diff --git a/.github/run-eval/resolve_model_config.py b/.github/run-eval/resolve_model_config.py
index c21ecc8888..3e60695b66 100755
--- a/.github/run-eval/resolve_model_config.py
+++ b/.github/run-eval/resolve_model_config.py
@@ -127,10 +127,10 @@
         "display_name": "GPT-5.2 Codex",
         "llm_config": {"model": "litellm_proxy/gpt-5.2-codex"},
     },
-    "gpt-5-3-codex": {
-        "id": "gpt-5-3-codex",
+    "gpt-5.3-codex": {
+        "id": "gpt-5.3-codex",
         "display_name": "GPT-5.3 Codex",
-        "llm_config": {"model": "litellm_proxy/gpt-5-3-codex"},
+        "llm_config": {"model": "litellm_proxy/gpt-5.3-codex"},
     },
     "gpt-5.2-high-reasoning": {
         "id": "gpt-5.2-high-reasoning",
diff --git a/tests/github_workflows/test_resolve_model_config.py b/tests/github_workflows/test_resolve_model_config.py
index 2ed496df68..b59fa0a7b4 100644
--- a/tests/github_workflows/test_resolve_model_config.py
+++ b/tests/github_workflows/test_resolve_model_config.py
@@ -250,12 +250,12 @@ def test_gpt_oss_20b_config():
 
 
 def test_gpt_5_3_codex_config():
-    """Test that gpt-5-3-codex has correct configuration."""
-    model = MODELS["gpt-5-3-codex"]
+    """Test that gpt-5.3-codex has correct configuration."""
+    model = MODELS["gpt-5.3-codex"]
 
-    assert model["id"] == "gpt-5-3-codex"
+    assert model["id"] == "gpt-5.3-codex"
     assert model["display_name"] == "GPT-5.3 Codex"
-    assert model["llm_config"]["model"] == "litellm_proxy/gpt-5-3-codex"
+    assert model["llm_config"]["model"] == "litellm_proxy/gpt-5.3-codex"
 
 
 def test_glm_5_config():