Update app.py

app.py

@@ -32,7 +32,7 @@ class PDFTextExtractor:
                 img_base64 = base64.b64encode(img_buffer.getvalue()).decode('utf-8')
                 
                 response = self.client.chat.completions.create(
-                    model="gpt-4-vision-preview",
+                    model="gpt-4-turbo",
                     messages=[
                         {
                             "role": "system",