diff --git a/app/src/utils/render_audiocast_utils.py b/app/src/utils/render_audiocast_utils.py
index a0188a8..0f9ea67 100644
--- a/app/src/utils/render_audiocast_utils.py
+++ b/app/src/utils/render_audiocast_utils.py
@@ -1,36 +1,16 @@
 import re
 from pathlib import Path
-from typing import TypedDict, cast
+from typing import cast
 
 import httpx
 import streamlit as st
-from pydantic import BaseModel
 from src.utils.render_waveform import render_waveform
 
 from env_var import APP_URL, SERVER_URL
+from utils_pkg.audiocast_utils import GenerateAudiocastDict, GenerateAudioCastRequest
 from utils_pkg.chat_utils import ContentCategory
 
 
-class GenerateAudioCastRequest(BaseModel):
-    sessionId: str
-    summary: str
-    category: str
-
-
-class GenerateAudioCastResponse(BaseModel):
-    url: str
-    script: str
-    source_content: str
-    created_at: str | None
-
-
-class GenerateAudiocastDict(TypedDict):
-    url: str
-    script: str
-    source_content: str
-    created_at: str | None
-
-
 def navigate_to_home():
     main_script = str(Path(__file__).parent.parent / "app.py")
     st.switch_page(main_script)
diff --git a/server/src/utils/generate_audiocast.py b/server/src/utils/generate_audiocast.py
index b7f2cdf..5777e52 100644
--- a/server/src/utils/generate_audiocast.py
+++ b/server/src/utils/generate_audiocast.py
@@ -1,30 +1,18 @@
 from datetime import datetime
-from typing import Optional
 
 from fastapi import BackgroundTasks, HTTPException
-from pydantic import BaseModel
 
 from services.storage import StorageManager
 from utils_pkg.audio_manager import AudioManager, AudioManagerConfig
 from utils_pkg.audiocast_request import AudioScriptMaker, generate_source_content
-from utils_pkg.chat_utils import ContentCategory
+from utils_pkg.audiocast_utils import (
+    GenerateAudioCastRequest,
+    GenerateAudioCastResponse,
+)
 from utils_pkg.session_manager import SessionManager
 from utils_pkg.waveform_utils import WaveformUtils
 
 
-class GenerateAudioCastRequest(BaseModel):
-    sessionId: str
-    summary: str
-    category: ContentCategory
-
-
-class GenerateAudioCastResponse(BaseModel):
-    url: str
-    script: str
-    source_content: str
-    created_at: Optional[str]
-
-
 async def generate_audiocast(
     request: GenerateAudioCastRequest, background_tasks: BackgroundTasks
 ):
diff --git a/utils_pkg/audiocast_utils.py b/utils_pkg/audiocast_utils.py
new file mode 100644
index 0000000..d346915
--- /dev/null
+++ b/utils_pkg/audiocast_utils.py
@@ -0,0 +1,25 @@
+from typing import TypedDict
+
+from pydantic import BaseModel
+
+from utils_pkg.chat_utils import ContentCategory
+
+
+class GenerateAudioCastRequest(BaseModel):
+    sessionId: str
+    summary: str
+    category: ContentCategory
+
+
+class GenerateAudioCastResponse(BaseModel):
+    url: str
+    script: str
+    source_content: str
+    created_at: str | None
+
+
+class GenerateAudiocastDict(TypedDict):
+    url: str
+    script: str
+    source_content: str
+    created_at: str | None