diff --git a/src/renderer/src/assets/images/providers/302ai.webp b/src/renderer/src/assets/images/providers/302ai.webp
new file mode 100644
index 0000000000..ba7bcc80ae
Binary files /dev/null and b/src/renderer/src/assets/images/providers/302ai.webp differ
diff --git a/src/renderer/src/assets/images/providers/cephalon.jpeg b/src/renderer/src/assets/images/providers/cephalon.jpeg
new file mode 100644
index 0000000000..8615e1c80d
Binary files /dev/null and b/src/renderer/src/assets/images/providers/cephalon.jpeg differ
diff --git a/src/renderer/src/assets/styles/markdown.scss b/src/renderer/src/assets/styles/markdown.scss
index 5b4269e2fa..033de18ab4 100644
--- a/src/renderer/src/assets/styles/markdown.scss
+++ b/src/renderer/src/assets/styles/markdown.scss
@@ -308,13 +308,16 @@ emoji-picker {
   --border-size: 0;
 }
 
-.katex-display {
+.katex,
+mjx-container {
+  display: inline-block;
   overflow-x: auto;
   overflow-y: hidden;
-}
-
-mjx-container {
-  overflow-x: auto;
+  overflow-wrap: break-word;
+  vertical-align: middle;
+  max-width: 100%;
+  padding: 1px 2px;
+  margin-top: -2px;
 }
 
 /* CodeMirror 相关样式 */
diff --git a/src/renderer/src/config/models.ts b/src/renderer/src/config/models.ts
index 07581eadb3..acebf6171c 100644
--- a/src/renderer/src/config/models.ts
+++ b/src/renderer/src/config/models.ts
@@ -429,7 +429,86 @@ export const SYSTEM_MODELS: Record<string, Model[]> = {
       group: 'deepseek-ai'
     }
   ],
-
+  '302ai': [
+    {
+      id: 'deepseek-chat',
+      name: 'deepseek-chat',
+      provider: '302ai',
+      group: 'DeepSeek'
+    },
+    {
+      id: 'deepseek-reasoner',
+      name: 'deepseek-reasoner',
+      provider: '302ai',
+      group: 'DeepSeek'
+    },
+    {
+      id: 'chatgpt-4o-latest',
+      name: 'chatgpt-4o-latest',
+      provider: '302ai',
+      group: 'OpenAI'
+    },
+    {
+      id: 'gpt-4.1',
+      name: 'gpt-4.1',
+      provider: '302ai',
+      group: 'OpenAI'
+    },
+    {
+      id: 'o3',
+      name: 'o3',
+      provider: '302ai',
+      group: 'OpenAI'
+    },
+    {
+      id: 'o4-mini',
+      name: 'o4-mini',
+      provider: '302ai',
+      group: 'OpenAI'
+    },
+    {
+      id: 'qwen3-235b-a22b',
+      name: 'qwen3-235b-a22b',
+      provider: '302ai',
+      group: 'Qwen'
+    },
+    {
+      id: 'gemini-2.5-flash-preview-05-20',
+      name: 'gemini-2.5-flash-preview-05-20',
+      provider: '302ai',
+      group: 'Gemini'
+    },
+    {
+      id: 'gemini-2.5-pro-preview-06-05',
+      name: 'gemini-2.5-pro-preview-06-05',
+      provider: '302ai',
+      group: 'Gemini'
+    },
+    {
+      id: 'claude-sonnet-4-20250514',
+      provider: '302ai',
+      name: 'claude-sonnet-4-20250514',
+      group: 'Anthropic'
+    },
+    {
+      id: 'claude-opus-4-20250514',
+      provider: '302ai',
+      name: 'claude-opus-4-20250514',
+      group: 'Anthropic'
+    },
+    {
+      id: 'jina-clip-v2',
+      name: 'jina-clip-v2',
+      provider: '302ai',
+      group: 'Jina AI'
+    },
+    {
+      id: 'jina-reranker-m0',
+      name: 'jina-reranker-m0',
+      provider: '302ai',
+      group: 'Jina AI'
+    }
+  ],
   aihubmix: [
     {
       id: 'gpt-4o',
@@ -2082,6 +2161,14 @@ export const SYSTEM_MODELS: Record<string, Model[]> = {
       name: 'Qwen Plus',
       group: 'Qwen'
     }
+  ],
+  cephalon: [
+    {
+      id: 'DeepSeek-R1',
+      provider: 'cephalon',
+      name: 'DeepSeek-R1满血版',
+      group: 'DeepSeek'
+    }
   ]
 }
 
diff --git a/src/renderer/src/config/providers.ts b/src/renderer/src/config/providers.ts
index c83522f358..629e6827fd 100644
--- a/src/renderer/src/config/providers.ts
+++ b/src/renderer/src/config/providers.ts
@@ -1,6 +1,7 @@
 import ZhinaoProviderLogo from '@renderer/assets/images/models/360.png'
 import HunyuanProviderLogo from '@renderer/assets/images/models/hunyuan.png'
 import AzureProviderLogo from '@renderer/assets/images/models/microsoft.png'
+import Ai302ProviderLogo from '@renderer/assets/images/providers/302ai.webp'
 import AiHubMixProviderLogo from '@renderer/assets/images/providers/aihubmix.webp'
 import AlayaNewProviderLogo from '@renderer/assets/images/providers/alayanew.webp'
 import AnthropicProviderLogo from '@renderer/assets/images/providers/anthropic.png'
@@ -8,6 +9,7 @@ import BaichuanProviderLogo from '@renderer/assets/images/providers/baichuan.png
 import BaiduCloudProviderLogo from '@renderer/assets/images/providers/baidu-cloud.svg'
 import BailianProviderLogo from '@renderer/assets/images/providers/bailian.png'
 import BurnCloudProviderLogo from '@renderer/assets/images/providers/burncloud.png'
+import CephalonProviderLogo from '@renderer/assets/images/providers/cephalon.jpeg'
 import DeepSeekProviderLogo from '@renderer/assets/images/providers/deepseek.png'
 import DmxapiProviderLogo from '@renderer/assets/images/providers/DMXAPI.png'
 import FireworksProviderLogo from '@renderer/assets/images/providers/fireworks.png'
@@ -48,6 +50,7 @@ import ZhipuProviderLogo from '@renderer/assets/images/providers/zhipu.png'
 import { TOKENFLUX_HOST } from './constant'
 
 const PROVIDER_LOGO_MAP = {
+  '302ai': Ai302ProviderLogo,
   openai: OpenAiProviderLogo,
   silicon: SiliconFlowProviderLogo,
   deepseek: DeepSeekProviderLogo,
@@ -94,7 +97,8 @@ const PROVIDER_LOGO_MAP = {
   alayanew: AlayaNewProviderLogo,
   voyageai: VoyageAIProviderLogo,
   qiniu: QiniuProviderLogo,
-  tokenflux: TokenFluxProviderLogo
+  tokenflux: TokenFluxProviderLogo,
+  cephalon: CephalonProviderLogo
 } as const
 
 export function getProviderLogo(providerId: string) {
@@ -106,6 +110,17 @@ export const NOT_SUPPORTED_REANK_PROVIDERS = ['ollama']
 export const ONLY_SUPPORTED_DIMENSION_PROVIDERS = ['ollama', 'infini']
 
 export const PROVIDER_CONFIG = {
+  '302ai': {
+    api: {
+      url: 'https://api.302.ai'
+    },
+    websites: {
+      official: 'https://302.ai',
+      apiKey: 'https://dash.302.ai/apis/list',
+      docs: 'https://302ai.apifox.cn/api-147522039',
+      models: 'https://302.ai/pricing/'
+    }
+  },
   openai: {
     api: {
       url: 'https://api.openai.com'
@@ -612,5 +627,16 @@ export const PROVIDER_CONFIG = {
       docs: `${TOKENFLUX_HOST}/docs`,
       models: `${TOKENFLUX_HOST}/models`
     }
+  },
+  cephalon: {
+    api: {
+      url: 'https://cephalon.cloud/user-center/v1/model'
+    },
+    websites: {
+      official: 'https://cephalon.cloud/share/register-landing?invite_id=jSdOYA',
+      apiKey: 'https://cephalon.cloud/api',
+      docs: 'https://cephalon.cloud/apitoken/1864244127731589124',
+      models: 'https://cephalon.cloud/model'
+    }
   }
 }
diff --git a/src/renderer/src/hooks/useAssistant.ts b/src/renderer/src/hooks/useAssistant.ts
index dd2d47b89f..bc9a55fbd2 100644
--- a/src/renderer/src/hooks/useAssistant.ts
+++ b/src/renderer/src/hooks/useAssistant.ts
@@ -3,24 +3,18 @@ import { getDefaultTopic } from '@renderer/services/AssistantService'
 import { useAppDispatch, useAppSelector } from '@renderer/store'
 import {
   addAssistant,
-  addTopic,
-  removeAllTopics,
   removeAssistant,
-  removeTopic,
   setModel,
   updateAssistant,
   updateAssistants,
   updateAssistantSettings,
-  updateDefaultAssistant,
-  updateTopic,
-  updateTopics
+  updateDefaultAssistant
 } from '@renderer/store/assistants'
 import { setDefaultModel, setQuickAssistantModel, setTopicNamingModel, setTranslateModel } from '@renderer/store/llm'
+import { selectTopicsForAssistant, topicsActions } from '@renderer/store/topics'
 import { Assistant, AssistantSettings, Model, Topic } from '@renderer/types'
 import { useCallback, useMemo } from 'react'
 
-import { TopicManager } from './useTopic'
-
 export function useAssistants() {
   const { assistants } = useAppSelector((state) => state.assistants)
   const dispatch = useAppDispatch()
@@ -31,15 +25,15 @@ export function useAssistants() {
     addAssistant: (assistant: Assistant) => dispatch(addAssistant(assistant)),
     removeAssistant: (id: string) => {
       dispatch(removeAssistant({ id }))
-      const assistant = assistants.find((a) => a.id === id)
-      const topics = assistant?.topics || []
-      topics.forEach(({ id }) => TopicManager.removeTopic(id))
+      // Remove all topics for this assistant
+      dispatch(topicsActions.removeAllTopics({ assistantId: id }))
     }
   }
 }
 
 export function useAssistant(id: string) {
   const assistant = useAppSelector((state) => state.assistants.assistants.find((a) => a.id === id) as Assistant)
+  const topics = useTopicsForAssistant(id)
   const dispatch = useAppDispatch()
   const { defaultModel } = useDefaultModel()
 
@@ -48,19 +42,18 @@ export function useAssistant(id: string) {
     throw new Error(`Assistant model is not set for assistant with name: ${assistant?.name ?? 'unknown'}`)
   }
 
-  const assistantWithModel = useMemo(() => ({ ...assistant, model }), [assistant, model])
+  const assistantWithModel = useMemo(() => ({ ...assistant, model, topics }), [assistant, model, topics])
 
   return {
     assistant: assistantWithModel,
     model,
-    addTopic: (topic: Topic) => dispatch(addTopic({ assistantId: assistant.id, topic })),
+    topics,
+    addTopic: (topic: Topic) => dispatch(topicsActions.addTopic({ assistantId: id, topic })),
     removeTopic: (topic: Topic) => {
-      TopicManager.removeTopic(topic.id)
-      dispatch(removeTopic({ assistantId: assistant.id, topic }))
+      dispatch(topicsActions.removeTopic({ assistantId: id, topicId: topic.id }))
     },
     moveTopic: (topic: Topic, toAssistant: Assistant) => {
-      dispatch(addTopic({ assistantId: toAssistant.id, topic: { ...topic, assistantId: toAssistant.id } }))
-      dispatch(removeTopic({ assistantId: assistant.id, topic }))
+      dispatch(topicsActions.moveTopic({ fromAssistantId: id, toAssistantId: toAssistant.id, topicId: topic.id }))
       // update topic messages in database
       db.topics
         .where('id')
@@ -74,9 +67,9 @@ export function useAssistant(id: string) {
           }
         })
     },
-    updateTopic: (topic: Topic) => dispatch(updateTopic({ assistantId: assistant.id, topic })),
-    updateTopics: (topics: Topic[]) => dispatch(updateTopics({ assistantId: assistant.id, topics })),
-    removeAllTopics: () => dispatch(removeAllTopics({ assistantId: assistant.id })),
+    updateTopic: (topic: Topic) => dispatch(topicsActions.updateTopic({ assistantId: id, topic })),
+    updateTopics: (topics: Topic[]) => dispatch(topicsActions.updateTopics({ assistantId: id, topics })),
+    removeAllTopics: () => dispatch(topicsActions.removeAllTopics({ assistantId: id })),
     setModel: useCallback(
       (model: Model) => assistant && dispatch(setModel({ assistantId: assistant?.id, model })),
       [assistant, dispatch]
@@ -88,15 +81,27 @@ export function useAssistant(id: string) {
   }
 }
 
+export function useTopicsForAssistant(assistantId: string) {
+  return useAppSelector((state) => selectTopicsForAssistant(state, assistantId))
+}
+
 export function useDefaultAssistant() {
   const defaultAssistant = useAppSelector((state) => state.assistants.defaultAssistant)
+  const topics = useTopicsForAssistant(defaultAssistant.id)
   const dispatch = useAppDispatch()
-  const memoizedTopics = useMemo(() => [getDefaultTopic(defaultAssistant.id)], [defaultAssistant.id])
+
+  // Ensure default assistant has at least one topic
+  const finalTopics = useMemo(() => {
+    if (topics.length > 0) {
+      return topics
+    }
+    return [getDefaultTopic(defaultAssistant.id)]
+  }, [topics, defaultAssistant.id])
 
   return {
     defaultAssistant: {
       ...defaultAssistant,
-      topics: memoizedTopics
+      topics: finalTopics
     },
     updateDefaultAssistant: (assistant: Assistant) => dispatch(updateDefaultAssistant({ assistant }))
   }
diff --git a/src/renderer/src/hooks/useChat.tsx b/src/renderer/src/hooks/useChat.tsx
index 64ac8f2f35..cb69eac541 100644
--- a/src/renderer/src/hooks/useChat.tsx
+++ b/src/renderer/src/hooks/useChat.tsx
@@ -6,13 +6,14 @@ import { Assistant } from '@renderer/types'
 import { Topic } from '@renderer/types'
 import { useEffect } from 'react'
 
-import { useAssistants } from './useAssistant'
+import { useAssistants, useTopicsForAssistant } from './useAssistant'
 import { useSettings } from './useSettings'
 
 export const useChat = () => {
   const { assistants } = useAssistants()
   const activeAssistant = useAppSelector((state) => state.runtime.chat.activeAssistant) || assistants[0]
-  const activeTopic = useAppSelector((state) => state.runtime.chat.activeTopic) || activeAssistant?.topics[0]!
+  const topics = useTopicsForAssistant(activeAssistant.id)
+  const activeTopic = useAppSelector((state) => state.runtime.chat.activeTopic) || topics[0]
   const { clickAssistantToShowTopic } = useSettings()
   const dispatch = useAppDispatch()
 
@@ -24,12 +25,12 @@ export const useChat = () => {
   }, [activeTopic, dispatch])
 
   useEffect(() => {
-    if (activeAssistant?.topics?.find((topic) => topic.id === activeTopic?.id)) {
+    if (topics.find((topic) => topic.id === activeTopic?.id)) {
       return
     }
-    const firstTopic = activeAssistant.topics[0]
+    const firstTopic = topics[0]
     firstTopic && dispatch(setActiveTopic(firstTopic))
-  }, [activeAssistant, activeTopic?.id, dispatch])
+  }, [activeAssistant, activeTopic?.id, dispatch, topics])
 
   useEffect(() => {
     if (clickAssistantToShowTopic) {
diff --git a/src/renderer/src/hooks/useTopic.ts b/src/renderer/src/hooks/useTopic.ts
index d0d177d763..bd2f0cb7c0 100644
--- a/src/renderer/src/hooks/useTopic.ts
+++ b/src/renderer/src/hooks/useTopic.ts
@@ -2,7 +2,7 @@ import db from '@renderer/databases'
 import i18n from '@renderer/i18n'
 import { deleteMessageFiles } from '@renderer/services/MessagesService'
 import store from '@renderer/store'
-import { updateTopic } from '@renderer/store/assistants'
+import { selectTopicById, topicsActions } from '@renderer/store/topics'
 import { Assistant, Topic } from '@renderer/types'
 import { findMainTextBlocks } from '@renderer/utils/messageUtils/find'
 import { isEmpty } from 'lodash'
@@ -11,18 +11,17 @@ import { getStoreSetting } from './useSettings'
 
 const renamingTopics = new Set<string>()
 
-export function useTopic(assistant: Assistant, topicId?: string) {
-  return assistant?.topics.find((topic) => topic.id === topicId)
+export function useTopic(topicId?: string) {
+  if (!topicId) return undefined
+  return selectTopicById(store.getState(), topicId)
 }
 
-export function getTopic(assistant: Assistant, topicId: string) {
-  return assistant?.topics.find((topic) => topic.id === topicId)
+export function getTopic(topicId: string) {
+  return selectTopicById(store.getState(), topicId)
 }
 
 export async function getTopicById(topicId: string) {
-  const assistants = store.getState().assistants.assistants
-  const topics = assistants.map((assistant) => assistant.topics).flat()
-  const topic = topics.find((topic) => topic.id === topicId)
+  const topic = selectTopicById(store.getState(), topicId)
   const messages = await TopicManager.getTopicMessages(topicId)
   return { ...topic, messages } as Topic
 }
@@ -55,7 +54,7 @@ export const autoRenameTopic = async (assistant: Assistant, topicId: string) =>
         .substring(0, 50)
       if (topicName) {
         const data = { ...topic, name: topicName } as Topic
-        store.dispatch(updateTopic({ assistantId: assistant.id, topic: data }))
+        store.dispatch(topicsActions.updateTopic({ assistantId: assistant.id, topic: data }))
       }
       return
     }
@@ -65,7 +64,7 @@ export const autoRenameTopic = async (assistant: Assistant, topicId: string) =>
       const summaryText = await fetchMessagesSummary({ messages: topic.messages, assistant })
       if (summaryText) {
         const data = { ...topic, name: summaryText }
-        store.dispatch(updateTopic({ assistantId: assistant.id, topic: data }))
+        store.dispatch(topicsActions.updateTopic({ assistantId: assistant.id, topic: data }))
       }
     }
   } finally {
diff --git a/src/renderer/src/i18n/locales/en-us.json b/src/renderer/src/i18n/locales/en-us.json
index 73d55ea3cd..4a246547ad 100644
--- a/src/renderer/src/i18n/locales/en-us.json
+++ b/src/renderer/src/i18n/locales/en-us.json
@@ -980,6 +980,7 @@
       "azure-openai": "Azure OpenAI",
       "baichuan": "Baichuan",
       "baidu-cloud": "Baidu Cloud",
+      "cephalon": "Cephalon",
       "copilot": "GitHub Copilot",
       "dashscope": "Alibaba Cloud",
       "deepseek": "DeepSeek",
@@ -1020,7 +1021,8 @@
       "zhipu": "ZHIPU AI",
       "voyageai": "Voyage AI",
       "qiniu": "Qiniu AI",
-      "tokenflux": "TokenFlux"
+      "tokenflux": "TokenFlux",
+      "302ai": "302.AI"
     },
     "restore": {
       "confirm": "Are you sure you want to restore data?",
diff --git a/src/renderer/src/i18n/locales/ja-jp.json b/src/renderer/src/i18n/locales/ja-jp.json
index 1330363aee..45bae14e71 100644
--- a/src/renderer/src/i18n/locales/ja-jp.json
+++ b/src/renderer/src/i18n/locales/ja-jp.json
@@ -706,7 +706,7 @@
       "error.yuque.no_config": "語雀のAPIアドレスまたはトークンが設定されていません",
       "download.success": "ダウンロードに成功しました",
       "download.failed": "ダウンロードに失敗しました",
-      "error.fetchTopicName": "[to be translated]:Failed to name the topic"
+      "error.fetchTopicName": "トピック名の取得に失敗しました"
     },
     "minapp": {
       "popup": {
@@ -1020,7 +1020,9 @@
       "zhipu": "智譜AI",
       "voyageai": "Voyage AI",
       "qiniu": "七牛云 AI 推理",
-      "tokenflux": "TokenFlux"
+      "tokenflux": "TokenFlux",
+      "302ai": "302.AI",
+      "cephalon": "Cephalon"
     },
     "restore": {
       "confirm": "データを復元しますか？",
@@ -2045,4 +2047,4 @@
       }
     }
   }
-}
\ No newline at end of file
+}
diff --git a/src/renderer/src/i18n/locales/ru-ru.json b/src/renderer/src/i18n/locales/ru-ru.json
index ead1d32056..19caafa5b8 100644
--- a/src/renderer/src/i18n/locales/ru-ru.json
+++ b/src/renderer/src/i18n/locales/ru-ru.json
@@ -706,7 +706,7 @@
       "warn.siyuan.exporting": "Экспортируется в Siyuan, пожалуйста, не отправляйте повторные запросы!",
       "download.success": "Скачано успешно",
       "download.failed": "Скачивание не удалось",
-      "error.fetchTopicName": "[to be translated]:Failed to name the topic"
+      "error.fetchTopicName": "Не удалось назвать топик"
     },
     "minapp": {
       "popup": {
@@ -980,6 +980,7 @@
       "azure-openai": "Azure OpenAI",
       "baichuan": "Baichuan",
       "baidu-cloud": "Baidu Cloud",
+      "cephalon": "Cephalon",
       "copilot": "GitHub Copilot",
       "dashscope": "Alibaba Cloud",
       "deepseek": "DeepSeek",
@@ -1020,7 +1021,8 @@
       "zhipu": "ZHIPU AI",
       "voyageai": "Voyage AI",
       "qiniu": "Qiniu AI",
-      "tokenflux": "TokenFlux"
+      "tokenflux": "TokenFlux",
+      "302ai": "302.AI"
     },
     "restore": {
       "confirm": "Вы уверены, что хотите восстановить данные?",
@@ -2045,4 +2047,4 @@
       }
     }
   }
-}
\ No newline at end of file
+}
diff --git a/src/renderer/src/i18n/locales/zh-cn.json b/src/renderer/src/i18n/locales/zh-cn.json
index 179575a736..64dd191d04 100644
--- a/src/renderer/src/i18n/locales/zh-cn.json
+++ b/src/renderer/src/i18n/locales/zh-cn.json
@@ -980,6 +980,7 @@
       "azure-openai": "Azure OpenAI",
       "baichuan": "百川",
       "baidu-cloud": "百度云千帆",
+      "cephalon": "Cephalon",
       "copilot": "GitHub Copilot",
       "dashscope": "阿里云百炼",
       "deepseek": "深度求索",
@@ -1020,7 +1021,8 @@
       "zhipu": "智谱AI",
       "voyageai": "Voyage AI",
       "qiniu": "七牛云 AI 推理",
-      "tokenflux": "TokenFlux"
+      "tokenflux": "TokenFlux",
+      "302ai": "302.AI"
     },
     "restore": {
       "confirm": "确定要恢复数据吗？",
diff --git a/src/renderer/src/i18n/locales/zh-tw.json b/src/renderer/src/i18n/locales/zh-tw.json
index bca0952797..42cb03ebb4 100644
--- a/src/renderer/src/i18n/locales/zh-tw.json
+++ b/src/renderer/src/i18n/locales/zh-tw.json
@@ -980,6 +980,7 @@
       "azure-openai": "Azure OpenAI",
       "baichuan": "百川",
       "baidu-cloud": "百度雲千帆",
+      "cephalon": "Cephalon",
       "copilot": "GitHub Copilot",
       "dashscope": "阿里雲百鍊",
       "deepseek": "深度求索",
@@ -1020,7 +1021,8 @@
       "zhipu": "智譜 AI",
       "voyageai": "Voyage AI",
       "qiniu": "七牛雲 AI 推理",
-      "tokenflux": "TokenFlux"
+      "tokenflux": "TokenFlux",
+      "302ai": "302.AI"
     },
     "restore": {
       "confirm": "確定要復原資料嗎？",
diff --git a/src/renderer/src/i18n/translate/el-gr.json b/src/renderer/src/i18n/translate/el-gr.json
index 81ff1ab7f0..4362777ee7 100644
--- a/src/renderer/src/i18n/translate/el-gr.json
+++ b/src/renderer/src/i18n/translate/el-gr.json
@@ -840,6 +840,7 @@
       "azure-openai": "Azure OpenAI",
       "baichuan": "Παράκειμαι",
       "baidu-cloud": "Baidu Cloud Qianfan",
+      "cephalon": "Cephalon",
       "copilot": "GitHub Copilot",
       "dashscope": "AliCloud Bailian",
       "deepseek": "Βαθιά Αναζήτηση",
diff --git a/src/renderer/src/i18n/translate/es-es.json b/src/renderer/src/i18n/translate/es-es.json
index 679dc678a6..f6323c7490 100644
--- a/src/renderer/src/i18n/translate/es-es.json
+++ b/src/renderer/src/i18n/translate/es-es.json
@@ -841,6 +841,7 @@
       "azure-openai": "Azure OpenAI",
       "baichuan": "BaiChuan",
       "baidu-cloud": "Baidu Nube Qiánfān",
+      "cephalon": "Cephalon",
       "copilot": "GitHub Copiloto",
       "dashscope": "Álibaba Nube BaiLiàn",
       "deepseek": "Profundo Buscar",
diff --git a/src/renderer/src/i18n/translate/fr-fr.json b/src/renderer/src/i18n/translate/fr-fr.json
index b7db9ff5fb..0289043f5c 100644
--- a/src/renderer/src/i18n/translate/fr-fr.json
+++ b/src/renderer/src/i18n/translate/fr-fr.json
@@ -840,6 +840,7 @@
       "azure-openai": "Azure OpenAI",
       "baichuan": "BaiChuan",
       "baidu-cloud": "Baidu Cloud Qianfan",
+      "cephalon": "Cephalon",
       "copilot": "GitHub Copilote",
       "dashscope": "AliCloud BaiLian",
       "deepseek": "DeepSeek",
diff --git a/src/renderer/src/pages/history/components/TopicsHistory.tsx b/src/renderer/src/pages/history/components/TopicsHistory.tsx
index d95a3f7ae6..13738567f9 100644
--- a/src/renderer/src/pages/history/components/TopicsHistory.tsx
+++ b/src/renderer/src/pages/history/components/TopicsHistory.tsx
@@ -1,8 +1,9 @@
 import { SearchOutlined } from '@ant-design/icons'
 import { VStack } from '@renderer/components/Layout'
-import { useAssistants } from '@renderer/hooks/useAssistant'
 import useScrollPosition from '@renderer/hooks/useScrollPosition'
 import { getTopicById } from '@renderer/hooks/useTopic'
+import { useAppSelector } from '@renderer/store'
+import { selectAllTopics } from '@renderer/store/topics'
 import { Topic } from '@renderer/types'
 import { Button, Divider, Empty } from 'antd'
 import dayjs from 'dayjs'
@@ -17,13 +18,13 @@ type Props = {
 } & React.HTMLAttributes<HTMLDivElement>
 
 const TopicsHistory: React.FC<Props> = ({ keywords, onClick, onSearch, ...props }) => {
-  const { assistants } = useAssistants()
+  const topics = useAppSelector(selectAllTopics)
   const { t } = useTranslation()
   const { handleScroll, containerRef } = useScrollPosition('TopicsHistory')
 
-  const topics = orderBy(assistants.map((assistant) => assistant.topics).flat(), 'createdAt', 'desc')
+  const orderedTopics = orderBy(topics, 'createdAt', 'desc')
 
-  const filteredTopics = topics.filter((topic) => {
+  const filteredTopics = orderedTopics.filter((topic) => {
     return topic.name.toLowerCase().includes(keywords.toLowerCase())
   })
 
diff --git a/src/renderer/src/pages/home/Messages/MessageMenubar.tsx b/src/renderer/src/pages/home/Messages/MessageMenubar.tsx
index b161cdca53..f3382312ad 100644
--- a/src/renderer/src/pages/home/Messages/MessageMenubar.tsx
+++ b/src/renderer/src/pages/home/Messages/MessageMenubar.tsx
@@ -15,6 +15,7 @@ import type { Model } from '@renderer/types'
 import type { Assistant, Topic } from '@renderer/types'
 import type { Message } from '@renderer/types/newMessage'
 import { captureScrollableDivAsBlob, captureScrollableDivAsDataURL } from '@renderer/utils'
+import { copyMessageAsPlainText } from '@renderer/utils/copy'
 import {
   exportMarkdownToJoplin,
   exportMarkdownToSiyuan,
@@ -23,7 +24,6 @@ import {
   exportMessageToNotion,
   messageToMarkdown
 } from '@renderer/utils/export'
-import { copyMessageAsPlainText } from '@renderer/utils/copy'
 // import { withMessageThought } from '@renderer/utils/formats'
 import { removeTrailingDoubleSpaces } from '@renderer/utils/markdown'
 import { findMainTextBlocks, findTranslationBlocks, getMainTextContent } from '@renderer/utils/messageUtils/find'
diff --git a/src/renderer/src/pages/home/Messages/Messages.tsx b/src/renderer/src/pages/home/Messages/Messages.tsx
index 8241742106..20683d2bbf 100644
--- a/src/renderer/src/pages/home/Messages/Messages.tsx
+++ b/src/renderer/src/pages/home/Messages/Messages.tsx
@@ -111,7 +111,7 @@ const Messages: React.FC<MessagesProps> = ({ assistant, topic, setActiveTopic, o
 
       setDisplayMessages([])
 
-      const _topic = getTopic(assistant, topic.id)
+      const _topic = getTopic(topic.id)
       _topic && updateTopic({ ..._topic, name: defaultTopic.name } as Topic)
     },
     [assistant, clearTopicMessages, topic.id, updateTopic]
diff --git a/src/renderer/src/pages/home/Tabs/TopicsTab.tsx b/src/renderer/src/pages/home/Tabs/TopicsTab.tsx
index f58be564ba..1929eba045 100644
--- a/src/renderer/src/pages/home/Tabs/TopicsTab.tsx
+++ b/src/renderer/src/pages/home/Tabs/TopicsTab.tsx
@@ -14,7 +14,7 @@ import ObsidianExportPopup from '@renderer/components/Popups/ObsidianExportPopup
 import PromptPopup from '@renderer/components/Popups/PromptPopup'
 import Scrollbar from '@renderer/components/Scrollbar'
 import { isMac } from '@renderer/config/constant'
-import { useAssistant, useAssistants } from '@renderer/hooks/useAssistant'
+import { useAssistant, useAssistants, useTopicsForAssistant } from '@renderer/hooks/useAssistant'
 import { modelGenerating } from '@renderer/hooks/useRuntime'
 import { useSettings } from '@renderer/hooks/useSettings'
 import { TopicManager } from '@renderer/hooks/useTopic'
@@ -56,6 +56,8 @@ const Topics: FC<Props> = ({ assistant: _assistant, activeTopic, setActiveTopic
   const { t } = useTranslation()
   const { showTopicTime, pinTopicsToTop } = useSettings()
 
+  const topics = useTopicsForAssistant(_assistant.id)
+
   const borderRadius = showTopicTime ? 12 : 'var(--list-item-border-radius)'
 
   const [deletingTopicId, setDeletingTopicId] = useState<string | null>(null)
@@ -104,16 +106,16 @@ const Topics: FC<Props> = ({ assistant: _assistant, activeTopic, setActiveTopic
   const handleConfirmDelete = useCallback(
     async (topic: Topic, e: React.MouseEvent) => {
       e.stopPropagation()
-      if (assistant.topics.length === 1) {
+      if (topics.length === 1) {
         return onClearMessages(topic)
       }
       await modelGenerating()
-      const index = findIndex(assistant.topics, (t) => t.id === topic.id)
-      setActiveTopic(assistant.topics[index + 1 === assistant.topics.length ? index - 1 : index + 1])
+      const index = findIndex(topics, (t) => t.id === topic.id)
+      setActiveTopic(topics[index + 1 === topics.length ? index - 1 : index + 1])
       removeTopic(topic)
       setDeletingTopicId(null)
     },
-    [assistant.topics, onClearMessages, removeTopic, setActiveTopic]
+    [topics, onClearMessages, removeTopic, setActiveTopic]
   )
 
   const onPinTopic = useCallback(
@@ -128,22 +130,22 @@ const Topics: FC<Props> = ({ assistant: _assistant, activeTopic, setActiveTopic
     async (topic: Topic) => {
       await modelGenerating()
       if (topic.id === activeTopic?.id) {
-        const index = findIndex(assistant.topics, (t) => t.id === topic.id)
-        setActiveTopic(assistant.topics[index + 1 === assistant.topics.length ? index - 1 : index + 1])
+        const index = findIndex(topics, (t) => t.id === topic.id)
+        setActiveTopic(topics[index + 1 === topics.length ? index - 1 : index + 1])
       }
       removeTopic(topic)
     },
-    [assistant.topics, removeTopic, setActiveTopic, activeTopic]
+    [topics, removeTopic, setActiveTopic, activeTopic]
   )
 
   const onMoveTopic = useCallback(
     async (topic: Topic, toAssistant: Assistant) => {
       await modelGenerating()
-      const index = findIndex(assistant.topics, (t) => t.id === topic.id)
-      setActiveTopic(assistant.topics[index + 1 === assistant.topics.length ? 0 : index + 1])
+      const index = findIndex(topics, (t) => t.id === topic.id)
+      setActiveTopic(topics[index + 1 === topics.length ? 0 : index + 1])
       moveTopic(topic, toAssistant)
     },
-    [assistant.topics, moveTopic, setActiveTopic]
+    [topics, moveTopic, setActiveTopic]
   )
 
   const onSwitchTopic = useCallback(
@@ -340,7 +342,7 @@ const Topics: FC<Props> = ({ assistant: _assistant, activeTopic, setActiveTopic
       }
     ]
 
-    if (assistants.length > 1 && assistant.topics.length > 1) {
+    if (assistants.length > 1 && topics.length > 1) {
       menus.push({
         label: t('chat.topics.move_to'),
         key: 'move',
@@ -355,7 +357,7 @@ const Topics: FC<Props> = ({ assistant: _assistant, activeTopic, setActiveTopic
       })
     }
 
-    if (assistant.topics.length > 1 && !topic.pinned) {
+    if (topics.length > 1 && !topic.pinned) {
       menus.push({ type: 'divider' })
       menus.push({
         label: t('common.delete'),
@@ -380,6 +382,7 @@ const Topics: FC<Props> = ({ assistant: _assistant, activeTopic, setActiveTopic
     exportMenuOptions.joplin,
     exportMenuOptions.siyuan,
     assistants,
+    topics.length,
     assistant,
     updateTopic,
     activeTopic.id,
@@ -393,14 +396,14 @@ const Topics: FC<Props> = ({ assistant: _assistant, activeTopic, setActiveTopic
   // Sort topics based on pinned status if pinTopicsToTop is enabled
   const sortedTopics = useMemo(() => {
     if (pinTopicsToTop) {
-      return [...assistant.topics].sort((a, b) => {
+      return [...topics].sort((a, b) => {
         if (a.pinned && !b.pinned) return -1
         if (!a.pinned && b.pinned) return 1
         return 0
       })
     }
-    return assistant.topics
-  }, [assistant.topics, pinTopicsToTop])
+    return topics
+  }, [topics, pinTopicsToTop])
 
   return (
     <Dropdown menu={{ items: getTopicMenuItems }} trigger={['contextMenu']}>
diff --git a/src/renderer/src/pages/home/Tabs/components/AssistantItem.tsx b/src/renderer/src/pages/home/Tabs/components/AssistantItem.tsx
index fc1f0a6014..348e68876c 100644
--- a/src/renderer/src/pages/home/Tabs/components/AssistantItem.tsx
+++ b/src/renderer/src/pages/home/Tabs/components/AssistantItem.tsx
@@ -13,7 +13,7 @@ import ModelAvatar from '@renderer/components/Avatar/ModelAvatar'
 import EmojiIcon from '@renderer/components/EmojiIcon'
 import CopyIcon from '@renderer/components/Icons/CopyIcon'
 import PromptPopup from '@renderer/components/Popups/PromptPopup'
-import { useAssistant, useAssistants } from '@renderer/hooks/useAssistant'
+import { useAssistant, useAssistants, useTopicsForAssistant } from '@renderer/hooks/useAssistant'
 import { useSettings } from '@renderer/hooks/useSettings'
 import { useTags } from '@renderer/hooks/useTags'
 import AssistantSettingsPopup from '@renderer/pages/settings/AssistantSettings'
@@ -64,6 +64,8 @@ const AssistantItem: FC<AssistantItemProps> = ({
   const defaultModel = getDefaultModel()
   const { assistants, updateAssistants } = useAssistants()
 
+  const topics = useTopicsForAssistant(assistant.id)
+
   const [isPending, setIsPending] = useState(false)
   const [isMenuOpen, setIsMenuOpen] = useState(false)
 
@@ -73,9 +75,9 @@ const AssistantItem: FC<AssistantItemProps> = ({
       return
     }
 
-    const hasPending = assistant.topics.some((topic) => hasTopicPendingRequests(topic.id))
+    const hasPending = topics.some((topic) => hasTopicPendingRequests(topic.id))
     setIsPending(hasPending)
-  }, [isActive, assistant.topics])
+  }, [isActive, topics])
 
   const sortByPinyinAsc = useCallback(() => {
     updateAssistants(sortAssistantsByPinyin(assistants, true))
diff --git a/src/renderer/src/services/MessagesService.ts b/src/renderer/src/services/MessagesService.ts
index 178089b25b..ebb8f2df82 100644
--- a/src/renderer/src/services/MessagesService.ts
+++ b/src/renderer/src/services/MessagesService.ts
@@ -6,6 +6,7 @@ import { fetchMessagesSummary } from '@renderer/services/ApiService'
 import store from '@renderer/store'
 import { messageBlocksSelectors, removeManyBlocks } from '@renderer/store/messageBlock'
 import { selectMessagesForTopic } from '@renderer/store/newMessage'
+import { selectTopicsForAssistant } from '@renderer/store/topics'
 import type { Assistant, FileType, MCPServer, Model, Topic, Usage } from '@renderer/types'
 import { FileTypes } from '@renderer/types'
 import type { Message, MessageBlock } from '@renderer/types/newMessage'
@@ -265,7 +266,14 @@ export function checkRateLimit(assistant: Assistant): boolean {
     return false
   }
 
-  const topicId = assistant.topics[0].id
+  const topics = selectTopicsForAssistant(store.getState(), assistant.id)
+  const firstTopic = topics[0]
+
+  if (!firstTopic) {
+    return false
+  }
+
+  const topicId = firstTopic.id
   const messages = selectMessagesForTopic(store.getState(), topicId)
 
   if (!messages || messages.length <= 1) {
diff --git a/src/renderer/src/store/assistants.ts b/src/renderer/src/store/assistants.ts
index 14213006d3..855008b4cd 100644
--- a/src/renderer/src/store/assistants.ts
+++ b/src/renderer/src/store/assistants.ts
@@ -1,9 +1,7 @@
 import { createSlice, PayloadAction } from '@reduxjs/toolkit'
 import { DEFAULT_CONTEXTCOUNT, DEFAULT_TEMPERATURE } from '@renderer/config/constant'
-import { TopicManager } from '@renderer/hooks/useTopic'
-import { getDefaultAssistant, getDefaultTopic } from '@renderer/services/AssistantService'
-import { Assistant, AssistantSettings, Model, Topic } from '@renderer/types'
-import { isEmpty, uniqBy } from 'lodash'
+import { getDefaultAssistant } from '@renderer/services/AssistantService'
+import { Assistant, AssistantSettings, Model } from '@renderer/types'
 
 export interface AssistantsState {
   defaultAssistant: Assistant
@@ -11,9 +9,14 @@ export interface AssistantsState {
   tagsOrder: string[]
 }
 
+// 之前的两个实例会导致两个助手不一致的问题
+// FIXME: 更彻底的办法在这次重构就直接把二者合并了
+// Create a single default assistant instance to ensure consistency
+const defaultAssistant = getDefaultAssistant()
+
 const initialState: AssistantsState = {
-  defaultAssistant: getDefaultAssistant(),
-  assistants: [getDefaultAssistant()],
+  defaultAssistant: defaultAssistant,
+  assistants: [defaultAssistant], // Share the same reference
   tagsOrder: []
 }
 
@@ -22,10 +25,23 @@ const assistantsSlice = createSlice({
   initialState,
   reducers: {
     updateDefaultAssistant: (state, action: PayloadAction<{ assistant: Assistant }>) => {
-      state.defaultAssistant = action.payload.assistant
+      const assistant = action.payload.assistant
+      state.defaultAssistant = assistant
+
+      // Also update the corresponding assistant in the array
+      const index = state.assistants.findIndex((a) => a.id === assistant.id)
+      if (index !== -1) {
+        state.assistants[index] = assistant
+      }
     },
     updateAssistants: (state, action: PayloadAction<Assistant[]>) => {
       state.assistants = action.payload
+
+      // Update defaultAssistant if it exists in the new array
+      const defaultInArray = action.payload.find((a) => a.id === state.defaultAssistant.id)
+      if (defaultInArray) {
+        state.defaultAssistant = defaultInArray
+      }
     },
     addAssistant: (state, action: PayloadAction<Assistant>) => {
       state.assistants.push(action.payload)
@@ -34,7 +50,13 @@ const assistantsSlice = createSlice({
       state.assistants = state.assistants.filter((c) => c.id !== action.payload.id)
     },
     updateAssistant: (state, action: PayloadAction<Assistant>) => {
-      state.assistants = state.assistants.map((c) => (c.id === action.payload.id ? action.payload : c))
+      const assistant = action.payload
+      state.assistants = state.assistants.map((c) => (c.id === assistant.id ? assistant : c))
+
+      // Also update defaultAssistant if it's the same assistant
+      if (state.defaultAssistant.id === assistant.id) {
+        state.defaultAssistant = assistant
+      }
     },
     updateAssistantSettings: (
       state,
@@ -58,78 +80,25 @@ const assistantsSlice = createSlice({
         }
       }
     },
-    addTopic: (state, action: PayloadAction<{ assistantId: string; topic: Topic }>) => {
-      const topic = action.payload.topic
-      topic.createdAt = topic.createdAt || new Date().toISOString()
-      topic.updatedAt = topic.updatedAt || new Date().toISOString()
-      state.assistants = state.assistants.map((assistant) =>
-        assistant.id === action.payload.assistantId
-          ? {
-              ...assistant,
-              topics: uniqBy([topic, ...assistant.topics], 'id')
-            }
-          : assistant
-      )
-    },
-    removeTopic: (state, action: PayloadAction<{ assistantId: string; topic: Topic }>) => {
-      state.assistants = state.assistants.map((assistant) =>
-        assistant.id === action.payload.assistantId
-          ? {
-              ...assistant,
-              topics: assistant.topics.filter(({ id }) => id !== action.payload.topic.id)
-            }
-          : assistant
-      )
-    },
-    updateTopic: (state, action: PayloadAction<{ assistantId: string; topic: Topic }>) => {
-      const newTopic = action.payload.topic
-      newTopic.updatedAt = new Date().toISOString()
-      state.assistants = state.assistants.map((assistant) =>
-        assistant.id === action.payload.assistantId
-          ? {
-              ...assistant,
-              topics: assistant.topics.map((topic) => {
-                const _topic = topic.id === newTopic.id ? newTopic : topic
-                _topic.messages = []
-                return _topic
-              })
-            }
-          : assistant
-      )
-    },
-    updateTopics: (state, action: PayloadAction<{ assistantId: string; topics: Topic[] }>) => {
-      state.assistants = state.assistants.map((assistant) =>
-        assistant.id === action.payload.assistantId
-          ? {
-              ...assistant,
-              topics: action.payload.topics.map((topic) =>
-                isEmpty(topic.messages) ? topic : { ...topic, messages: [] }
-              )
-            }
-          : assistant
-      )
-    },
-    removeAllTopics: (state, action: PayloadAction<{ assistantId: string }>) => {
-      state.assistants = state.assistants.map((assistant) => {
-        if (assistant.id === action.payload.assistantId) {
-          assistant.topics.forEach((topic) => TopicManager.removeTopic(topic.id))
-          return {
-            ...assistant,
-            topics: [getDefaultTopic(assistant.id)]
-          }
-        }
-        return assistant
-      })
-    },
+
     setModel: (state, action: PayloadAction<{ assistantId: string; model: Model }>) => {
+      const { assistantId, model } = action.payload
       state.assistants = state.assistants.map((assistant) =>
-        assistant.id === action.payload.assistantId
+        assistant.id === assistantId
           ? {
               ...assistant,
-              model: action.payload.model
+              model: model
             }
           : assistant
       )
+
+      // Also update defaultAssistant if it's the same assistant
+      if (state.defaultAssistant.id === assistantId) {
+        state.defaultAssistant = {
+          ...state.defaultAssistant,
+          model: model
+        }
+      }
     },
     setTagsOrder: (state, action: PayloadAction<string[]>) => {
       state.tagsOrder = action.payload
@@ -143,11 +112,6 @@ export const {
   addAssistant,
   removeAssistant,
   updateAssistant,
-  addTopic,
-  removeTopic,
-  updateTopic,
-  updateTopics,
-  removeAllTopics,
   setModel,
   setTagsOrder,
   updateAssistantSettings
diff --git a/src/renderer/src/store/index.ts b/src/renderer/src/store/index.ts
index d0ded856a0..f5c0a444ee 100644
--- a/src/renderer/src/store/index.ts
+++ b/src/renderer/src/store/index.ts
@@ -22,6 +22,7 @@ import runtime from './runtime'
 import selectionStore from './selectionStore'
 import settings from './settings'
 import shortcuts from './shortcuts'
+import topics from './topics'
 import websearch from './websearch'
 
 const rootReducer = combineReducers({
@@ -40,6 +41,7 @@ const rootReducer = combineReducers({
   mcp,
   copilot,
   selectionStore,
+  topics,
   // messages: messagesReducer,
   messages: newMessagesReducer,
   messageBlocks: messageBlocksReducer,
@@ -50,7 +52,7 @@ const persistedReducer = persistReducer(
   {
     key: 'cherry-studio',
     storage,
-    version: 111,
+    version: 113,
     blacklist: ['runtime', 'messages', 'messageBlocks'],
     migrate
   },
@@ -69,7 +71,7 @@ const persistedReducer = persistReducer(
  * Call storeSyncService.subscribe() in the window's entryPoint.tsx
  */
 storeSyncService.setOptions({
-  syncList: ['assistants/', 'settings/', 'llm/', 'selectionStore/']
+  syncList: ['assistants/', 'settings/', 'llm/', 'selectionStore/', 'topics/']
 })
 
 const store = configureStore({
diff --git a/src/renderer/src/store/llm.ts b/src/renderer/src/store/llm.ts
index d5c8fd566d..1ca1dad6ae 100644
--- a/src/renderer/src/store/llm.ts
+++ b/src/renderer/src/store/llm.ts
@@ -127,12 +127,22 @@ export const INITIAL_PROVIDERS: Provider[] = [
     enabled: false
   },
   {
-    id: 'o3',
-    name: 'O3',
+    id: '302ai',
+    name: '302.AI',
     type: 'openai',
     apiKey: '',
-    apiHost: 'https://api.o3.fan',
-    models: SYSTEM_MODELS.o3,
+    apiHost: 'https://api.302.ai',
+    models: SYSTEM_MODELS['302ai'],
+    isSystem: true,
+    enabled: false
+  },
+  {
+    id: 'cephalon',
+    name: 'Cephalon',
+    type: 'openai',
+    apiKey: '',
+    apiHost: 'https://cephalon.cloud/user-center/v1/model',
+    models: SYSTEM_MODELS.cephalon,
     isSystem: true,
     enabled: false
   },
diff --git a/src/renderer/src/store/migrate.ts b/src/renderer/src/store/migrate.ts
index 3f25e375d8..21dc198c35 100644
--- a/src/renderer/src/store/migrate.ts
+++ b/src/renderer/src/store/migrate.ts
@@ -5,7 +5,8 @@ import { SYSTEM_MODELS } from '@renderer/config/models'
 import { TRANSLATE_PROMPT } from '@renderer/config/prompts'
 import db from '@renderer/databases'
 import i18n from '@renderer/i18n'
-import { Assistant, WebSearchProvider } from '@renderer/types'
+import { getDefaultTopic } from '@renderer/services/AssistantService'
+import { Assistant, Topic, WebSearchProvider } from '@renderer/types'
 import { getDefaultGroupName, getLeadingEmoji, runAsyncFunction, uuid } from '@renderer/utils'
 import { isEmpty } from 'lodash'
 import { createMigrate } from 'redux-persist'
@@ -1555,6 +1556,132 @@ const migrateConfig = {
     } catch (error) {
       return state
     }
+  },
+  '112': (state: RootState) => {
+    try {
+      addProvider(state, 'cephalon')
+      addProvider(state, '302ai')
+      state.llm.providers = moveProvider(state.llm.providers, 'cephalon', 13)
+      state.llm.providers = moveProvider(state.llm.providers, '302ai', 14)
+      return state
+    } catch (error) {
+      return state
+    }
+  },
+  '113': (state: RootState) => {
+    try {
+      // Step 1: Merge defaultAssistant and assistants[0] topics to ensure consistency
+      // This fixes any inconsistencies from backup restores or previous versions
+
+      if (state.assistants?.defaultAssistant && state.assistants?.assistants?.length > 0) {
+        const defaultAssistantId = state.assistants.defaultAssistant.id
+        const defaultAssistantInArray = state.assistants.assistants.find((a) => a.id === defaultAssistantId)
+
+        if (defaultAssistantInArray) {
+          // Merge topics from both defaultAssistant and assistants[0]
+          const defaultTopics = state.assistants.defaultAssistant.topics || []
+          const arrayTopics = defaultAssistantInArray.topics || []
+
+          // Create a map to avoid duplicates (by topic id)
+          const topicsMap = new Map<string, Topic>()
+
+          // Add topics from both sources
+          const allTopics = [...defaultTopics, ...arrayTopics]
+          allTopics.forEach((topic) => {
+            if (topic && topic.id) {
+              // Keep the one with more recent updatedAt, or prefer the one from assistants array
+              const existing = topicsMap.get(topic.id)
+              if (
+                !existing ||
+                (topic.updatedAt && existing.updatedAt && topic.updatedAt > existing.updatedAt) ||
+                arrayTopics.includes(topic)
+              ) {
+                topicsMap.set(topic.id, topic)
+              }
+            }
+          })
+
+          const mergedTopics = Array.from(topicsMap.values())
+
+          // Update both defaultAssistant and the assistant in array
+          state.assistants.defaultAssistant.topics = mergedTopics
+          defaultAssistantInArray.topics = mergedTopics
+        } else {
+          // defaultAssistant not found in array, add it
+          state.assistants.assistants.unshift(state.assistants.defaultAssistant)
+        }
+      }
+
+      // Step 2: Migrate from nested topic structure to flattened topic structure
+      // This should run after v112 which ensures defaultAssistant and assistants[0] consistency
+
+      // Initialize the new topics slice if it doesn't exist
+      if (!state.topics) {
+        state.topics = {
+          ids: [],
+          entities: {},
+          topicIdsByAssistant: {}
+        }
+      }
+
+      // Type for legacy assistant with topics
+      type LegacyAssistant = Assistant
+
+      // Extract all topics from assistants and flatten them
+      const allTopics: Topic[] = []
+      const topicIdsByAssistant: Record<string, string[]> = {}
+
+      // Process regular assistants
+      if (state.assistants?.assistants) {
+        state.assistants.assistants.forEach((assistant) => {
+          const legacyAssistant = assistant as LegacyAssistant
+          if (legacyAssistant.topics && Array.isArray(legacyAssistant.topics) && legacyAssistant.topics.length > 0) {
+            allTopics.push(...legacyAssistant.topics)
+            topicIdsByAssistant[assistant.id] = legacyAssistant.topics.map((t: Topic) => t.id)
+
+            // Clear deprecated field
+            legacyAssistant.topics = []
+          } else {
+            // Create default topic for assistant with no topics
+            const defaultTopic = getDefaultTopic(assistant.id)
+            allTopics.push(defaultTopic)
+            topicIdsByAssistant[assistant.id] = [defaultTopic.id]
+
+            // Set deprecated field
+            legacyAssistant.topics = []
+          }
+        })
+      }
+
+      // Process default assistant - should already be consistent after v112
+      if (state.assistants?.defaultAssistant) {
+        const legacyDefaultAssistant = state.assistants.defaultAssistant as LegacyAssistant
+
+        // Since v112 already ensured consistency, just clear the deprecated field
+        legacyDefaultAssistant.topics = []
+      }
+
+      // Populate the new topics slice
+      const topicEntities: Record<string, Topic> = {}
+      const topicIds: string[] = []
+
+      allTopics.forEach((topic) => {
+        topicEntities[topic.id] = topic
+        topicIds.push(topic.id)
+      })
+
+      // Update topics slice
+      state.topics = {
+        ids: topicIds,
+        entities: topicEntities,
+        topicIdsByAssistant
+      }
+
+      return state
+    } catch (error) {
+      console.error('Migration 112 failed:', error)
+      return state
+    }
   }
 }
 
diff --git a/src/renderer/src/store/topics.ts b/src/renderer/src/store/topics.ts
new file mode 100644
index 0000000000..3a623315e0
--- /dev/null
+++ b/src/renderer/src/store/topics.ts
@@ -0,0 +1,185 @@
+import { createEntityAdapter, createSlice, EntityState, PayloadAction } from '@reduxjs/toolkit'
+// --- Selectors ---
+import { createSelector } from '@reduxjs/toolkit'
+import { TopicManager } from '@renderer/hooks/useTopic'
+import { getDefaultTopic } from '@renderer/services/AssistantService'
+import { Topic } from '@renderer/types'
+
+import type { RootState } from './index'
+
+// 1. Create the Adapter
+const topicsAdapter = createEntityAdapter<Topic>()
+
+// 2. Define the State Interface
+export interface TopicsState extends EntityState<Topic, string> {
+  topicIdsByAssistant: Record<string, string[]> // Map: assistantId -> ordered topic IDs
+}
+
+// Create default topic for default assistant
+const defaultTopic = getDefaultTopic('default')
+
+// 3. Define the Initial State with default topic
+const initialState: TopicsState = topicsAdapter.getInitialState(
+  {
+    topicIdsByAssistant: {
+      default: [defaultTopic.id] // Default assistant has default topic
+    }
+  },
+  {
+    [defaultTopic.id]: defaultTopic // Add default topic to entities
+  }
+)
+
+// Payload types
+export interface TopicsReceivedPayload {
+  assistantId: string
+  topics: Topic[]
+}
+
+export interface AddTopicPayload {
+  assistantId: string
+  topic: Topic
+}
+
+export interface RemoveTopicPayload {
+  assistantId: string
+  topicId: string
+}
+
+export interface UpdateTopicPayload {
+  assistantId: string
+  topic: Topic
+}
+
+export interface MoveTopicPayload {
+  fromAssistantId: string
+  toAssistantId: string
+  topicId: string
+}
+
+// 4. Create the Slice
+const topicsSlice = createSlice({
+  name: 'topics',
+  initialState,
+  reducers: {
+    topicsReceived(state, action: PayloadAction<TopicsReceivedPayload>) {
+      const { assistantId, topics } = action.payload
+      topicsAdapter.upsertMany(state, topics)
+      state.topicIdsByAssistant[assistantId] = topics.map((t) => t.id)
+    },
+    addTopic(state, action: PayloadAction<AddTopicPayload>) {
+      const { assistantId, topic } = action.payload
+      const topicWithTimestamp = {
+        ...topic,
+        createdAt: topic.createdAt || new Date().toISOString(),
+        updatedAt: topic.updatedAt || new Date().toISOString()
+      }
+
+      topicsAdapter.addOne(state, topicWithTimestamp)
+
+      if (!state.topicIdsByAssistant[assistantId]) {
+        state.topicIdsByAssistant[assistantId] = []
+      }
+      // Add to the beginning to match original behavior
+      state.topicIdsByAssistant[assistantId].unshift(topic.id)
+    },
+    removeTopic(state, action: PayloadAction<RemoveTopicPayload>) {
+      const { assistantId, topicId } = action.payload
+
+      topicsAdapter.removeOne(state, topicId)
+
+      const currentTopicIds = state.topicIdsByAssistant[assistantId]
+      if (currentTopicIds) {
+        state.topicIdsByAssistant[assistantId] = currentTopicIds.filter((id) => id !== topicId)
+      }
+
+      // Remove topic from database
+      TopicManager.removeTopic(topicId)
+    },
+    updateTopic(state, action: PayloadAction<UpdateTopicPayload>) {
+      const { topic } = action.payload
+      const updatedTopic = {
+        ...topic,
+        updatedAt: new Date().toISOString()
+      }
+
+      topicsAdapter.updateOne(state, {
+        id: topic.id,
+        changes: { ...updatedTopic, messages: [] } // Clear messages in redux to match original behavior
+      })
+    },
+    updateTopics(state, action: PayloadAction<TopicsReceivedPayload>) {
+      const { assistantId, topics } = action.payload
+
+      const topicsWithoutMessages = topics.map((topic) => ({
+        ...topic,
+        messages: [] // Clear messages in redux
+      }))
+
+      topicsAdapter.upsertMany(state, topicsWithoutMessages)
+      state.topicIdsByAssistant[assistantId] = topics.map((t) => t.id)
+    },
+    removeAllTopics(state, action: PayloadAction<{ assistantId: string }>) {
+      const { assistantId } = action.payload
+      const topicIds = state.topicIdsByAssistant[assistantId] || []
+
+      // Remove topics from database
+      topicIds.forEach((topicId) => TopicManager.removeTopic(topicId))
+
+      // Remove topics from redux
+      topicsAdapter.removeMany(state, topicIds)
+
+      // Create default topic
+      const defaultTopic = getDefaultTopic(assistantId)
+      topicsAdapter.addOne(state, defaultTopic)
+      state.topicIdsByAssistant[assistantId] = [defaultTopic.id]
+    },
+    moveTopic(state, action: PayloadAction<MoveTopicPayload>) {
+      const { fromAssistantId, toAssistantId, topicId } = action.payload
+
+      // Update topic's assistantId
+      topicsAdapter.updateOne(state, {
+        id: topicId,
+        changes: { assistantId: toAssistantId }
+      })
+
+      // Remove from source assistant's topic list
+      const fromTopicIds = state.topicIdsByAssistant[fromAssistantId]
+      if (fromTopicIds) {
+        state.topicIdsByAssistant[fromAssistantId] = fromTopicIds.filter((id) => id !== topicId)
+      }
+
+      // Add to target assistant's topic list
+      if (!state.topicIdsByAssistant[toAssistantId]) {
+        state.topicIdsByAssistant[toAssistantId] = []
+      }
+      state.topicIdsByAssistant[toAssistantId].unshift(topicId)
+    }
+  }
+})
+
+// 5. Export Actions and Reducer
+export const topicsActions = topicsSlice.actions
+export default topicsSlice.reducer
+
+// Base selector for the topics slice state
+export const selectTopicsState = (state: RootState) => state.topics
+
+// Selectors generated by createEntityAdapter
+export const {
+  selectAll: selectAllTopics,
+  selectById: selectTopicById,
+  selectIds: selectAllTopicIds,
+  selectEntities: selectTopicEntities
+} = topicsAdapter.getSelectors(selectTopicsState)
+
+// Custom Selector: Select topics for a specific assistant in order
+export const selectTopicsForAssistant = createSelector(
+  [selectTopicEntities, (state: RootState, assistantId: string) => state.topics.topicIdsByAssistant[assistantId]],
+  (topicEntities, assistantTopicIds) => {
+    if (!assistantTopicIds) {
+      return []
+    }
+    return assistantTopicIds.map((id) => topicEntities[id]).filter((t): t is Topic => !!t)
+  }
+)
diff --git a/src/renderer/src/types/index.ts b/src/renderer/src/types/index.ts
index 6c7ef0576f..fe5af00aa4 100644
--- a/src/renderer/src/types/index.ts
+++ b/src/renderer/src/types/index.ts
@@ -10,6 +10,7 @@ export type Assistant = {
   name: string
   prompt: string
   knowledge_bases?: KnowledgeBase[]
+  /** @deprecated 话题现在通过独立的 topics slice 管理，请使用 selectTopicsForAssistant selector */
   topics: Topic[]
   type: string
   emoji?: string
@@ -69,6 +70,9 @@ export type Agent = Omit<Assistant, 'model'> & {
   group?: string[]
 }
 
+/**
+ * @deprecated 旧版消息类型，已废弃
+ */
 export type LegacyMessage = {
   id: string
   assistantId: string
diff --git a/src/renderer/src/windows/mini/chat/components/Messages.tsx b/src/renderer/src/windows/mini/chat/components/Messages.tsx
index 932446312f..92878e9d06 100644
--- a/src/renderer/src/windows/mini/chat/components/Messages.tsx
+++ b/src/renderer/src/windows/mini/chat/components/Messages.tsx
@@ -1,9 +1,10 @@
 import Scrollbar from '@renderer/components/Scrollbar'
+import { useTopicsForAssistant } from '@renderer/hooks/useAssistant'
 import { useTopicMessages } from '@renderer/hooks/useMessageOperations'
 import { Assistant } from '@renderer/types'
 import { getMainTextContent } from '@renderer/utils/messageUtils/find'
 import { last } from 'lodash'
-import { FC, useRef } from 'react'
+import { FC, useMemo, useRef } from 'react'
 import { useHotkeys } from 'react-hotkeys-hook'
 import { useTranslation } from 'react-i18next'
 import styled from 'styled-components'
@@ -21,7 +22,10 @@ interface ContainerProps {
 
 const Messages: FC<Props> = ({ assistant, route }) => {
   // const [messages, setMessages] = useState<Message[]>([])
-  const messages = useTopicMessages(assistant.topics[0].id)
+  const topics = useTopicsForAssistant(assistant.id)
+  const firstTopic = useMemo(() => topics[0], [topics])
+
+  const messages = useTopicMessages(firstTopic?.id || '')
   const containerRef = useRef<HTMLDivElement>(null)
   const messagesRef = useRef(messages)
 
diff --git a/src/renderer/src/windows/mini/home/HomeWindow.tsx b/src/renderer/src/windows/mini/home/HomeWindow.tsx
index f5b39fc381..4b9d345e61 100644
--- a/src/renderer/src/windows/mini/home/HomeWindow.tsx
+++ b/src/renderer/src/windows/mini/home/HomeWindow.tsx
@@ -1,6 +1,6 @@
 import { isMac } from '@renderer/config/constant'
 import { useTheme } from '@renderer/context/ThemeProvider'
-import { useDefaultAssistant, useDefaultModel } from '@renderer/hooks/useAssistant'
+import { useDefaultAssistant, useDefaultModel, useTopicsForAssistant } from '@renderer/hooks/useAssistant'
 import { useSettings } from '@renderer/hooks/useSettings'
 import i18n from '@renderer/i18n'
 import { fetchChatCompletion } from '@renderer/services/ApiService'
@@ -20,7 +20,7 @@ import { IpcChannel } from '@shared/IpcChannel'
 import { Divider } from 'antd'
 import dayjs from 'dayjs'
 import { isEmpty } from 'lodash'
-import React, { FC, useCallback, useEffect, useRef, useState } from 'react'
+import React, { FC, useCallback, useEffect, useMemo, useRef, useState } from 'react'
 import { useHotkeys } from 'react-hotkeys-hook'
 import { useTranslation } from 'react-i18next'
 import styled from 'styled-components'
@@ -41,7 +41,10 @@ const HomeWindow: FC = () => {
   const [lastClipboardText, setLastClipboardText] = useState<string | null>(null)
   const textChange = useState(() => {})[1]
   const { defaultAssistant } = useDefaultAssistant()
-  const topic = defaultAssistant.topics[0]
+
+  const topics = useTopicsForAssistant(defaultAssistant.id)
+  const topic = useMemo(() => topics[0], [topics])
+
   const { defaultModel, quickAssistantModel } = useDefaultModel()
   // 如果 quickAssistantModel 未設定，則使用 defaultModel
   const model = quickAssistantModel || defaultModel
@@ -182,7 +185,7 @@ const HomeWindow: FC = () => {
       let blockId: string | null = null
       let blockContent: string = ''
 
-      const assistantMessage = getAssistantMessage({ assistant, topic: assistant.topics[0] })
+      const assistantMessage = getAssistantMessage({ assistant, topic })
       store.dispatch(newMessagesActions.addMessage({ topicId, message: assistantMessage }))
 
       fetchChatCompletion({