remove max_tokens from the official version of gpt4-turbo

app/client/platforms/openai.ts

@@ -129,7 +129,7 @@ export class ChatGPTApi implements LLMApi {
     };
 
     // add max_tokens to vision model
-    if (visionModel) {
+    if (visionModel && modelConfig.model.includes("preview")) {
       requestPayload["max_tokens"] = Math.max(modelConfig.max_tokens, 4000);
     }