diff --git a/litellm/proxy/hooks/model_max_budget_limiter.py b/litellm/proxy/hooks/model_max_budget_limiter.py
index 254126c5847..9f6f7d7e95e 100644
--- a/litellm/proxy/hooks/model_max_budget_limiter.py
+++ b/litellm/proxy/hooks/model_max_budget_limiter.py
@@ -287,19 +287,30 @@ class _PROXY_VirtualKeyModelMaxBudgetLimiter(RouterBudgetLimiting):
     def _get_matching_model_group_budget_configs(
         self, model: str, internal_model_max_budget: GenericBudgetConfigType
     ) -> tuple[tuple[str, BudgetConfig], ...]:
-        model_without_provider = self._get_model_without_custom_llm_provider(model)
+        request_variants = self._model_name_variants(model)
         return tuple(
             (_group_name, _config)
             for _group_name, _config in internal_model_max_budget.items()
             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
+                _member in request_variants or model in self._model_name_variants(_member) for _member in _config.models
             )
         )
 
+    def _model_name_variants(self, model: str) -> frozenset[str]:
+        """
+        The name itself plus its provider-stripped forms: without the first
+        segment (`huggingface/meta-llama/Llama-3.1-8B` -> `meta-llama/Llama-3.1-8B`)
+        and without everything before the last slash (`openai/gpt-4` -> `gpt-4`).
+
+        Group matching compares one side's raw name against the other side's
+        variants, never stripped-vs-stripped, so a provider-prefixed member
+        still pins its group to that provider's route.
+        """
+        if "/" not in model:
+            return frozenset({model})
+        return frozenset({model, model.split("/", 1)[1], self._get_model_without_custom_llm_provider(model)})
+
     def _get_model_without_custom_llm_provider(self, model: str) -> str:
         if "/" in model:
             return model.split("/")[-1]
diff --git a/tests/test_litellm/proxy/hooks/test_model_max_budget_limiter.py b/tests/test_litellm/proxy/hooks/test_model_max_budget_limiter.py
index a7aadf1192f..d599852fb9b 100644
--- a/tests/test_litellm/proxy/hooks/test_model_max_budget_limiter.py
+++ b/tests/test_litellm/proxy/hooks/test_model_max_budget_limiter.py
@@ -253,3 +253,40 @@ async def test_end_user_group_budget_within_budget_passes():
 
     assert await limiter.is_end_user_within_model_budget(END_USER_ID, OPUS_GROUP_BUDGET, "anthropic-opus-4-7") is True
     assert await limiter.is_end_user_within_model_budget(END_USER_ID, OPUS_GROUP_BUDGET, "anthropic-opus-4-8") is True
+
+
+@pytest.mark.asyncio
+async def test_group_budget_matches_namespaced_model_with_provider_prefix():
+    namespaced_group_budget = {
+        "llama-family": {
+            "models": ["meta-llama/Llama-3.1-8B", "meta-llama/Llama-3.1-70B"],
+            "budget_limit": 10.0,
+            "time_period": "30d",
+        }
+    }
+    limiter = _make_limiter()
+    key = _make_key(namespaced_group_budget)
+
+    await _log_spend(limiter, "huggingface/meta-llama/Llama-3.1-8B", 11.0, namespaced_group_budget)
+
+    with pytest.raises(litellm.BudgetExceededError, match="model group=llama-family"):
+        await limiter.is_key_within_model_budget(key, "huggingface/meta-llama/Llama-3.1-70B")
+    with pytest.raises(litellm.BudgetExceededError, match="model group=llama-family"):
+        await limiter.is_key_within_model_budget(key, "meta-llama/Llama-3.1-8B")
+
+
+@pytest.mark.asyncio
+async def test_group_member_with_provider_prefix_does_not_match_other_provider():
+    pinned_group_budget = {
+        "openai-gpt4": {
+            "models": ["openai/gpt-4"],
+            "budget_limit": 10.0,
+            "time_period": "30d",
+        }
+    }
+    limiter = _make_limiter()
+    key = _make_key(pinned_group_budget)
+
+    await _log_spend(limiter, "gpt-4", 11.0, pinned_group_budget)
+
+    assert await limiter.is_key_within_model_budget(key, "azure/gpt-4") is True