diff --git a/hermes_cli/codex_models.py b/hermes_cli/codex_models.py
index 9fe346714..43722124a 100644
--- a/hermes_cli/codex_models.py
+++ b/hermes_cli/codex_models.py
@@ -13,6 +13,7 @@ logger = logging.getLogger(__name__)
 
 DEFAULT_CODEX_MODELS: List[str] = [
     "gpt-5.3-codex",
+    "gpt-5.4",
     "gpt-5.2-codex",
     "gpt-5.1-codex-max",
     "gpt-5.1-codex-mini",
diff --git a/hermes_cli/models.py b/hermes_cli/models.py
index 3b3d0ab4d..85c248c1b 100644
--- a/hermes_cli/models.py
+++ b/hermes_cli/models.py
@@ -40,6 +40,8 @@ _PROVIDER_MODELS: dict[str, list[str]] = {
         "deepseek-v3.2",
     ],
     "openai-codex": [
+        "gpt-5.3-codex",
+        "gpt-5.4",
         "gpt-5.2-codex",
         "gpt-5.1-codex-mini",
         "gpt-5.1-codex-max",
diff --git a/hermes_cli/setup.py b/hermes_cli/setup.py
index b2e53c87d..789f2b096 100644
--- a/hermes_cli/setup.py
+++ b/hermes_cli/setup.py
@@ -654,6 +654,7 @@ def setup_model_provider(config: dict):
         _update_config_for_provider,
         _login_openai_codex,
         get_codex_auth_status,
+        resolve_codex_runtime_credentials,
         DEFAULT_CODEX_BASE_URL,
         detect_external_credentials,
     )
@@ -1266,7 +1267,14 @@ def setup_model_provider(config: dict):
         elif selected_provider == "openai-codex":
             from hermes_cli.codex_models import get_codex_model_ids
 
-            codex_models = get_codex_model_ids()
+            codex_token = None
+            try:
+                codex_creds = resolve_codex_runtime_credentials()
+                codex_token = codex_creds.get("api_key")
+            except Exception as exc:
+                logger.debug("Could not resolve Codex runtime credentials for model list: %s", exc)
+
+            codex_models = get_codex_model_ids(access_token=codex_token)
             model_choices = codex_models + [f"Keep current ({current_model})"]
             default_codex = 0
             if current_model in codex_models:
diff --git a/tests/hermes_cli/test_setup.py b/tests/hermes_cli/test_setup.py
index 54a82e4b5..7e2443abb 100644
--- a/tests/hermes_cli/test_setup.py
+++ b/tests/hermes_cli/test_setup.py
@@ -95,3 +95,50 @@ def test_custom_setup_clears_active_oauth_provider(tmp_path, monkeypatch):
     assert reloaded["model"]["provider"] == "custom"
     assert reloaded["model"]["base_url"] == "https://custom.example/v1"
     assert reloaded["model"]["default"] == "custom/model"
+
+
+def test_codex_setup_uses_runtime_access_token_for_live_model_list(tmp_path, monkeypatch):
+    monkeypatch.setenv("HERMES_HOME", str(tmp_path))
+    monkeypatch.setenv("OPENROUTER_API_KEY", "or-test-key")
+    _clear_provider_env(monkeypatch)
+    monkeypatch.setenv("OPENROUTER_API_KEY", "or-test-key")
+
+    config = load_config()
+
+    prompt_choices = iter([1, 0])
+    monkeypatch.setattr(
+        "hermes_cli.setup.prompt_choice",
+        lambda *args, **kwargs: next(prompt_choices),
+    )
+    monkeypatch.setattr("hermes_cli.setup.prompt", lambda *args, **kwargs: "")
+    monkeypatch.setattr("hermes_cli.auth.detect_external_credentials", lambda: [])
+    monkeypatch.setattr("hermes_cli.auth._login_openai_codex", lambda *args, **kwargs: None)
+    monkeypatch.setattr(
+        "hermes_cli.auth.resolve_codex_runtime_credentials",
+        lambda *args, **kwargs: {
+            "base_url": "https://chatgpt.com/backend-api/codex",
+            "api_key": "codex-access-token",
+        },
+    )
+
+    captured = {}
+
+    def _fake_get_codex_model_ids(access_token=None):
+        captured["access_token"] = access_token
+        return ["gpt-5.4", "gpt-5.3-codex"]
+
+    monkeypatch.setattr(
+        "hermes_cli.codex_models.get_codex_model_ids",
+        _fake_get_codex_model_ids,
+    )
+
+    setup_model_provider(config)
+    save_config(config)
+
+    reloaded = load_config()
+
+    assert captured["access_token"] == "codex-access-token"
+    assert isinstance(reloaded["model"], dict)
+    assert reloaded["model"]["provider"] == "openai-codex"
+    assert reloaded["model"]["default"] == "gpt-5.4"
+    assert reloaded["model"]["base_url"] == "https://chatgpt.com/backend-api/codex"