updated to new model

app.py

@@ -40,7 +40,7 @@ def encode_image_to_base64(image: np.ndarray) -> str:
 def compose_payload(image: np.ndarray, prompt: str) -> dict:
     base64_image = encode_image_to_base64(image)
     return {
-        "model": "gpt-4-vision-preview",
+        "model": "gpt-4o",
         "messages": [
             {
                 "role": "user",