Add GPT-4o result to the leaderboard

leaderboard/leaderboard.json

@@ -1,5 +1,28 @@
 {
     "models": [
+      {
+        "name": "GPT-4o",
+        "url": "https://openai.com/index/hello-gpt-4o",
+        "scores": {
+          "Mean": 0.359,
+          "Exist": 0.400,
+          "Count": 0.388,
+          "Posi": 0.398,
+          "Col": 0.421,
+          "Post": 0.335,
+          "Cel": 0.331,
+          "Sce": 0.401,
+          "Lan": 0.372,
+          "Art": 0.415,
+          "Comm": 0.448,
+          "VisMean": 0.391,
+          "Code": 0.255,
+          "Num": 0.282,
+          "Tran": 0.211,
+          "OCR": 0.362,
+          "TextMean": 0.278
+        }
+      },
       {
         "name": "Gemini1.5-Pro",
         "url": "https://deepmind.google/technologies/gemini",