diff --git a/backend/app/rag/llm_option.py b/backend/app/rag/llm_option.py
index fa80fc23..c1564270 100644
--- a/backend/app/rag/llm_option.py
+++ b/backend/app/rag/llm_option.py
@@ -8,6 +8,7 @@ class LLMOption(BaseModel):
     provider: LLMProvider
     default_model: str
     model_description: str
+    default_credentials: str | dict = ""
     credentials_display_name: str
     credentials_description: str
     credentials_type: str = "str"
@@ -21,6 +22,7 @@ class LLMOption(BaseModel):
         credentials_display_name="OpenAI API Key",
         credentials_description="The API key of OpenAI, you can find it in https://platform.openai.com/api-keys",
         credentials_type="str",
+        default_credentials="sk-****",
     ),
     LLMOption(
         provider=LLMProvider.GEMINI,
@@ -29,6 +31,7 @@ class LLMOption(BaseModel):
         credentials_display_name="Google API Key",
         credentials_description="The API key of Google AI Studio, you can find it in https://aistudio.google.com/app/apikey",
         credentials_type="str",
+        default_credentials="AIza****",
     ),
     LLMOption(
         provider=LLMProvider.ANTHROPIC_VERTEX,
@@ -37,5 +40,10 @@ class LLMOption(BaseModel):
         credentials_display_name="Google Credentials JSON",
         credentials_description="The JSON Object of Google Credentials, refer to https://cloud.google.com/docs/authentication/provide-credentials-adc#on-prem",
         credentials_type="dict",
+        default_credentials={
+            "type": "service_account",
+            "project_id": "****",
+            "private_key_id": "****",
+        },
     ),
 ]