diff --git a/app/client/platforms/openai.ts b/app/client/platforms/openai.ts
index 4f4a4e125..af1514942 100644
--- a/app/client/platforms/openai.ts
+++ b/app/client/platforms/openai.ts
@@ -224,7 +224,7 @@ export class ChatGPTApi implements LLMApi {
 
       // add max_tokens to vision model
       if (visionModel && finalModel.includes("preview")) {
-        requestPayload["max_tokens"] = Math.max(finalModel.max_tokens, 4000);
+        requestPayload["max_tokens"] = Math.max(modelConfig.max_tokens, 4000);
       }
     }