diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index fac1407..7c31fce 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.1.0-alpha.20"
+  ".": "0.1.0-alpha.21"
 }
\ No newline at end of file
diff --git a/.stats.yml b/.stats.yml
index bab7aeb..5ccf547 100644
--- a/.stats.yml
+++ b/.stats.yml
@@ -1,4 +1,4 @@
 configured_endpoints: 22
-openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/opencode%2Fopencode-f9a2ce0fd0addc365614ef8c4bb1746f5ba14bc92f3d01f4cd85fb3b33a8d975.yml
-openapi_spec_hash: c58dec8e5250d41f216cded6afb763af
-config_hash: b7f3d9742335715c458494988498b183
+openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/opencode%2Fopencode-186e713234760e9f755b35c78809f89378e4f778a451cd5e30649f41489e0bfd.yml
+openapi_spec_hash: 5fb2ce9d8055253d597567a8a3293e73
+config_hash: a8441af7cb2db855d79fd372ee3b9fb1
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9420e1a..2281cd3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog
 
+## 0.1.0-alpha.21 (2025-07-17)
+
+Full Changelog: [v0.1.0-alpha.20...v0.1.0-alpha.21](https://github.com/sst/opencode-sdk-python/compare/v0.1.0-alpha.20...v0.1.0-alpha.21)
+
+### Features
+
+* **api:** api update ([71211e8](https://github.com/sst/opencode-sdk-python/commit/71211e888ecd5e848ac4de5ed058e4756025f694))
+
 ## 0.1.0-alpha.20 (2025-07-17)
 
 Full Changelog: [v0.1.0-alpha.19...v0.1.0-alpha.20](https://github.com/sst/opencode-sdk-python/compare/v0.1.0-alpha.19...v0.1.0-alpha.20)
diff --git a/api.md b/api.md
index 8ba2145..917b959 100644
--- a/api.md
+++ b/api.md
@@ -102,6 +102,7 @@ Types:
 from opencode_ai.types import (
     AssistantMessage,
     FilePart,
+    FilePartInput,
     Message,
     Part,
     Session,
@@ -109,6 +110,7 @@ from opencode_ai.types import (
     StepFinishPart,
     StepStartPart,
     TextPart,
+    TextPartInput,
     ToolPart,
     ToolStateCompleted,
     ToolStateError,
diff --git a/pyproject.toml b/pyproject.toml
index 420f74f..06248ca 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "opencode-ai"
-version = "0.1.0-alpha.20"
+version = "0.1.0-alpha.21"
 description = "The official Python library for the opencode API"
 dynamic = ["readme"]
 license = "Apache-2.0"
diff --git a/src/opencode_ai/_version.py b/src/opencode_ai/_version.py
index ac3c99b..2d60c92 100644
--- a/src/opencode_ai/_version.py
+++ b/src/opencode_ai/_version.py
@@ -1,4 +1,4 @@
 # File generated from our OpenAPI spec by Stainless. See CONTRIBUTING.md for details.
 
 __title__ = "opencode_ai"
-__version__ = "0.1.0-alpha.20"  # x-release-please-version
+__version__ = "0.1.0-alpha.21"  # x-release-please-version
diff --git a/src/opencode_ai/types/__init__.py b/src/opencode_ai/types/__init__.py
index 801de7d..58c00ae 100644
--- a/src/opencode_ai/types/__init__.py
+++ b/src/opencode_ai/types/__init__.py
@@ -51,9 +51,11 @@
 from .session_init_params import SessionInitParams as SessionInitParams
 from .file_status_response import FileStatusResponse as FileStatusResponse
 from .tool_state_completed import ToolStateCompleted as ToolStateCompleted
+from .file_part_input_param import FilePartInputParam as FilePartInputParam
 from .find_symbols_response import FindSymbolsResponse as FindSymbolsResponse
 from .session_init_response import SessionInitResponse as SessionInitResponse
 from .session_list_response import SessionListResponse as SessionListResponse
+from .text_part_input_param import TextPartInputParam as TextPartInputParam
 from .app_providers_response import AppProvidersResponse as AppProvidersResponse
 from .session_abort_response import SessionAbortResponse as SessionAbortResponse
 from .session_delete_response import SessionDeleteResponse as SessionDeleteResponse
diff --git a/src/opencode_ai/types/file_part_input_param.py b/src/opencode_ai/types/file_part_input_param.py
new file mode 100644
index 0000000..53002cc
--- /dev/null
+++ b/src/opencode_ai/types/file_part_input_param.py
@@ -0,0 +1,19 @@
+# File generated from our OpenAPI spec by Stainless. See CONTRIBUTING.md for details.
+
+from __future__ import annotations
+
+from typing_extensions import Literal, Required, TypedDict
+
+__all__ = ["FilePartInputParam"]
+
+
+class FilePartInputParam(TypedDict, total=False):
+    mime: Required[str]
+
+    type: Required[Literal["file"]]
+
+    url: Required[str]
+
+    id: str
+
+    filename: str
diff --git a/src/opencode_ai/types/session_chat_params.py b/src/opencode_ai/types/session_chat_params.py
index 7475317..1d2bc4b 100644
--- a/src/opencode_ai/types/session_chat_params.py
+++ b/src/opencode_ai/types/session_chat_params.py
@@ -3,11 +3,13 @@
 from __future__ import annotations
 
 from typing import Union, Iterable
-from typing_extensions import Literal, Required, Annotated, TypeAlias, TypedDict
+from typing_extensions import Required, Annotated, TypeAlias, TypedDict
 
 from .._utils import PropertyInfo
+from .file_part_input_param import FilePartInputParam
+from .text_part_input_param import TextPartInputParam
 
-__all__ = ["SessionChatParams", "Part", "PartUnionMember0", "PartUnionMember0Time", "PartUnionMember1"]
+__all__ = ["SessionChatParams", "Part"]
 
 
 class SessionChatParams(TypedDict, total=False):
@@ -24,34 +26,4 @@ class SessionChatParams(TypedDict, total=False):
     mode: str
 
 
-class PartUnionMember0Time(TypedDict, total=False):
-    start: Required[float]
-
-    end: float
-
-
-class PartUnionMember0(TypedDict, total=False):
-    text: Required[str]
-
-    type: Required[Literal["text"]]
-
-    id: str
-
-    synthetic: bool
-
-    time: PartUnionMember0Time
-
-
-class PartUnionMember1(TypedDict, total=False):
-    mime: Required[str]
-
-    type: Required[Literal["file"]]
-
-    url: Required[str]
-
-    id: str
-
-    filename: str
-
-
-Part: TypeAlias = Union[PartUnionMember0, PartUnionMember1]
+Part: TypeAlias = Union[TextPartInputParam, FilePartInputParam]
diff --git a/src/opencode_ai/types/text_part_input_param.py b/src/opencode_ai/types/text_part_input_param.py
new file mode 100644
index 0000000..2850484
--- /dev/null
+++ b/src/opencode_ai/types/text_part_input_param.py
@@ -0,0 +1,25 @@
+# File generated from our OpenAPI spec by Stainless. See CONTRIBUTING.md for details.
+
+from __future__ import annotations
+
+from typing_extensions import Literal, Required, TypedDict
+
+__all__ = ["TextPartInputParam", "Time"]
+
+
+class Time(TypedDict, total=False):
+    start: Required[float]
+
+    end: float
+
+
+class TextPartInputParam(TypedDict, total=False):
+    text: Required[str]
+
+    type: Required[Literal["text"]]
+
+    id: str
+
+    synthetic: bool
+
+    time: Time