fix(proxy): match provider-qualified group members against bare request models

litellm/proxy/hooks/model_max_budget_limiter.py

@@ -258,7 +258,13 @@ class _PROXY_VirtualKeyModelMaxBudgetLimiter(RouterBudgetLimiting):
         return tuple(
             (_group_name, _config)
             for _group_name, _config in internal_model_max_budget.items()
-            if _config.models and (model in _config.models or model_without_provider in _config.models)
+            if _config.models
+            and any(
+                _member == model
+                or _member == model_without_provider
+                or self._get_model_without_custom_llm_provider(_member) == model
+                for _member in _config.models
+            )
         )
 
     def _get_model_without_custom_llm_provider(self, model: str) -> str:

tests/test_litellm/proxy/hooks/test_model_max_budget_limiter.py

@@ -155,3 +155,22 @@ async def test_spend_at_exactly_group_budget_passes():
     await _log_spend(limiter, "anthropic-opus-4-7", 10.0, OPUS_GROUP_BUDGET)
 
     assert await limiter.is_key_within_model_budget(key, "anthropic-opus-4-8") is True
+
+
+@pytest.mark.asyncio
+async def test_group_budget_matches_bare_request_when_member_is_provider_qualified():
+    qualified_group_budget = {
+        "gpt4-family": {
+            "models": ["openai/gpt-4", "openai/gpt-4o"],
+            "budget_limit": 10.0,
+            "time_period": "30d",
+        }
+    }
+    limiter = _make_limiter()
+    key = _make_key(qualified_group_budget)
+
+    await _log_spend(limiter, "gpt-4", 11.0, qualified_group_budget)
+
+    with pytest.raises(litellm.BudgetExceededError, match="model group=gpt4-family"):
+        await limiter.is_key_within_model_budget(key, "gpt-4o")
+    assert await limiter.is_key_within_model_budget(key, "gpt-5.5") is True