diff --git a/components/Sidebar/Key.tsx b/components/Sidebar/Key.tsx
new file mode 100644
index 0000000..7a197bf
--- /dev/null
+++ b/components/Sidebar/Key.tsx
@@ -0,0 +1,66 @@
+import { IconCheck, IconKey, IconX } from "@tabler/icons-react";
+import { FC, KeyboardEvent, useState } from "react";
+import { SidebarButton } from "./SidebarButton";
+
+interface Props {
+  apiKey: string;
+  onApiKeyChange: (apiKey: string) => void;
+}
+
+export const Key: FC<Props> = ({ apiKey, onApiKeyChange }) => {
+  const [isChanging, setIsChanging] = useState(false);
+  const [newKey, setNewKey] = useState(apiKey);
+
+  const handleEnterDown = (e: KeyboardEvent<HTMLDivElement>) => {
+    if (e.key === "Enter") {
+      e.preventDefault();
+      handleUpdateKey(newKey);
+    }
+  };
+
+  const handleUpdateKey = (newKey: string) => {
+    onApiKeyChange(newKey);
+    setIsChanging(false);
+  };
+
+  return isChanging ? (
+    <div className="flex hover:bg-[#343541] py-2 px-2 rounded-md cursor-pointer w-full items-center">
+      <IconKey size={16} />
+
+      <input
+        className="ml-2 flex-1 bg-transparent border-b border-neutral-400 focus:border-neutral-100 text-left overflow-hidden overflow-ellipsis pr-1 outline-none text-white"
+        type="password"
+        value={newKey}
+        onChange={(e) => setNewKey(e.target.value)}
+        onKeyDown={handleEnterDown}
+      />
+
+      <div className="flex w-[40px]">
+        <IconCheck
+          className="ml-auto min-w-[20px] text-neutral-400 hover:text-neutral-100"
+          size={18}
+          onClick={(e) => {
+            e.stopPropagation();
+            handleUpdateKey(newKey);
+          }}
+        />
+
+        <IconX
+          className="ml-auto min-w-[20px] text-neutral-400 hover:text-neutral-100"
+          size={18}
+          onClick={(e) => {
+            e.stopPropagation();
+            setIsChanging(false);
+            setNewKey(apiKey);
+          }}
+        />
+      </div>
+    </div>
+  ) : (
+    <SidebarButton
+      text="OpenAI API Key"
+      icon={<IconKey size={16} />}
+      onClick={() => setIsChanging(true)}
+    />
+  );
+};
diff --git a/components/Sidebar/Sidebar.tsx b/components/Sidebar/Sidebar.tsx
index 0ad5436..dac2f5b 100644
--- a/components/Sidebar/Sidebar.tsx
+++ b/components/Sidebar/Sidebar.tsx
@@ -9,15 +9,17 @@ interface Props {
   conversations: Conversation[];
   lightMode: "light" | "dark";
   selectedConversation: Conversation;
+  apiKey: string;
   onNewConversation: () => void;
   onToggleLightMode: (mode: "light" | "dark") => void;
   onSelectConversation: (conversation: Conversation) => void;
   onDeleteConversation: (conversation: Conversation) => void;
   onToggleSidebar: () => void;
   onRenameConversation: (conversation: Conversation, name: string) => void;
+  onApiKeyChange: (apiKey: string) => void;
 }
 
-export const Sidebar: FC<Props> = ({ loading, conversations, lightMode, selectedConversation, onNewConversation, onToggleLightMode, onSelectConversation, onDeleteConversation, onToggleSidebar, onRenameConversation }) => {
+export const Sidebar: FC<Props> = ({ loading, conversations, lightMode, selectedConversation, apiKey, onNewConversation, onToggleLightMode, onSelectConversation, onDeleteConversation, onToggleSidebar, onRenameConversation, onApiKeyChange }) => {
   return (
     <div className="flex flex-col bg-[#202123] min-w-[260px] max-w-[260px]">
       <div className="flex items-center h-[60px] pl-2">
@@ -52,7 +54,9 @@ export const Sidebar: FC<Props> = ({ loading, conversations, lightMode, selected
 
       <SidebarSettings
         lightMode={lightMode}
+        apiKey={apiKey}
         onToggleLightMode={onToggleLightMode}
+        onApiKeyChange={onApiKeyChange}
       />
     </div>
   );
diff --git a/components/Sidebar/SidebarSettings.tsx b/components/Sidebar/SidebarSettings.tsx
index 38c42b3..c6e383f 100644
--- a/components/Sidebar/SidebarSettings.tsx
+++ b/components/Sidebar/SidebarSettings.tsx
@@ -1,20 +1,27 @@
-import { IconMoon, IconSun, IconTrash } from "@tabler/icons-react";
+import { IconMoon, IconSun } from "@tabler/icons-react";
 import { FC } from "react";
+import { Key } from "./Key";
 import { SidebarButton } from "./SidebarButton";
 
 interface Props {
   lightMode: "light" | "dark";
+  apiKey: string;
   onToggleLightMode: (mode: "light" | "dark") => void;
+  onApiKeyChange: (apiKey: string) => void;
 }
 
-export const SidebarSettings: FC<Props> = ({ lightMode, onToggleLightMode }) => {
+export const SidebarSettings: FC<Props> = ({ lightMode, apiKey, onToggleLightMode, onApiKeyChange }) => {
   return (
-    <div className="flex flex-col items-center border-t border-neutral-500 p-2 text-sm">
+    <div className="flex flex-col items-center border-t border-neutral-500 px-2 py-4 text-sm space-y-4">
       <SidebarButton
         text={lightMode === "light" ? "Dark mode" : "Light mode"}
         icon={lightMode === "light" ? <IconMoon size={16} /> : <IconSun size={16} />}
         onClick={() => onToggleLightMode(lightMode === "light" ? "dark" : "light")}
       />
+      <Key
+        apiKey={apiKey}
+        onApiKeyChange={onApiKeyChange}
+      />
     </div>
   );
 };
diff --git a/pages/api/chat.ts b/pages/api/chat.ts
index 987062f..a241c81 100644
--- a/pages/api/chat.ts
+++ b/pages/api/chat.ts
@@ -7,9 +7,10 @@ export const config = {
 
 const handler = async (req: Request): Promise<Response> => {
   try {
-    const { model, messages } = (await req.json()) as {
+    const { model, messages, key } = (await req.json()) as {
       model: OpenAIModel;
       messages: Message[];
+      key: string;
     };
 
     const charLimit = 12000;
@@ -25,7 +26,7 @@ const handler = async (req: Request): Promise<Response> => {
       messagesToSend.push(message);
     }
 
-    const stream = await OpenAIStream(model, messagesToSend);
+    const stream = await OpenAIStream(model, key, messagesToSend);
 
     return new Response(stream);
   } catch (error) {
diff --git a/pages/index.tsx b/pages/index.tsx
index 79044c5..080208e 100644
--- a/pages/index.tsx
+++ b/pages/index.tsx
@@ -13,6 +13,7 @@ export default function Home() {
   const [lightMode, setLightMode] = useState<"dark" | "light">("dark");
   const [messageIsStreaming, setMessageIsStreaming] = useState<boolean>(false);
   const [showSidebar, setShowSidebar] = useState<boolean>(true);
+  const [apiKey, setApiKey] = useState<string>("");
 
   const handleSend = async (message: Message) => {
     if (selectedConversation) {
@@ -32,7 +33,8 @@ export default function Home() {
         },
         body: JSON.stringify({
           model,
-          messages: updatedConversation.messages
+          messages: updatedConversation.messages,
+          key: apiKey
         })
       });
 
@@ -184,12 +186,22 @@ export default function Home() {
     }
   };
 
+  const handleApiKeyChange = (apiKey: string) => {
+    setApiKey(apiKey);
+    localStorage.setItem("apiKey", apiKey);
+  };
+
   useEffect(() => {
     const theme = localStorage.getItem("theme");
     if (theme) {
       setLightMode(theme as "dark" | "light");
     }
 
+    const apiKey = localStorage.getItem("apiKey");
+    if (apiKey) {
+      setApiKey(apiKey);
+    }
+
     const conversationHistory = localStorage.getItem("conversationHistory");
 
     if (conversationHistory) {
@@ -234,12 +246,14 @@ export default function Home() {
               conversations={conversations}
               lightMode={lightMode}
               selectedConversation={selectedConversation}
+              apiKey={apiKey}
               onToggleLightMode={handleLightMode}
               onNewConversation={handleNewConversation}
               onSelectConversation={handleSelectConversation}
               onDeleteConversation={handleDeleteConversation}
               onToggleSidebar={() => setShowSidebar(!showSidebar)}
               onRenameConversation={handleRenameConversation}
+              onApiKeyChange={handleApiKeyChange}
             />
           ) : (
             <IconArrowBarRight
diff --git a/utils/index.ts b/utils/index.ts
index 895d3f8..ba50769 100644
--- a/utils/index.ts
+++ b/utils/index.ts
@@ -1,14 +1,14 @@
 import { Message, OpenAIModel } from "@/types";
 import { createParser, ParsedEvent, ReconnectInterval } from "eventsource-parser";
 
-export const OpenAIStream = async (model: OpenAIModel, messages: Message[]) => {
+export const OpenAIStream = async (model: OpenAIModel, key: string, messages: Message[]) => {
   const encoder = new TextEncoder();
   const decoder = new TextDecoder();
 
   const res = await fetch("https://api.openai.com/v1/chat/completions", {
     headers: {
       "Content-Type": "application/json",
-      Authorization: `Bearer ${process.env.OPENAI_API_KEY}`
+      Authorization: `Bearer ${key ? key : process.env.OPENAI_API_KEY}`
     },
     method: "POST",
     body: JSON.stringify({