diff --git a/src/models.json b/src/models.json
index 6436bdc..4386247 100644
--- a/src/models.json
+++ b/src/models.json
@@ -70,6 +70,30 @@
       "max_output_tokens": 64000
     }
   },
+  {
+    "id": "gpt-5.3-codex-plus-pro-medium",
+    "handle": "chatgpt-plus-pro/gpt-5.3-codex",
+    "label": "GPT-5.3 Codex",
+    "description": "GPT-5.3 Codex (med reasoning) via ChatGPT Plus/Pro",
+    "updateArgs": {
+      "reasoning_effort": "medium",
+      "verbosity": "medium",
+      "context_window": 272000,
+      "max_output_tokens": 128000
+    }
+  },
+  {
+    "id": "gpt-5.3-codex-plus-pro-high",
+    "handle": "chatgpt-plus-pro/gpt-5.3-codex",
+    "label": "GPT-5.3 Codex",
+    "description": "GPT-5.3 Codex (high reasoning) via ChatGPT Plus/Pro",
+    "updateArgs": {
+      "reasoning_effort": "high",
+      "verbosity": "medium",
+      "context_window": 272000,
+      "max_output_tokens": 128000
+    }
+  },
   {
     "id": "gpt-5.2-codex-plus-pro-medium",
     "handle": "chatgpt-plus-pro/gpt-5.2-codex",