diff --git a/service/src/storage/config.ts b/service/src/storage/config.ts
index 37b3c796..38cf71a4 100644
--- a/service/src/storage/config.ts
+++ b/service/src/storage/config.ts
@@ -32,7 +32,7 @@ export async function getOriginConfig() {
       process.env.OPENAI_API_DISABLE_DEBUG === 'true',
       process.env.OPENAI_ACCESS_TOKEN,
       process.env.OPENAI_API_BASE_URL,
-      process.env.OPENAI_API_MODEL === 'ChatGPTUnofficialProxyAPI' ? 'ChatGPTUnofficialProxyAPI' : 'ChatGPTAPI',
+      'ChatGPTAPI',
       process.env.API_REVERSE_PROXY,
       (process.env.SOCKS_PROXY_HOST && process.env.SOCKS_PROXY_PORT)
         ? (`${process.env.SOCKS_PROXY_HOST}:${process.env.SOCKS_PROXY_PORT}`)
@@ -76,12 +76,6 @@ export async function getOriginConfig() {
     if (config.siteConfig.registerReview === undefined)
       config.siteConfig.registerReview = process.env.REGISTER_REVIEW === 'true'
   }
-  if (config.apiModel !== 'ChatGPTAPI' && config.apiModel !== 'ChatGPTUnofficialProxyAPI') {
-    if (isNotEmptyString(config.accessToken))
-      config.apiModel = 'ChatGPTUnofficialProxyAPI'
-    else
-      config.apiModel = 'ChatGPTAPI'
-  }
 
   if (config.auditConfig === undefined) {
     config.auditConfig = new AuditConfig(
@@ -102,7 +96,7 @@ export async function getOriginConfig() {
 
   if (!config.advancedConfig) {
     config.advancedConfig = new AdvancedConfig(
-      'You are ChatGPT, a large language model trained by OpenAI. Follow the user\'s instructions carefully.Respond using markdown (latex start with $).',
+      'You are a large language model. Follow the user\'s instructions carefully. Respond using markdown (latex start with $).',
       0.8,
       1,
       20,
diff --git a/src/store/modules/settings/helper.ts b/src/store/modules/settings/helper.ts
index 0533392f..6b80fd18 100644
--- a/src/store/modules/settings/helper.ts
+++ b/src/store/modules/settings/helper.ts
@@ -10,7 +10,7 @@ export interface SettingsState {
 
 export function defaultSetting(): SettingsState {
   return {
-    systemMessage: 'You are ChatGPT, a large language model trained by OpenAI. Follow the user\'s instructions carefully. Respond using markdown.',
+    systemMessage: 'You are a large language model. Follow the user\'s instructions carefully. Respond using markdown(latex start with $).',
     temperature: 0.8,
     top_p: 1,
   }
diff --git a/src/store/modules/user/helper.ts b/src/store/modules/user/helper.ts
index a44aa175..9af78692 100644
--- a/src/store/modules/user/helper.ts
+++ b/src/store/modules/user/helper.ts
@@ -38,7 +38,7 @@ export function defaultSetting(): UserState {
       config: { chatModel: 'gpt-3.5-turbo' },
       roles: [],
       advanced: {
-        systemMessage: 'You are ChatGPT, a large language model trained by OpenAI. Follow the user\'s instructions carefully. Respond using markdown.',
+        systemMessage: 'You are a large language model. Follow the user\'s instructions carefully. Respond using markdown (latex start with $).',
         temperature: 0.8,
         top_p: 1,
         maxContextCount: 20,
@@ -57,7 +57,7 @@ export function getLocalState(): UserState {
     }
     if (!localSetting.userInfo.advanced) {
       localSetting.userInfo.advanced = {
-        systemMessage: 'You are ChatGPT, a large language model trained by OpenAI. Follow the user\'s instructions carefully. Respond using markdown.',
+        systemMessage: 'You are a large language model. Follow the user\'s instructions carefully. Respond using markdown (latex start with $).',
         temperature: 0.8,
         top_p: 1,
         maxContextCount: 20,