diff --git a/packages/proxy/schema/model_list.json b/packages/proxy/schema/model_list.json
index d2b4c02c..e70882c6 100644
--- a/packages/proxy/schema/model_list.json
+++ b/packages/proxy/schema/model_list.json
@@ -2309,7 +2309,7 @@
     "max_output_tokens": 128000
   },
   "claude-opus-4-6-20260205": {
-    "format": "openai",
+    "format": "anthropic",
     "flavor": "chat",
     "multimodal": true,
     "input_cost_per_mil_tokens": 5,
@@ -2383,7 +2383,7 @@
     "max_output_tokens": 64000
   },
   "claude-opus-4-1": {
-    "format": "openai",
+    "format": "anthropic",
     "flavor": "chat",
     "multimodal": true,
     "input_cost_per_mil_tokens": 15,