diff --git a/src/assets/locale/en/settings.json b/src/assets/locale/en/settings.json
index fb798d2..ed76ddf 100644
--- a/src/assets/locale/en/settings.json
+++ b/src/assets/locale/en/settings.json
@@ -23,6 +23,9 @@
             },
             "hideCurrentChatModelSettings": {
                 "label": "Hide the current Chat Model Settings"
+            },
+            "restoreLastChatModel": {
+                "label": "Restore last used model for previous chats"
             }
         },
         "webSearch": {
diff --git a/src/components/Option/Settings/general-settings.tsx b/src/components/Option/Settings/general-settings.tsx
index 1b1e7cc..367f283 100644
--- a/src/components/Option/Settings/general-settings.tsx
+++ b/src/components/Option/Settings/general-settings.tsx
@@ -24,6 +24,11 @@ export const GeneralSettings = () => {
     false
   )
 
+  const [restoreLastChatModel, setRestoreLastChatModel] = useStorage(
+    "restoreLastChatModel",
+    false
+  )
+
   const [hideCurrentChatModelSettings, setHideCurrentChatModelSettings] =
     useStorage("hideCurrentChatModelSettings", false)
 
@@ -107,6 +112,18 @@ export const GeneralSettings = () => {
           onChange={(checked) => setHideCurrentChatModelSettings(checked)}
         />
       </div>
+      <div className="flex flex-row justify-between">
+        <div className="inline-flex items-center gap-2">
+          <span className="text-gray-700   dark:text-neutral-50">
+            {t("generalSettings.settings.restoreLastChatModel.label")}
+          </span>
+        </div>
+
+        <Switch
+          checked={restoreLastChatModel}
+          onChange={(checked) => setRestoreLastChatModel(checked)}
+        />
+      </div>
       <div className="flex flex-row justify-between">
         <span className="text-gray-700 dark:text-neutral-50 ">
           {t("generalSettings.settings.darkMode.label")}
diff --git a/src/components/Option/Sidebar.tsx b/src/components/Option/Sidebar.tsx
index e18f567..9535360 100644
--- a/src/components/Option/Sidebar.tsx
+++ b/src/components/Option/Sidebar.tsx
@@ -11,14 +11,24 @@ import { useMessageOption } from "~/hooks/useMessageOption"
 import { PencilIcon, Trash2 } from "lucide-react"
 import { useNavigate } from "react-router-dom"
 import { useTranslation } from "react-i18next"
+import {
+  getLastUsedChatModel,
+  lastUsedChatModelEnabled
+} from "@/services/model-settings"
 
 type Props = {
   onClose: () => void
 }
 
 export const Sidebar = ({ onClose }: Props) => {
-  const { setMessages, setHistory, setHistoryId, historyId, clearChat } =
-    useMessageOption()
+  const {
+    setMessages,
+    setHistory,
+    setHistoryId,
+    historyId,
+    clearChat,
+    setSelectedModel
+  } = useMessageOption()
   const { t } = useTranslation(["option", "common"])
   const client = useQueryClient()
   const navigate = useNavigate()
@@ -88,6 +98,13 @@ export const Sidebar = ({ onClose }: Props) => {
                   setHistoryId(chat.id)
                   setHistory(formatToChatHistory(history))
                   setMessages(formatToMessage(history))
+                  const isLastUsedChatModel = await lastUsedChatModelEnabled()
+                  if (isLastUsedChatModel) {
+                    const currentChatModel = await getLastUsedChatModel(chat.id)
+                    if (currentChatModel) {
+                      setSelectedModel(currentChatModel)
+                    }
+                  }
                   navigate("/")
                   onClose()
                 }}>
diff --git a/src/hooks/chat-helper/index.ts b/src/hooks/chat-helper/index.ts
index 73f8494..f7b690f 100644
--- a/src/hooks/chat-helper/index.ts
+++ b/src/hooks/chat-helper/index.ts
@@ -1,4 +1,5 @@
 import { saveHistory, saveMessage } from "@/db"
+import { setLastUsedChatModel } from "@/services/model-settings"
 import { ChatHistory } from "@/store/option"
 
 export const saveMessageOnError = async ({
@@ -23,7 +24,7 @@ export const saveMessageOnError = async ({
   historyId: string | null
   selectedModel: string
   setHistoryId: (historyId: string) => void
-  isRegenerating: boolean,
+  isRegenerating: boolean
   message_source?: "copilot" | "web-ui"
 }) => {
   if (
@@ -66,6 +67,7 @@ export const saveMessageOnError = async ({
         [],
         2
       )
+      await setLastUsedChatModel(historyId, selectedModel)
     } else {
       const newHistoryId = await saveHistory(userMessage, false, message_source)
       if (!isRegenerating) {
@@ -89,6 +91,7 @@ export const saveMessageOnError = async ({
         2
       )
       setHistoryId(newHistoryId.id)
+      await setLastUsedChatModel(newHistoryId.id, selectedModel)
     }
 
     return true
@@ -115,7 +118,7 @@ export const saveMessageOnSuccess = async ({
   message: string
   image: string
   fullText: string
-  source: any[],
+  source: any[]
   message_source?: "copilot" | "web-ui"
 }) => {
   if (historyId) {
@@ -139,6 +142,7 @@ export const saveMessageOnSuccess = async ({
       source,
       2
     )
+    await setLastUsedChatModel(historyId, selectedModel!)
   } else {
     const newHistoryId = await saveHistory(message, false, message_source)
     await saveMessage(
@@ -160,5 +164,6 @@ export const saveMessageOnSuccess = async ({
       2
     )
     setHistoryId(newHistoryId.id)
+    await setLastUsedChatModel(newHistoryId.id, selectedModel!)
   }
 }
diff --git a/src/services/model-settings.ts b/src/services/model-settings.ts
index 278576d..501bf59 100644
--- a/src/services/model-settings.ts
+++ b/src/services/model-settings.ts
@@ -2,100 +2,127 @@ import { Storage } from "@plasmohq/storage"
 const storage = new Storage()
 
 type ModelSettings = {
-    f16KV?: boolean
-    frequencyPenalty?: number
-    keepAlive?: string
-    logitsAll?: boolean
-    mirostat?: number
-    mirostatEta?: number
-    mirostatTau?: number
-    numBatch?: number
-    numCtx?: number
-    numGpu?: number
-    numGqa?: number
-    numKeep?: number
-    numPredict?: number
-    numThread?: number
-    penalizeNewline?: boolean
-    presencePenalty?: number
-    repeatLastN?: number
-    repeatPenalty?: number
-    ropeFrequencyBase?: number
-    ropeFrequencyScale?: number
-    temperature?: number
-    tfsZ?: number
-    topK?: number
-    topP?: number
-    typicalP?: number
-    useMLock?: boolean
-    useMMap?: boolean
-    vocabOnly?: boolean
+  f16KV?: boolean
+  frequencyPenalty?: number
+  keepAlive?: string
+  logitsAll?: boolean
+  mirostat?: number
+  mirostatEta?: number
+  mirostatTau?: number
+  numBatch?: number
+  numCtx?: number
+  numGpu?: number
+  numGqa?: number
+  numKeep?: number
+  numPredict?: number
+  numThread?: number
+  penalizeNewline?: boolean
+  presencePenalty?: number
+  repeatLastN?: number
+  repeatPenalty?: number
+  ropeFrequencyBase?: number
+  ropeFrequencyScale?: number
+  temperature?: number
+  tfsZ?: number
+  topK?: number
+  topP?: number
+  typicalP?: number
+  useMLock?: boolean
+  useMMap?: boolean
+  vocabOnly?: boolean
 }
 
 const keys = [
-    "f16KV",
-    "frequencyPenalty",
-    "keepAlive",
-    "logitsAll",
-    "mirostat",
-    "mirostatEta",
-    "mirostatTau",
-    "numBatch",
-    "numCtx",
-    "numGpu",
-    "numGqa",
-    "numKeep",
-    "numPredict",
-    "numThread",
-    "penalizeNewline",
-    "presencePenalty",
-    "repeatLastN",
-    "repeatPenalty",
-    "ropeFrequencyBase",
-    "ropeFrequencyScale",
-    "temperature",
-    "tfsZ",
-    "topK",
-    "topP",
-    "typicalP",
-    "useMLock",
-    "useMMap",
-    "vocabOnly"
+  "f16KV",
+  "frequencyPenalty",
+  "keepAlive",
+  "logitsAll",
+  "mirostat",
+  "mirostatEta",
+  "mirostatTau",
+  "numBatch",
+  "numCtx",
+  "numGpu",
+  "numGqa",
+  "numKeep",
+  "numPredict",
+  "numThread",
+  "penalizeNewline",
+  "presencePenalty",
+  "repeatLastN",
+  "repeatPenalty",
+  "ropeFrequencyBase",
+  "ropeFrequencyScale",
+  "temperature",
+  "tfsZ",
+  "topK",
+  "topP",
+  "typicalP",
+  "useMLock",
+  "useMMap",
+  "vocabOnly"
 ]
 
 const getAllModelSettings = async () => {
-    try {
-        const settings: ModelSettings = {}
-        for (const key of keys) {
-            const value = await storage.get(key)
-            settings[key] = value
-            if (!value && key === "keepAlive") {
-                settings[key] = "5m"
-            }
-
-        }
-        return settings
-    } catch (error) {
-        console.error(error)
-        return {}
+  try {
+    const settings: ModelSettings = {}
+    for (const key of keys) {
+      const value = await storage.get(key)
+      settings[key] = value
+      if (!value && key === "keepAlive") {
+        settings[key] = "5m"
+      }
     }
+    return settings
+  } catch (error) {
+    console.error(error)
+    return {}
+  }
 }
 
-const setModelSetting = async (key: string,
-    value: string | number | boolean) => {
-    await storage.set(key, value)
+const setModelSetting = async (
+  key: string,
+  value: string | number | boolean
+) => {
+  await storage.set(key, value)
 }
 
 export const getAllDefaultModelSettings = async (): Promise<ModelSettings> => {
-    const settings: ModelSettings = {}
-    for (const key of keys) {
-        const value = await storage.get(key)
-        settings[key] = value
-        if (!value && key === "keepAlive") {
-            settings[key] = "5m"
-        }
+  const settings: ModelSettings = {}
+  for (const key of keys) {
+    const value = await storage.get(key)
+    settings[key] = value
+    if (!value && key === "keepAlive") {
+      settings[key] = "5m"
     }
-    return settings
+  }
+  return settings
 }
 
-export { getAllModelSettings, setModelSetting }
\ No newline at end of file
+export const lastUsedChatModelEnabled = async (): Promise<boolean> => {
+  const isLastUsedChatModelEnabled = await storage.get<boolean | undefined>(
+    "restoreLastChatModel"
+  )
+  return isLastUsedChatModelEnabled ?? false
+}
+
+export const setLastUsedChatModelEnabled = async (
+  enabled: boolean
+): Promise<void> => {
+  await storage.set("restoreLastChatModel", enabled)
+}
+
+export const getLastUsedChatModel = async (
+  historyId: string
+): Promise<string | undefined> => {
+  return await storage.get<string | undefined>(`lastUsedChatModel-${historyId}`)
+}
+
+export const setLastUsedChatModel = async (
+  historyId: string,
+  model: string
+): Promise<void> => {
+  await storage.set(`lastUsedChatModel-${historyId}`, model)
+}
+
+export { getAllModelSettings, setModelSetting }