feat: 当用gpt-4的API 时增加可用的 Max Tokens (#729)

* fix: 用GPT-4 API时增加max token

* style: eslint fix

---------

Co-authored-by: Redon <790348264@qq.com>

service/src/chatgpt/index.ts

@@ -45,6 +45,19 @@ let api: ChatGPTAPI | ChatGPTUnofficialProxyAPI
       debug: true,
     }
 
+    // increase max token limit if use gpt-4
+    if (model.toLowerCase().includes('gpt-4')) {
+      // if use 32k model
+      if (model.toLowerCase().includes('32k')) {
+        options.maxModelTokens = 32768
+        options.maxResponseTokens = 8192
+      }
+      else {
+        options.maxModelTokens = 8192
+        options.maxResponseTokens = 2048
+      }
+    }
+
     if (isNotEmptyString(OPENAI_API_BASE_URL))
       options.apiBaseUrl = `${OPENAI_API_BASE_URL}/v1`