diff --git a/README.md b/README.md
index e810e65c8..be1d3e594 100644
--- a/README.md
+++ b/README.md
@@ -292,12 +292,19 @@ anthropic claude Api Url.
 - 多个地址以`,`相连
 
 ### `DEFAULT_INPUT_TEMPLATE` （可选）
+
 自定义默认的 template，用于初始化『设置』中的『用户输入预处理』配置项
 
 ### `EDGE_TTS_VOICE_NAME` （可选）
+
 配置 Edge TTS 使用的语音声音，默认为：zh-CN-YunxiNeural
 可访问 https://learn.microsoft.com/zh-cn/azure/ai-services/speech-service/language-support?tabs=tts#supported-languages 查看支持的参数
 
+### `NEXT_PUBLIC_USE_OPENAI_ENDPOINT_FOR_ALL_MODELS` （可选）
+
+配置所有模型都使用 OpenAI 路由，在使用类似 `one-api` 的中转项目时会很有用
+将此环境变量设置为 1 即可
+
 ## 部署
 
 ### 容器部署 （推荐）
diff --git a/app/api/common.ts b/app/api/common.ts
index d1cd169d4..3a5929664 100644
--- a/app/api/common.ts
+++ b/app/api/common.ts
@@ -108,7 +108,7 @@ export async function requestOpenai(req: NextRequest) {
       fetchOptions.body = clonedBody;
 
       // not undefined and is false
-      if (modelTable[jsonBody?.model ?? ""].available === false) {
+      if (modelTable[jsonBody?.model ?? ""]?.available === false) {
         return NextResponse.json(
           {
             error: true,
diff --git a/app/client/api.ts b/app/client/api.ts
index 68a8e7dbf..6aaf9461b 100644
--- a/app/client/api.ts
+++ b/app/client/api.ts
@@ -216,7 +216,9 @@ export function getHeaders(ignoreHeaders?: boolean) {
   const accessStore = useAccessStore.getState();
   let headers: Record<string, string> = {};
   const modelConfig = useChatStore.getState().currentSession().mask.modelConfig;
-  const isGoogle = modelConfig.model.startsWith("gemini");
+  const isGoogle =
+    modelConfig.model.startsWith("gemini") &&
+    !!!process.env.NEXT_PUBLIC_USE_OPENAI_ENDPOINT_FOR_ALL_MODELS;
   if (!ignoreHeaders && !isGoogle) {
     headers = {
       "Content-Type": "application/json",
diff --git a/app/components/exporter.tsx b/app/components/exporter.tsx
index cc70af460..940322a73 100644
--- a/app/components/exporter.tsx
+++ b/app/components/exporter.tsx
@@ -15,6 +15,7 @@ import { IconButton } from "./button";
 import {
   copyToClipboard,
   downloadAs,
+  getClientApi,
   getMessageImages,
   useMobileScreen,
 } from "../utils";
@@ -313,14 +314,7 @@ export function PreviewActions(props: {
   const onRenderMsgs = (msgs: ChatMessage[]) => {
     setShouldExport(false);
 
-    var api: ClientApi;
-    if (config.modelConfig.model.startsWith("gemini")) {
-      api = new ClientApi(ModelProvider.GeminiPro);
-    } else if (identifyDefaultClaudeModel(config.modelConfig.model)) {
-      api = new ClientApi(ModelProvider.Claude);
-    } else {
-      api = new ClientApi(ModelProvider.GPT);
-    }
+    var api: ClientApi = getClientApi(config.modelConfig.model);
 
     api
       .share(msgs)
diff --git a/app/components/home.tsx b/app/components/home.tsx
index 88f25593b..30d1aad8e 100644
--- a/app/components/home.tsx
+++ b/app/components/home.tsx
@@ -9,7 +9,7 @@ import styles from "./home.module.scss";
 import BotIcon from "../icons/bot.svg";
 import LoadingIcon from "../icons/three-dots.svg";
 
-import { useMobileScreen } from "../utils";
+import { getClientApi, useMobileScreen } from "../utils";
 
 import dynamic from "next/dynamic";
 import { ModelProvider, Path, SlotID } from "../constant";
@@ -178,14 +178,8 @@ function Screen() {
 export function useLoadData() {
   const config = useAppConfig();
 
-  var api: ClientApi;
-  if (config.modelConfig.model.startsWith("gemini")) {
-    api = new ClientApi(ModelProvider.GeminiPro);
-  } else if (identifyDefaultClaudeModel(config.modelConfig.model)) {
-    api = new ClientApi(ModelProvider.Claude);
-  } else {
-    api = new ClientApi(ModelProvider.GPT);
-  }
+  var api: ClientApi = getClientApi(config.modelConfig.model);
+
   useEffect(() => {
     (async () => {
       const models = await api.llm.models();
diff --git a/app/store/chat.ts b/app/store/chat.ts
index 9e3675205..aa8193d43 100644
--- a/app/store/chat.ts
+++ b/app/store/chat.ts
@@ -1,4 +1,4 @@
-import { trimTopic, getMessageTextContent } from "../utils";
+import { trimTopic, getMessageTextContent, getClientApi } from "../utils";
 
 import Locale, { getLang } from "../locales";
 import { showToast } from "../components/ui-lib";
@@ -484,13 +484,6 @@ export const useChatStore = createPersistStore(
             agentCall();
           }
         } else {
-          if (modelConfig.model.startsWith("gemini")) {
-            api = new ClientApi(ModelProvider.GeminiPro);
-          } else if (identifyDefaultClaudeModel(modelConfig.model)) {
-            api = new ClientApi(ModelProvider.Claude);
-          } else {
-            api = new ClientApi(ModelProvider.GPT);
-          }
           // make request
           api.llm.chat({
             messages: sendMessages,
@@ -667,14 +660,7 @@ export const useChatStore = createPersistStore(
         const session = get().currentSession();
         const modelConfig = session.mask.modelConfig;
 
-        var api: ClientApi;
-        if (modelConfig.model.startsWith("gemini")) {
-          api = new ClientApi(ModelProvider.GeminiPro);
-        } else if (identifyDefaultClaudeModel(modelConfig.model)) {
-          api = new ClientApi(ModelProvider.Claude);
-        } else {
-          api = new ClientApi(ModelProvider.GPT);
-        }
+        var api: ClientApi = getClientApi(config.modelConfig.model);
 
         // remove error messages if any
         const messages = session.messages;
diff --git a/app/utils.ts b/app/utils.ts
index f3a8edac4..f229fa6ff 100644
--- a/app/utils.ts
+++ b/app/utils.ts
@@ -1,8 +1,9 @@
 import { useEffect, useState } from "react";
 import { showToast } from "./components/ui-lib";
 import Locale from "./locales";
-import { RequestMessage } from "./client/api";
-import { DEFAULT_MODELS } from "./constant";
+import { ClientApi, RequestMessage } from "./client/api";
+import { DEFAULT_MODELS, ModelProvider } from "./constant";
+import { identifyDefaultClaudeModel } from "./utils/checkers";
 
 export function trimTopic(topic: string) {
   // Fix an issue where double quotes still show in the Indonesian language
@@ -279,3 +280,17 @@ export function isSupportRAGModel(modelName: string) {
     (model) => model.name === modelName,
   );
 }
+
+export function getClientApi(modelName: string): ClientApi {
+  if (!!process.env.NEXT_PUBLIC_USE_OPENAI_ENDPOINT_FOR_ALL_MODELS)
+    return new ClientApi(ModelProvider.GPT);
+  var api: ClientApi;
+  if (modelName.startsWith("gemini")) {
+    api = new ClientApi(ModelProvider.GeminiPro);
+  } else if (identifyDefaultClaudeModel(modelName)) {
+    api = new ClientApi(ModelProvider.Claude);
+  } else {
+    api = new ClientApi(ModelProvider.GPT);
+  }
+  return api;
+}