diff --git a/app/components/DocsAssistant.tsx b/app/components/DocsAssistant.tsx
index 60e2af6..0849751 100644
--- a/app/components/DocsAssistant.tsx
+++ b/app/components/DocsAssistant.tsx
@@ -1,6 +1,6 @@
 "use client";
 
-import { useCallback, useEffect, useMemo } from "react";
+import { useCallback, useEffect, useMemo, useRef } from "react";
 
 import { AssistantRuntimeProvider } from "@assistant-ui/react";
 import { useAISDKRuntime } from "@assistant-ui/react-ai-sdk";
@@ -49,13 +49,13 @@ function DocsAssistantInner({ pageContext }: DocsAssistantProps) {
           return { pageContext, provider, apiKey };
         },
       }),
-    [geminiApiKey, openaiApiKey, pageContext, provider],
+    [pageContext, provider, openaiApiKey, geminiApiKey],
   );
 
   const chat = useChat({
     transport,
     onFinish: () => {
-      // 当对话结束时（流式传输完成），记录一次查询行为
+      // Track AI query when chat finishes (streaming completes)
       if (window.umami) {
         window.umami.track("ai_assistant_query");
       }
@@ -68,6 +68,11 @@ function DocsAssistantInner({ pageContext }: DocsAssistantProps) {
     clearError: clearChatError,
   } = chat;
 
+  // Clear previous error when Provider changes
+  useEffect(() => {
+    clearChatError();
+  }, [provider, clearChatError]);
+
   useEffect(() => {
     if (chatStatus === "submitted" || chatStatus === "streaming") {
       clearChatError();
diff --git a/app/hooks/useAssistantSettings.tsx b/app/hooks/useAssistantSettings.tsx
index da78c48..c82ab8e 100644
--- a/app/hooks/useAssistantSettings.tsx
+++ b/app/hooks/useAssistantSettings.tsx
@@ -16,7 +16,7 @@ interface AssistantSettingsState {
   provider: Provider;
   openaiApiKey: string;
   geminiApiKey: string;
-  saveToLocalStorage: boolean; // 是否将API Key保存到localStorage
+  saveToLocalStorage: boolean; // Whether to save API keys to localStorage
 }
 
 interface AssistantSettingsContextValue extends AssistantSettingsState {
@@ -30,7 +30,7 @@ interface AssistantSettingsContextValue extends AssistantSettingsState {
 const SETTINGS_KEY = "assistant-settings-storage";
 
 const defaultSettings: AssistantSettingsState = {
-  provider: "openai",
+  provider: "intern",
   openaiApiKey: "",
   geminiApiKey: "",
   saveToLocalStorage: false,
@@ -56,7 +56,7 @@ const parseStoredSettings = (raw: string | null): AssistantSettingsState => {
           : parsed.provider === "intern"
             ? "intern"
             : "openai",
-      // 只有在saveToLocalStorage为true时才使用存储的key
+      // Use only stored key if saveToLocalStorage is true
       openaiApiKey:
         saveToLocalStorage && typeof parsed.openaiApiKey === "string"
           ? parsed.openaiApiKey
@@ -100,7 +100,7 @@ export const AssistantSettingsProvider = ({
     }
 
     try {
-      // 根据saveToLocalStorage决定是否保存API key
+      // Decide whether to save API keys based on saveToLocalStorage
       const dataToSave = settings.saveToLocalStorage
         ? settings
         : {