diff --git a/packages/proxy/schema/model_list.json b/packages/proxy/schema/model_list.json
index 6bcb891a..c5d961b4 100644
--- a/packages/proxy/schema/model_list.json
+++ b/packages/proxy/schema/model_list.json
@@ -12496,7 +12496,7 @@
     ]
   },
   "openai.gpt-5.5": {
-    "format": "openai",
+    "format": "converse",
     "flavor": "chat",
     "multimodal": true,
     "input_cost_per_mil_tokens": 5.5,
@@ -12510,7 +12510,7 @@
     ]
   },
   "openai.gpt-5.4": {
-    "format": "openai",
+    "format": "converse",
     "flavor": "chat",
     "multimodal": true,
     "input_cost_per_mil_tokens": 2.75,
@@ -13149,7 +13149,7 @@
     ]
   },
   "xai.grok-4.3": {
-    "format": "openai",
+    "format": "converse",
     "flavor": "chat",
     "multimodal": true,
     "input_cost_per_mil_tokens": 1.25,