diff --git a/api/config.py b/api/config.py
index 8057b32bf..bf9e11aae 100644
--- a/api/config.py
+++ b/api/config.py
@@ -1349,7 +1349,17 @@ def resolve_model_provider(model_id: str) -> tuple:
             entry_model = (entry.get("model") or "").strip()
             entry_name = (entry.get("name") or "").strip()
             entry_base_url = (entry.get("base_url") or "").strip()
-            if entry_model and entry_name and model_id == entry_model:
+            entry_model_ids = set()
+            if entry_model:
+                entry_model_ids.add(entry_model)
+            entry_models = entry.get("models")
+            if isinstance(entry_models, dict):
+                entry_model_ids.update(
+                    key.strip()
+                    for key in entry_models.keys()
+                    if isinstance(key, str) and key.strip()
+                )
+            if entry_name and model_id in entry_model_ids:
                 provider_hint = "custom:" + entry_name.lower().replace(" ", "-")
                 return model_id, provider_hint, entry_base_url or None
 
diff --git a/tests/test_model_resolver.py b/tests/test_model_resolver.py
index a492936fd..410e77f68 100644
--- a/tests/test_model_resolver.py
+++ b/tests/test_model_resolver.py
@@ -159,6 +159,26 @@ def test_custom_provider_model_with_slash_routes_to_named_custom_provider():
     assert base_url == 'http://lmstudio.local:1234/v1'
 
 
+def test_custom_provider_models_dict_routes_to_named_custom_provider():
+    """Models listed only under custom_providers[].models still route to that endpoint."""
+    model, provider, base_url = _resolve_with_config(
+        'sensenova-6.7-flash-lite',
+        provider='xiaomi',
+        custom_providers=[{
+            'name': 'LiteLLM Proxy',
+            'base_url': 'http://127.0.0.1:8080/v1',
+            'model': 'deepseek-v4-flash',
+            'models': {
+                'deepseek-v4-flash': {},
+                'sensenova-6.7-flash-lite': {},
+            },
+        }],
+    )
+    assert model == 'sensenova-6.7-flash-lite'
+    assert provider == 'custom:litellm-proxy'
+    assert base_url == 'http://127.0.0.1:8080/v1'
+
+
 # ── get_available_models() @provider: hint behaviour ──────────────────────