11 @@ class EasyInputMessage(BaseModel):
     """
 
     phase: Optional[Literal["commentary", "final_answer"]] = None
-    """The phase of an assistant message.
+    """
+    Labels an `assistant` message as intermediate commentary (`commentary`) or the
+    final answer (`final_answer`). For models like `gpt-5.3-codex` and beyond, when
+    sending follow-up requests, preserve and resend phase on all assistant messages
+    — dropping it can degrade performance. Not used for user messages.
 
     Use `commentary` for an intermediate assistant message and `final_answer` for
     the final assistant message. For follow-up requests with models like
diff --git a/src/openai/types/responses/easy_input_message_param.py b/src/openai/types/responses/easy_input_message_param.py
index f7eb42ba71..7048e2034b 100644
--- a/src/openai/types/responses/easy_input_message_param.py
+++ b/src/openai/types/responses/easy_input_message_param.py
@@ -32,7 +32,11 @@ class EasyInputMessageParam(TypedDict, total=False):
     """
 
     phase: Optional[Literal["commentary", "final_answer"]]
-    """The phase of an assistant message.
+    """
+    Labels an `assistant` message as intermediate commentary (`commentary`) or the
+    final answer (`final_answer`). For models like `gpt-5.3-codex` and beyond, when
+    sending follow-up requests, preserve and resend phase on all assistant messages
+    — dropping it can degrade performance. Not used for user messages.
 
     Use `commentary` for an intermediate assistant message and `final_answer` for
     the final assistant message. For follow-up requests with models like
diff --git a/src/openai/types/responses/response_output_message.py b/src/openai/types/responses/response_output_message.py
index a8720e1c57..62f0ed437f 100644
--- a/src/openai/types/responses/response_output_message.py
+++ b/src/openai/types/responses/response_output_message.py
@@ -36,7 +36,11 @@ class ResponseOutputMessage(BaseModel):
     """The type of the output message. Always `message`."""
 
     phase: Optional[Literal["commentary", "final_answer"]] = None
-    """The phase of an assistant message.
+    """
+    Labels an `assistant` message as intermediate commentary (`commentary`) or the
+    final answer (`final_answer`). For models like `gpt-5.3-codex` and beyond, when
+    sending follow-up requests, preserve and resend phase on all assistant messages
+    — dropping it can degrade performance. Not used for user messages.
 
     Use `commentary` for an intermediate assistant message and `final_answer` for
     the final assistant message. For follow-up requests with models like
diff --git a/src/openai/types/responses/response_output_message_param.py b/src/openai/types/responses/response_output_message_param.py
index 5d488d8c6b..20c1384739 100644
--- a/src/openai/types/responses/response_output_message_param.py
+++ b/src/openai/types/responses/response_output_message_param.py
@@ -36,7 +36,11 @@ class ResponseOutputMessageParam(TypedDict, total=False):
     """The type of the output message. Always `message`."""
 
     phase: Optional[Literal["commentary", "final_answer"]]
-    """The phase of an assistant message.
+    """
+    Labels an `assistant` message as intermediate commentary (`commentary`) or the
+    final answer (`final_answer`). For models like `gpt-5.3-codex` and beyond, when
+    sending follow-up requests, preserve and resend phase on all assistant messages
+    — dropping it can degrade performance. Not used for user messages.
 
     Use `commentary` for an intermediate assistant message and `final_answer` for
     the final assistant message. For follow-up requests with models like