diff --git a/slack_sdk/web/async_client.py b/slack_sdk/web/async_client.py
index c0ae0bfcf..108ebe09d 100644
--- a/slack_sdk/web/async_client.py
+++ b/slack_sdk/web/async_client.py
@@ -2091,13 +2091,24 @@ async def assistant_threads_setStatus(
         thread_ts: str,
         status: str,
         loading_messages: Optional[List[str]] = None,
+        icon_emoji: Optional[str] = None,
+        icon_url: Optional[str] = None,
+        username: Optional[str] = None,
         **kwargs,
     ) -> AsyncSlackResponse:
         """Set the status for an AI assistant thread.
         https://docs.slack.dev/reference/methods/assistant.threads.setStatus
         """
         kwargs.update(
-            {"channel_id": channel_id, "thread_ts": thread_ts, "status": status, "loading_messages": loading_messages}
+            {
+                "channel_id": channel_id,
+                "thread_ts": thread_ts,
+                "status": status,
+                "loading_messages": loading_messages,
+                "icon_emoji": icon_emoji,
+                "icon_url": icon_url,
+                "username": username,
+            }
         )
         kwargs = _remove_none_values(kwargs)
         return await self.api_call("assistant.threads.setStatus", json=kwargs)
@@ -2903,6 +2914,9 @@ async def chat_startStream(
         recipient_user_id: Optional[str] = None,
         chunks: Optional[Sequence[Union[Dict, Chunk]]] = None,
         task_display_mode: Optional[str] = None,  # timeline, plan
+        icon_emoji: Optional[str] = None,
+        icon_url: Optional[str] = None,
+        username: Optional[str] = None,
         **kwargs,
     ) -> AsyncSlackResponse:
         """Starts a new streaming conversation.
@@ -2917,6 +2931,9 @@ async def chat_startStream(
                 "recipient_user_id": recipient_user_id,
                 "chunks": chunks,
                 "task_display_mode": task_display_mode,
+                "icon_emoji": icon_emoji,
+                "icon_url": icon_url,
+                "username": username,
             }
         )
         _parse_web_class_objects(kwargs)
diff --git a/slack_sdk/web/client.py b/slack_sdk/web/client.py
index 9f7360849..940d8fbb2 100644
--- a/slack_sdk/web/client.py
+++ b/slack_sdk/web/client.py
@@ -2081,13 +2081,24 @@ def assistant_threads_setStatus(
         thread_ts: str,
         status: str,
         loading_messages: Optional[List[str]] = None,
+        icon_emoji: Optional[str] = None,
+        icon_url: Optional[str] = None,
+        username: Optional[str] = None,
         **kwargs,
     ) -> SlackResponse:
         """Set the status for an AI assistant thread.
         https://docs.slack.dev/reference/methods/assistant.threads.setStatus
         """
         kwargs.update(
-            {"channel_id": channel_id, "thread_ts": thread_ts, "status": status, "loading_messages": loading_messages}
+            {
+                "channel_id": channel_id,
+                "thread_ts": thread_ts,
+                "status": status,
+                "loading_messages": loading_messages,
+                "icon_emoji": icon_emoji,
+                "icon_url": icon_url,
+                "username": username,
+            }
         )
         kwargs = _remove_none_values(kwargs)
         return self.api_call("assistant.threads.setStatus", json=kwargs)
@@ -2893,6 +2904,9 @@ def chat_startStream(
         recipient_user_id: Optional[str] = None,
         chunks: Optional[Sequence[Union[Dict, Chunk]]] = None,
         task_display_mode: Optional[str] = None,  # timeline, plan
+        icon_emoji: Optional[str] = None,
+        icon_url: Optional[str] = None,
+        username: Optional[str] = None,
         **kwargs,
     ) -> SlackResponse:
         """Starts a new streaming conversation.
@@ -2907,6 +2921,9 @@ def chat_startStream(
                 "recipient_user_id": recipient_user_id,
                 "chunks": chunks,
                 "task_display_mode": task_display_mode,
+                "icon_emoji": icon_emoji,
+                "icon_url": icon_url,
+                "username": username,
             }
         )
         _parse_web_class_objects(kwargs)
diff --git a/slack_sdk/web/legacy_client.py b/slack_sdk/web/legacy_client.py
index 8d3b65353..db785bbbc 100644
--- a/slack_sdk/web/legacy_client.py
+++ b/slack_sdk/web/legacy_client.py
@@ -2092,13 +2092,24 @@ def assistant_threads_setStatus(
         thread_ts: str,
         status: str,
         loading_messages: Optional[List[str]] = None,
+        icon_emoji: Optional[str] = None,
+        icon_url: Optional[str] = None,
+        username: Optional[str] = None,
         **kwargs,
     ) -> Union[Future, SlackResponse]:
         """Set the status for an AI assistant thread.
         https://docs.slack.dev/reference/methods/assistant.threads.setStatus
         """
         kwargs.update(
-            {"channel_id": channel_id, "thread_ts": thread_ts, "status": status, "loading_messages": loading_messages}
+            {
+                "channel_id": channel_id,
+                "thread_ts": thread_ts,
+                "status": status,
+                "loading_messages": loading_messages,
+                "icon_emoji": icon_emoji,
+                "icon_url": icon_url,
+                "username": username,
+            }
         )
         kwargs = _remove_none_values(kwargs)
         return self.api_call("assistant.threads.setStatus", json=kwargs)
@@ -2904,6 +2915,9 @@ def chat_startStream(
         recipient_user_id: Optional[str] = None,
         chunks: Optional[Sequence[Union[Dict, Chunk]]] = None,
         task_display_mode: Optional[str] = None,  # timeline, plan
+        icon_emoji: Optional[str] = None,
+        icon_url: Optional[str] = None,
+        username: Optional[str] = None,
         **kwargs,
     ) -> Union[Future, SlackResponse]:
         """Starts a new streaming conversation.
@@ -2918,6 +2932,9 @@ def chat_startStream(
                 "recipient_user_id": recipient_user_id,
                 "chunks": chunks,
                 "task_display_mode": task_display_mode,
+                "icon_emoji": icon_emoji,
+                "icon_url": icon_url,
+                "username": username,
             }
         )
         _parse_web_class_objects(kwargs)
diff --git a/tests/slack_sdk_async/web/test_web_client_coverage.py b/tests/slack_sdk_async/web/test_web_client_coverage.py
index 805d0129f..7a16ee61a 100644
--- a/tests/slack_sdk_async/web/test_web_client_coverage.py
+++ b/tests/slack_sdk_async/web/test_web_client_coverage.py
@@ -441,6 +441,19 @@ async def run_method(self, method_name, method, async_method):
                     status="is typing...",
                     loading_states=["Thinking...", "Writing..."],
                 )
+                method(
+                    channel_id="D111",
+                    thread_ts="111.222",
+                    status="counting...",
+                    username="Abacus",
+                    icon_emoji="abacus",
+                )
+                await async_method(
+                    channel_id="D111",
+                    thread_ts="111.222",
+                    status="dreaming...",
+                    icon_url="https://example.com/clouds-square.png",
+                )
             elif method_name == "assistant_threads_setTitle":
                 self.api_methods_to_call.remove(method(channel_id="D111", thread_ts="111.222", title="New chat")["method"])
                 await async_method(channel_id="D111", thread_ts="111.222", title="New chat")
@@ -587,6 +600,21 @@ async def run_method(self, method_name, method, async_method):
                 await async_method(channel="C123", thread_ts="123.123")
                 method(channel="C123", thread_ts="123.123", recipient_team_id="T123", recipient_user_id="U123")
                 await async_method(channel="C123", thread_ts="123.123", recipient_team_id="T123", recipient_user_id="U123")
+                method(
+                    channel="C123",
+                    thread_ts="123.123",
+                    recipient_team_id="T123",
+                    recipient_user_id="U123",
+                    username="Abacus",
+                    icon_emoji="abacus",
+                )
+                await async_method(
+                    channel="C123",
+                    thread_ts="123.123",
+                    recipient_team_id="T123",
+                    recipient_user_id="U123",
+                    icon_url="https://example.com/clouds-square.png",
+                )
             elif method_name == "chat_stopStream":
                 self.api_methods_to_call.remove(
                     method(channel="C123", ts="123.123", blocks=[{"type": "markdown", "text": "**twelve**"}])["method"]