diff --git a/README.md b/README.md
index d4e304f9..3050fcc9 100644
--- a/README.md
+++ b/README.md
@@ -161,7 +161,7 @@ Access password, separated by comma.
 
 ### `OPENAI_API_KEY` (required)
 
-Your openai api key.
+Your openai api key, join multiple api keys with comma.
 
 ### `BASE_URL` (optional)
 
@@ -216,9 +216,11 @@ If you want to disable parse settings from url, set this to 1.
 ### `CUSTOM_MODELS` (optional)
 
 > Default: Empty
-> Example: `+llama,+claude-2,-gpt-3.5-turbo,gpt-4-1106-preview:gpt-4-turbo` means add `llama, claude-2` to model list, and remove `gpt-3.5-turbo` from list, and display `gpt-4-1106-preview` as `gpt-4-turbo`.
+> Example: `+llama,+claude-2,-gpt-3.5-turbo,gpt-4-1106-preview=gpt-4-turbo` means add `llama, claude-2` to model list, and remove `gpt-3.5-turbo` from list, and display `gpt-4-1106-preview` as `gpt-4-turbo`.
 
-To control custom models, use `+` to add a custom model, use `-` to hide a model, use `name:displayName` to customize model name, separated by comma.
+To control custom models, use `+` to add a custom model, use `-` to hide a model, use `name=displayName` to customize model name, separated by comma.
+
+User `-all` to disable all default models, `+all` to enable all default models.
 
 ## Requirements
 
diff --git a/README_CN.md b/README_CN.md
index dde8c19b..0ef508f6 100644
--- a/README_CN.md
+++ b/README_CN.md
@@ -68,7 +68,7 @@ code1,code2,code3
 
 ### `OPENAI_API_KEY` （必填项）
 
-OpanAI 密钥，你在 openai 账户页面申请的 api key。
+OpanAI 密钥，你在 openai 账户页面申请的 api key，使用英文逗号隔开多个 key，这样可以随机轮询这些 key。
 
 ### `CODE` （可选）
 
@@ -122,9 +122,10 @@ Azure Api 版本，你可以在这里找到：[Azure 文档](https://learn.micro
 
 ### `CUSTOM_MODELS` （可选）
 
-> 示例：`+qwen-7b-chat,+glm-6b,-gpt-3.5-turbo,gpt-4-1106-preview:gpt-4-turbo` 表示增加 `qwen-7b-chat` 和 `glm-6b` 到模型列表，而从列表中删除 `gpt-3.5-turbo`，并将 `gpt-4-1106-preview` 模型名字展示为 `gpt-4-turbo`。
+> 示例：`+qwen-7b-chat,+glm-6b,-gpt-3.5-turbo,gpt-4-1106-preview=gpt-4-turbo` 表示增加 `qwen-7b-chat` 和 `glm-6b` 到模型列表，而从列表中删除 `gpt-3.5-turbo`，并将 `gpt-4-1106-preview` 模型名字展示为 `gpt-4-turbo`。
+> 如果你想先禁用所有模型，再启用指定模型，可以使用 `-all,+gpt-3.5-turbo`，则表示仅启用 `gpt-3.5-turbo`
 
-用来控制模型列表，使用 `+` 增加一个模型，使用 `-` 来隐藏一个模型，使用 `模型名:展示名` 来自定义模型的展示名，用英文逗号隔开。
+用来控制模型列表，使用 `+` 增加一个模型，使用 `-` 来隐藏一个模型，使用 `模型名=展示名` 来自定义模型的展示名，用英文逗号隔开。
 
 ## 开发
 
diff --git a/app/client/platforms/openai.ts b/app/client/platforms/openai.ts
index 930d6069..dc79d2ce 100644
--- a/app/client/platforms/openai.ts
+++ b/app/client/platforms/openai.ts
@@ -115,12 +115,33 @@ export class ChatGPTApi implements LLMApi {
 
       if (shouldStream) {
         let responseText = "";
+        let remainText = "";
         let finished = false;
 
+        // animate response to make it looks smooth
+        function animateResponseText() {
+          if (finished || controller.signal.aborted) {
+            responseText += remainText;
+            console.log("[Response Animation] finished");
+            return;
+          }
+
+          if (remainText.length > 0) {
+            responseText += remainText[0];
+            remainText = remainText.slice(1);
+            options.onUpdate?.(responseText, remainText[0]);
+          }
+
+          requestAnimationFrame(animateResponseText);
+        }
+
+        // start animaion
+        animateResponseText();
+
         const finish = () => {
           if (!finished) {
-            options.onFinish(responseText);
             finished = true;
+            options.onFinish(responseText + remainText);
           }
         };
 
@@ -183,8 +204,7 @@ export class ChatGPTApi implements LLMApi {
               };
               const delta = json.choices[0]?.delta?.content;
               if (delta) {
-                responseText += delta;
-                options.onUpdate?.(responseText, delta);
+                remainText += delta;
               }
             } catch (e) {
               console.error("[Request] parse error", text);
diff --git a/app/config/server.ts b/app/config/server.ts
index 2f2e7d7f..2398805a 100644
--- a/app/config/server.ts
+++ b/app/config/server.ts
@@ -62,9 +62,17 @@ export const getServerSideConfig = () => {
 
   const isAzure = !!process.env.AZURE_URL;
 
+  const apiKeyEnvVar = process.env.OPENAI_API_KEY ?? "";
+  const apiKeys = apiKeyEnvVar.split(",").map((v) => v.trim());
+  const randomIndex = Math.floor(Math.random() * apiKeys.length);
+  const apiKey = apiKeys[randomIndex];
+  console.log(
+    `[Server Config] using ${randomIndex + 1} of ${apiKeys.length} api key`,
+  );
+
   return {
     baseUrl: process.env.BASE_URL,
-    apiKey: process.env.OPENAI_API_KEY,
+    apiKey,
     openaiOrgId: process.env.OPENAI_ORG_ID,
 
     isAzure,
diff --git a/app/utils/model.ts b/app/utils/model.ts
index d5c009c0..74b28a66 100644
--- a/app/utils/model.ts
+++ b/app/utils/model.ts
@@ -26,7 +26,13 @@ export function collectModelTable(
       const available = !m.startsWith("-");
       const nameConfig =
         m.startsWith("+") || m.startsWith("-") ? m.slice(1) : m;
-      const [name, displayName] = nameConfig.split(":");
+      const [name, displayName] = nameConfig.split("=");
+
+      // enable or disable all models
+      if (name === "all") {
+        Object.values(modelTable).forEach((m) => (m.available = available));
+      }
+
       modelTable[name] = {
         name,
         displayName: displayName || name,