diff --git a/backend/routes/chat_routes.py b/backend/routes/chat_routes.py
index f0919a235..953ce217a 100644
--- a/backend/routes/chat_routes.py
+++ b/backend/routes/chat_routes.py
@@ -195,6 +195,13 @@ async def create_question_handler(
         )
 
     # Retrieve user's OpenAI API key
+    if brain_id:
+        validate_brain_authorization(
+            brain_id=brain_id,
+            user_id=current_user.id,
+            required_roles=[RoleEnum.Viewer, RoleEnum.Editor, RoleEnum.Owner],
+        )
+
     current_user.openai_api_key = request.headers.get("Openai-Api-Key")
     brain = Brain(id=brain_id)
     brain_details: BrainEntity | None = None
diff --git a/frontend/app/chat/[chatId]/__tests__/page.test.tsx b/frontend/app/chat/[chatId]/__tests__/page.test.tsx
index 0311c9d46..b6f74d746 100644
--- a/frontend/app/chat/[chatId]/__tests__/page.test.tsx
+++ b/frontend/app/chat/[chatId]/__tests__/page.test.tsx
@@ -42,6 +42,22 @@ vi.mock("@/lib/api/chat/useChatApi", () => ({
     getHistory: () => [],
   }),
 }));
+
+vi.mock("@/lib/hooks", async () => {
+  const actual = await vi.importActual<typeof import("@/lib/hooks")>(
+    "@/lib/hooks"
+  );
+
+  return {
+    ...actual,
+    useAxios: () => ({
+      axiosInstance: {
+        get: vi.fn(() => ({ data: [] })),
+      },
+    }),
+  };
+});
+
 vi.mock("@tanstack/react-query", async () => {
   const actual = await vi.importActual<typeof import("@tanstack/react-query")>(
     "@tanstack/react-query"
diff --git a/frontend/app/chat/[chatId]/components/ActionsBar/components/ChatInput/components/ConfigModal/ConfigModal.tsx b/frontend/app/chat/[chatId]/components/ActionsBar/components/ChatInput/components/ConfigModal/ConfigModal.tsx
index 99bbb7b94..dfa46ce99 100644
--- a/frontend/app/chat/[chatId]/components/ActionsBar/components/ChatInput/components/ConfigModal/ConfigModal.tsx
+++ b/frontend/app/chat/[chatId]/components/ActionsBar/components/ChatInput/components/ConfigModal/ConfigModal.tsx
@@ -7,7 +7,7 @@ import { defineMaxTokens } from "@/lib/helpers/defineMaxTokens";
 
 import { useConfigModal } from "./hooks/useConfigModal";
 
-export const ConfigModal = ({ chatId }: { chatId?: string }): JSX.Element => {
+export const ConfigModal = (): JSX.Element => {
   const {
     handleSubmit,
     isConfigModalOpen,
@@ -17,11 +17,7 @@ export const ConfigModal = ({ chatId }: { chatId?: string }): JSX.Element => {
     maxTokens,
     model,
     accessibleModels,
-  } = useConfigModal(chatId);
-
-  if (chatId === undefined) {
-    return <div />;
-  }
+  } = useConfigModal();
 
   return (
     <Modal
@@ -79,7 +75,7 @@ export const ConfigModal = ({ chatId }: { chatId?: string }): JSX.Element => {
           <input
             type="range"
             min="10"
-            max={defineMaxTokens(model ?? "gpt-3.5-turbo")}
+            max={defineMaxTokens(model)}
             value={maxTokens}
             {...register("maxTokens")}
           />
diff --git a/frontend/app/chat/[chatId]/components/ActionsBar/components/ChatInput/components/ConfigModal/hooks/useConfigModal.ts b/frontend/app/chat/[chatId]/components/ActionsBar/components/ChatInput/components/ConfigModal/hooks/useConfigModal.ts
index 28b40c434..75b64af47 100644
--- a/frontend/app/chat/[chatId]/components/ActionsBar/components/ChatInput/components/ConfigModal/hooks/useConfigModal.ts
+++ b/frontend/app/chat/[chatId]/components/ActionsBar/components/ChatInput/components/ConfigModal/hooks/useConfigModal.ts
@@ -1,28 +1,27 @@
 /* eslint-disable max-lines */
 import { useQuery } from "@tanstack/react-query";
-import { useEffect, useState } from "react";
+import { useCallback, useEffect, useState } from "react";
 import { useForm } from "react-hook-form";
 
 import { useBrainApi } from "@/lib/api/brain/useBrainApi";
 import {
-  getChatConfigFromLocalStorage,
-  saveChatConfigInLocalStorage,
+  getChatsConfigFromLocalStorage,
+  saveChatsConfigInLocalStorage,
 } from "@/lib/api/chat/chat.local";
 import { USER_DATA_KEY, USER_IDENTITY_DATA_KEY } from "@/lib/api/user/config";
 import { useUserApi } from "@/lib/api/user/useUserApi";
 import { defaultBrainConfig } from "@/lib/config/defaultBrainConfig";
 import { useBrainContext } from "@/lib/context/BrainProvider/hooks/useBrainContext";
 import { ChatConfig } from "@/lib/context/ChatProvider/types";
-import { defineMaxTokens } from "@/lib/helpers/defineMaxTokens";
 import { getAccessibleModels } from "@/lib/helpers/getAccessibleModels";
 import { useToast } from "@/lib/hooks";
 
 // eslint-disable-next-line @typescript-eslint/explicit-module-boundary-types
-export const useConfigModal = (chatId?: string) => {
+export const useConfigModal = () => {
   const { publish } = useToast();
   const [isConfigModalOpen, setIsConfigModalOpen] = useState(false);
   const { getBrain } = useBrainApi();
-  const { currentBrain } = useBrainContext();
+  const { currentBrainId } = useBrainContext();
   const { getUser, getUserIdentity } = useUserApi();
 
   const { data: userData } = useQuery({
@@ -34,10 +33,12 @@ export const useConfigModal = (chatId?: string) => {
     queryFn: getUserIdentity,
   });
 
-  const defaultValues: ChatConfig = {};
-
-  const { register, watch, setValue } = useForm({
-    defaultValues,
+  const { register, watch, setValue } = useForm<ChatConfig>({
+    defaultValues: {
+      model: defaultBrainConfig.model,
+      temperature: defaultBrainConfig.temperature,
+      maxTokens: defaultBrainConfig.maxTokens,
+    },
   });
 
   const model = watch("model");
@@ -49,54 +50,40 @@ export const useConfigModal = (chatId?: string) => {
     userData,
   });
 
-  useEffect(() => {
-    const fetchChatConfig = async () => {
-      if (chatId === undefined) {
+  const fetchChatConfig = useCallback(async () => {
+    const chatConfig = getChatsConfigFromLocalStorage();
+    if (chatConfig !== undefined) {
+      setValue("model", chatConfig.model);
+      setValue("temperature", chatConfig.temperature);
+      setValue("maxTokens", chatConfig.maxTokens);
+    } else {
+      if (currentBrainId === null) {
         return;
       }
+      const relatedBrainConfig = await getBrain(currentBrainId);
 
-      const chatConfig = getChatConfigFromLocalStorage(chatId);
-      if (chatConfig !== undefined) {
-        setValue("model", chatConfig.model);
-        setValue("temperature", chatConfig.temperature);
-        setValue("maxTokens", chatConfig.maxTokens);
-      } else {
-        if (currentBrain === undefined) {
-          return;
-        }
-
-        const relatedBrainConfig = await getBrain(currentBrain.id);
-        if (relatedBrainConfig === undefined) {
-          return;
-        }
-        setValue("model", relatedBrainConfig.model ?? defaultBrainConfig.model);
-        setValue(
-          "temperature",
-          relatedBrainConfig.temperature ?? defaultBrainConfig.temperature
-        );
-        setValue(
-          "maxTokens",
-          relatedBrainConfig.max_tokens ?? defaultBrainConfig.maxTokens
-        );
+      if (relatedBrainConfig === undefined) {
+        return;
       }
-    };
-    void fetchChatConfig();
+      setValue("model", relatedBrainConfig.model ?? defaultBrainConfig.model);
+      setValue(
+        "temperature",
+        relatedBrainConfig.temperature ?? defaultBrainConfig.temperature
+      );
+      setValue(
+        "maxTokens",
+        relatedBrainConfig.max_tokens ?? defaultBrainConfig.maxTokens
+      );
+    }
   }, []);
 
   useEffect(() => {
-    if (maxTokens === undefined || model === undefined) {
-      return;
-    }
+    void fetchChatConfig();
+  }, [fetchChatConfig]);
 
-    setValue("maxTokens", Math.min(maxTokens, defineMaxTokens(model)));
-  }, [maxTokens, model, setValue]);
-
-  const handleSubmit = () => {
-    if (chatId === undefined) {
-      return;
-    }
+  const handleSubmit = useCallback(() => {
     try {
-      saveChatConfigInLocalStorage(chatId, {
+      saveChatsConfigInLocalStorage({
         maxTokens,
         model,
         temperature,
@@ -112,7 +99,7 @@ export const useConfigModal = (chatId?: string) => {
         text: "An error occurred while updating chat config",
       });
     }
-  };
+  }, [maxTokens, model, publish, temperature]);
 
   return {
     isConfigModalOpen,
diff --git a/frontend/app/chat/[chatId]/components/ActionsBar/components/ChatInput/index.tsx b/frontend/app/chat/[chatId]/components/ActionsBar/components/ChatInput/index.tsx
index dc3f0ae24..e48c7c92a 100644
--- a/frontend/app/chat/[chatId]/components/ActionsBar/components/ChatInput/index.tsx
+++ b/frontend/app/chat/[chatId]/components/ActionsBar/components/ChatInput/index.tsx
@@ -25,7 +25,7 @@ export const ChatInput = ({
   setShouldDisplayUploadCard,
   hasContentToFeedBrain,
 }: ChatInputProps): JSX.Element => {
-  const { setMessage, submitQuestion, chatId, generatingAnswer, message } =
+  const { setMessage, submitQuestion, generatingAnswer, message } =
     useChatInput();
   const { t } = useTranslation(["chat"]);
   const { currentBrainId } = useBrainContext();
@@ -80,7 +80,7 @@ export const ChatInput = ({
           <>
             {isEmptyMessage ? (
               <div className="md:hidden flex items-center">
-                <ConfigModal chatId={chatId} />
+                <ConfigModal />
               </div>
             ) : (
               <Button
@@ -95,7 +95,7 @@ export const ChatInput = ({
               </Button>
             )}
             <div className="hidden md:flex items-center">
-              <ConfigModal chatId={chatId} />
+              <ConfigModal />
             </div>
           </>
         )}
diff --git a/frontend/app/chat/[chatId]/hooks/useChat.ts b/frontend/app/chat/[chatId]/hooks/useChat.ts
index e3b1cf34c..8cf272a06 100644
--- a/frontend/app/chat/[chatId]/hooks/useChat.ts
+++ b/frontend/app/chat/[chatId]/hooks/useChat.ts
@@ -4,7 +4,7 @@ import { useParams, useRouter } from "next/navigation";
 import { useState } from "react";
 import { useTranslation } from "react-i18next";
 
-import { getChatConfigFromLocalStorage } from "@/lib/api/chat/chat.local";
+import { getChatsConfigFromLocalStorage } from "@/lib/api/chat/chat.local";
 import { useChatApi } from "@/lib/api/chat/useChatApi";
 import { useChatContext } from "@/lib/context";
 import { useBrainContext } from "@/lib/context/BrainProvider/hooks/useBrainContext";
@@ -64,7 +64,7 @@ export const useChat = () => {
         promptId: currentPromptId,
       });
 
-      const chatConfig = getChatConfigFromLocalStorage(currentChatId);
+      const chatConfig = getChatsConfigFromLocalStorage();
 
       const chatQuestion: ChatQuestion = {
         model: chatConfig?.model,
diff --git a/frontend/app/chat/[chatId]/page.tsx b/frontend/app/chat/[chatId]/page.tsx
index d8c437376..1261c9c0e 100644
--- a/frontend/app/chat/[chatId]/page.tsx
+++ b/frontend/app/chat/[chatId]/page.tsx
@@ -6,17 +6,20 @@ import { ChatHeader } from "./components/ChatHeader";
 
 const SelectedChatPage = (): JSX.Element => {
   return (
-    <main className="flex flex-col w-full h-[calc(100vh-61px)] overflow-hidden" data-testid="chat-page">
-    <section className="flex flex-col flex-1 items-center w-full h-full overflow-y-auto">
-        <ChatHeader /> {/* Added margin-bottom */}
+    <main
+      className="flex flex-col w-full h-[calc(100vh-61px)] overflow-hidden"
+      data-testid="chat-page"
+    >
+      <section className="flex flex-col flex-1 items-center w-full h-full overflow-y-auto">
+        <ChatHeader />
         <div className="flex-1 flex flex-col mt-4 md:mt-8 w-full shadow-md dark:shadow-primary/25 hover:shadow-xl transition-shadow rounded-xl overflow-hidden bg-white dark:bg-black border border-black/10 dark:border-white/25 p-2 md:p-12 pt-4 md:pt-10">
-            <div className="flex flex-1 flex-col overflow-y-auto">
-                <ChatDialogueArea />
-            </div>
-            <ActionsBar/> {/* Added margin-top */}
+          <div className="flex flex-1 flex-col overflow-y-auto">
+            <ChatDialogueArea />
+          </div>
+          <ActionsBar />
         </div>
-    </section>
-  </main>
+      </section>
+    </main>
   );
 };
 
diff --git a/frontend/lib/api/chat/chat.local.ts b/frontend/lib/api/chat/chat.local.ts
index d5cf34ae4..f5d914690 100644
--- a/frontend/lib/api/chat/chat.local.ts
+++ b/frontend/lib/api/chat/chat.local.ts
@@ -1,16 +1,11 @@
 import { ChatConfig } from "@/lib/context/ChatProvider/types";
-
-export const saveChatConfigInLocalStorage = (
-  chatId: string,
-  chatConfig: ChatConfig
-): void => {
-  localStorage.setItem(`chat-config-${chatId}`, JSON.stringify(chatConfig));
+const chatConfigLocalStorageKey = "chat-config";
+export const saveChatsConfigInLocalStorage = (chatConfig: ChatConfig): void => {
+  localStorage.setItem(chatConfigLocalStorageKey, JSON.stringify(chatConfig));
 };
 
-export const getChatConfigFromLocalStorage = (
-  chatId: string
-): ChatConfig | undefined => {
-  const config = localStorage.getItem(`chat-config-${chatId}`);
+export const getChatsConfigFromLocalStorage = (): ChatConfig | undefined => {
+  const config = localStorage.getItem(chatConfigLocalStorageKey);
 
   if (config === null) {
     return undefined;
diff --git a/frontend/lib/context/ChatProvider/types.ts b/frontend/lib/context/ChatProvider/types.ts
index d7705bbaa..b6af853b3 100644
--- a/frontend/lib/context/ChatProvider/types.ts
+++ b/frontend/lib/context/ChatProvider/types.ts
@@ -3,9 +3,9 @@ import { ChatMessage, Notification } from "@/app/chat/[chatId]/types";
 import { Model } from "../../types/brainConfig";
 
 export type ChatConfig = {
-  model?: Model;
-  temperature?: number;
-  maxTokens?: number;
+  model: Model;
+  temperature: number;
+  maxTokens: number;
 };
 
 export type ChatContextProps = {