fix(#4536): reject openai-codex provider before empty-model early return

api/config.py

@@ -3513,6 +3513,9 @@ def _main_model_supports_service_tier(
     """Return True when the current main-model selection can use OpenAI service tier."""
     if not _is_openai_family_provider(provider):
         return False
+    resolved = str(provider or "").strip().lower()
+    if resolved == "openai-codex":
+        return False
     raw_model = str(model_id or "").strip().lower()
     if not raw_model:
         return True

static/panels.js

@@ -9693,6 +9693,7 @@ function _mainModelSupportsServiceTier(cfg){
  const optgroup=selectedOpt&&selectedOpt.parentElement&&selectedOpt.parentElement.tagName==='OPTGROUP'?selectedOpt.parentElement:null;
  const provider=((selectedOpt&&selectedOpt.dataset&&selectedOpt.dataset.provider)||(optgroup&&optgroup.dataset&&optgroup.dataset.provider)||(cfg&&cfg.provider)||'').trim().toLowerCase();
  if(provider!=='openai'&&provider!=='openai-api'&&provider!=='openai-codex') return false;
+ if(provider==='openai-codex') return false;
  const rawModel=String((selectedOpt&&selectedOpt.value)||(selected&&selected.value)||(cfg&&cfg.model)||'').trim().toLowerCase();
  if(!rawModel) return true;
  let bareModel=rawModel;

tests/test_issue4536_service_tier.py

@@ -74,6 +74,11 @@ class TestIssue4536ServiceTier:
         )
         assert codex_payload == {}
 
+        codex_empty_model_payload = config._main_model_request_overrides(
+            {"model": {"provider": "openai-codex", "service_tier": "priority"}},
+        )
+        assert codex_empty_model_payload == {}
+
         stale_openai_payload = config._main_model_request_overrides(
             {"model": {"provider": "openai", "default": "meta-llama/llama-3.1", "service_tier": "priority"}},
         )