diff --git a/enterprise/litellm_enterprise/proxy/management_endpoints/project_endpoints.py b/enterprise/litellm_enterprise/proxy/management_endpoints/project_endpoints.py
index 579f203554e..5ec482c385a 100644
--- a/enterprise/litellm_enterprise/proxy/management_endpoints/project_endpoints.py
+++ b/enterprise/litellm_enterprise/proxy/management_endpoints/project_endpoints.py
@@ -12,7 +12,7 @@ Endpoints for /project operations
 
 import json
 from collections.abc import Sequence
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, Final
 
 from fastapi import APIRouter, Depends, HTTPException, Request
 
@@ -35,6 +35,8 @@ if TYPE_CHECKING:
         LiteLLM_VerificationTokenActions,
     )
 
+    from litellm import Router
+
 router = APIRouter()
 
 
@@ -205,6 +207,114 @@ def _check_team_project_limits(
         )
 
 
+def _project_models_missing_positive_quota(
+    models: list[str] | None,
+    rpm_limits: Mapping[str, object] | None,
+    tpm_limits: Mapping[str, object] | None,
+) -> list[str]:
+    """Return the models that lack a positive `rpm` AND `tpm` quota.
+
+    A valid quota is a positive integer; null, zero, and negative are rejected
+    because downstream rate limiters treat a non-positive limit as immediately
+    exhausted (every request blocked).
+    """
+
+    def _is_positive(value: object) -> bool:
+        return isinstance(value, int) and not isinstance(value, bool) and value > 0
+
+    rpm = rpm_limits or {}
+    tpm = tpm_limits or {}
+    return [model for model in (models or []) if not _is_positive(rpm.get(model)) or not _is_positive(tpm.get(model))]
+
+
+def _router_access_group_names(llm_router: "Router | None") -> frozenset[str]:
+    return frozenset(llm_router.get_model_access_groups()) if llm_router is not None else frozenset()
+
+
+def _project_models_expanding_at_request_time(
+    models: Sequence[str] | None, access_group_names: frozenset[str]
+) -> tuple[str, ...]:
+    """Entries project auth expands to many concrete models (`all-proxy-models`, `*` patterns,
+    access groups). The rate limiter looks quotas up by the exact requested model name, so a
+    quota keyed on one of these entries is never applied."""
+    return tuple(
+        model
+        for model in (models or ())
+        if model == SpecialModelNames.all_proxy_models.value or "*" in model or model in access_group_names
+    )
+
+
+def _raise_on_project_models_expanding_at_request_time(
+    models: Sequence[str] | None, access_group_names: frozenset[str]
+) -> None:
+    expanding: Final = _project_models_expanding_at_request_time(models, access_group_names)
+    if not expanding:
+        return
+    raise HTTPException(
+        status_code=400,
+        detail={
+            "error": f"models {list(expanding)} expand to multiple models at request time, so a per-model rpm/tpm quota cannot be enforced for them while 'enforce_project_model_quota' is enabled. List concrete model names instead."
+        },
+    )
+
+
+def _raise_on_missing_project_model_quota(
+    data: NewProjectRequest | UpdateProjectRequest, access_group_names: frozenset[str] = frozenset()
+) -> None:
+    """Require a positive `rpm`/`tpm` quota for every model on project CREATE.
+
+    `model_rpm_limit`/`model_tpm_limit` are relocated into `metadata` by the request
+    model's `set_model_info` validator, so they are read from there.
+
+    Only invoked when `general_settings.enforce_project_model_quota` is enabled
+    (default off), so it is opt-in and does not change behavior for existing users.
+    """
+    _raise_on_project_models_expanding_at_request_time(data.models, access_group_names)
+    metadata = data.metadata or {}
+    missing = _project_models_missing_positive_quota(
+        data.models, metadata.get("model_rpm_limit"), metadata.get("model_tpm_limit")
+    )
+    if not missing:
+        return
+    raise HTTPException(
+        status_code=400,
+        detail={
+            "error": f"models {missing} added to project without a positive rpm/tpm quota. Set a positive model_rpm_limit and model_tpm_limit for each model."
+        },
+    )
+
+
+def _raise_on_missing_project_model_quota_on_update(
+    data: UpdateProjectRequest, existing_project: object, access_group_names: frozenset[str] = frozenset()
+) -> None:
+    """Require a positive `rpm`/`tpm` quota over the RESULTING state on project UPDATE.
+
+    `/project/update` replaces `models` and `metadata` when they are provided, so the
+    check runs on what the project WILL look like: a partial update that doesn't touch
+    models/quota keeps the existing values, while one that adds a model or clears a
+    model's quota must leave every resulting model with a positive limit.
+
+    Only invoked when `general_settings.enforce_project_model_quota` is enabled
+    (default off), so it is opt-in and does not change behavior for existing users.
+    """
+    resulting_models = data.models if data.models is not None else (getattr(existing_project, "models", None) or [])
+    resulting_metadata = (
+        data.metadata if data.metadata is not None else (getattr(existing_project, "metadata", None) or {})
+    )
+    _raise_on_project_models_expanding_at_request_time(resulting_models, access_group_names)
+    missing = _project_models_missing_positive_quota(
+        resulting_models, resulting_metadata.get("model_rpm_limit"), resulting_metadata.get("model_tpm_limit")
+    )
+    if not missing:
+        return
+    raise HTTPException(
+        status_code=400,
+        detail={
+            "error": f"models {missing} would be left on the project without a positive rpm/tpm quota. Set a positive model_rpm_limit and model_tpm_limit for each model."
+        },
+    )
+
+
 async def _create_budget_for_project(
     data: NewProjectRequest,
     user_id: str | None,
@@ -352,7 +462,9 @@ async def new_project(
     ```
     """
     from litellm.proxy.proxy_server import (
+        general_settings,
         litellm_proxy_admin_name,
+        llm_router,
         premium_user,
         prisma_client,
     )
@@ -399,6 +511,10 @@ async def new_project(
             data=data,
         )
 
+        # Opt-in (default off): require rpm/tpm for every model added to the project.
+        if general_settings.get("enforce_project_model_quota", False):
+            _raise_on_missing_project_model_quota(data, _router_access_group_names(llm_router))
+
         # Check if user has permission to create projects for this team
         # only team admins can create projects for their team
         has_permission = await _check_user_permission_for_project(
@@ -538,7 +654,9 @@ async def update_project(
     ```
     """
     from litellm.proxy.proxy_server import (
+        general_settings,
         litellm_proxy_admin_name,
+        llm_router,
         premium_user,
         prisma_client,
         user_api_key_cache,
@@ -642,6 +760,12 @@ async def update_project(
                 data=data,
             )
 
+        # Opt-in (default off): require rpm/tpm for every model the update would leave on the project.
+        if general_settings.get("enforce_project_model_quota", False):
+            _raise_on_missing_project_model_quota_on_update(
+                data, existing_project, _router_access_group_names(llm_router)
+            )
+
         # Prepare update data
         update_data = _jsonified(prisma_client, data.model_dump(exclude_none=True, exclude={"project_id"}))
         update_data["updated_by"] = user_api_key_dict.user_id or litellm_proxy_admin_name
diff --git a/tests/enterprise/litellm_enterprise/proxy/management_endpoints/test_project_endpoints_prisma.py b/tests/enterprise/litellm_enterprise/proxy/management_endpoints/test_project_endpoints_prisma.py
index 34a0d1c9f7a..c23b203feba 100644
--- a/tests/enterprise/litellm_enterprise/proxy/management_endpoints/test_project_endpoints_prisma.py
+++ b/tests/enterprise/litellm_enterprise/proxy/management_endpoints/test_project_endpoints_prisma.py
@@ -4,7 +4,7 @@ from litellm._uuid import uuid
 from unittest import mock
 
 from dotenv import load_dotenv
-from fastapi import Request
+from fastapi import HTTPException, Request
 
 load_dotenv()
 import time
@@ -40,6 +40,7 @@ from litellm.proxy._types import (
     DeleteProjectRequest,
     NewTeamRequest,
     UserAPIKeyAuth,
+    ProxyException,
 )
 
 proxy_logging_obj = ProxyLogging(user_api_key_cache=DualCache())
@@ -1040,6 +1041,190 @@ async def test_project_eviction_publishes_cross_worker_invalidation(monkeypatch)
     mock_publish.assert_awaited_once_with(cache_key=f"project_id:{project_id}")
 
 
+def test_enforce_project_model_quota_missing_both_raises():
+    """A model added to a project without rpm/tpm is rejected."""
+    from litellm_enterprise.proxy.management_endpoints.project_endpoints import (
+        _raise_on_missing_project_model_quota,
+    )
+
+    data = NewProjectRequest(team_id="test-team", models=["gpt-5.5"])
+    with pytest.raises(HTTPException) as exc_info:
+        _raise_on_missing_project_model_quota(data)
+    assert "gpt-5.5" in str(exc_info.value.detail)
+    assert "rpm/tpm quota" in str(exc_info.value.detail)
+
+
+def test_enforce_project_model_quota_missing_tpm_raises():
+    """A model with rpm but no tpm is rejected."""
+    from litellm_enterprise.proxy.management_endpoints.project_endpoints import (
+        _raise_on_missing_project_model_quota,
+    )
+
+    data = NewProjectRequest(
+        team_id="test-team",
+        models=["gpt-5.5"],
+        model_rpm_limit={"gpt-5.5": 100},
+    )
+    with pytest.raises(HTTPException):
+        _raise_on_missing_project_model_quota(data)
+
+
+def test_enforce_project_model_quota_all_present_passes():
+    """A model with both rpm and tpm set passes."""
+    from litellm_enterprise.proxy.management_endpoints.project_endpoints import (
+        _raise_on_missing_project_model_quota,
+    )
+
+    data = NewProjectRequest(
+        team_id="test-team",
+        models=["gpt-5.5"],
+        model_rpm_limit={"gpt-5.5": 100},
+        model_tpm_limit={"gpt-5.5": 1000},
+    )
+    assert _raise_on_missing_project_model_quota(data) is None
+
+
+def test_enforce_project_model_quota_no_models_passes():
+    """A project with no models has nothing to enforce."""
+    from litellm_enterprise.proxy.management_endpoints.project_endpoints import (
+        _raise_on_missing_project_model_quota,
+    )
+
+    data = NewProjectRequest(team_id="test-team")
+    assert _raise_on_missing_project_model_quota(data) is None
+
+
+def test_enforce_project_model_quota_zero_rejected():
+    """A zero quota is non-positive -> rejected (downstream treats it as exhausted)."""
+    from litellm_enterprise.proxy.management_endpoints.project_endpoints import (
+        _raise_on_missing_project_model_quota,
+    )
+
+    data = NewProjectRequest(
+        team_id="test-team",
+        models=["gpt-5.5"],
+        model_rpm_limit={"gpt-5.5": 0},
+        model_tpm_limit={"gpt-5.5": 1000},
+    )
+    with pytest.raises(HTTPException):
+        _raise_on_missing_project_model_quota(data)
+
+
+def test_enforce_project_model_quota_negative_rejected():
+    """A negative quota is non-positive -> rejected."""
+    from litellm_enterprise.proxy.management_endpoints.project_endpoints import (
+        _raise_on_missing_project_model_quota,
+    )
+
+    data = NewProjectRequest(
+        team_id="test-team",
+        models=["gpt-5.5"],
+        model_rpm_limit={"gpt-5.5": 100},
+        model_tpm_limit={"gpt-5.5": -1},
+    )
+    with pytest.raises(HTTPException):
+        _raise_on_missing_project_model_quota(data)
+
+
+def test_update_quota_adds_model_without_quota_rejected():
+    """Adding a model via /project/update without quota is rejected (the bypass)."""
+    import types
+
+    from litellm.proxy._types import UpdateProjectRequest
+    from litellm_enterprise.proxy.management_endpoints.project_endpoints import (
+        _raise_on_missing_project_model_quota_on_update,
+    )
+
+    existing = types.SimpleNamespace(models=[], metadata={})
+    data = UpdateProjectRequest(project_id="p", models=["gpt-5.5"])  # adds model, no quota
+    with pytest.raises(HTTPException):
+        _raise_on_missing_project_model_quota_on_update(data, existing)
+
+
+def test_update_quota_adds_model_with_quota_passes():
+    """Adding a model with a positive quota via update passes."""
+    import types
+
+    from litellm.proxy._types import UpdateProjectRequest
+    from litellm_enterprise.proxy.management_endpoints.project_endpoints import (
+        _raise_on_missing_project_model_quota_on_update,
+    )
+
+    existing = types.SimpleNamespace(models=[], metadata={})
+    data = UpdateProjectRequest(
+        project_id="p",
+        models=["gpt-5.5"],
+        model_rpm_limit={"gpt-5.5": 100},
+        model_tpm_limit={"gpt-5.5": 1000},
+    )
+    assert _raise_on_missing_project_model_quota_on_update(data, existing) is None
+
+
+def test_update_quota_partial_update_keeps_existing_valid_passes():
+    """A partial update that doesn't touch models/quota keeps existing valid quota -> passes."""
+    import types
+
+    from litellm.proxy._types import UpdateProjectRequest
+    from litellm_enterprise.proxy.management_endpoints.project_endpoints import (
+        _raise_on_missing_project_model_quota_on_update,
+    )
+
+    existing = types.SimpleNamespace(
+        models=["gpt-5.5"],
+        metadata={"model_rpm_limit": {"gpt-5.5": 100}, "model_tpm_limit": {"gpt-5.5": 1000}},
+    )
+    data = UpdateProjectRequest(project_id="p", description="unrelated change")
+    assert _raise_on_missing_project_model_quota_on_update(data, existing) is None
+
+
+def test_update_quota_existing_quotaless_model_rejected():
+    """A project already holding a quota-less model is rejected on any update (fail-closed)."""
+    import types
+
+    from litellm.proxy._types import UpdateProjectRequest
+    from litellm_enterprise.proxy.management_endpoints.project_endpoints import (
+        _raise_on_missing_project_model_quota_on_update,
+    )
+
+    existing = types.SimpleNamespace(models=["gpt-5.5"], metadata={})
+    data = UpdateProjectRequest(project_id="p", description="unrelated change")
+    with pytest.raises(HTTPException):
+        _raise_on_missing_project_model_quota_on_update(data, existing)
+
+
+def _enforced_new_project_mocks(monkeypatch, team_models: list[str], llm_router: mock.MagicMock | None) -> None:
+    from litellm.proxy._types import LiteLLM_TeamTable
+    from litellm_enterprise.proxy.management_endpoints import project_endpoints as pe
+
+    team = LiteLLM_TeamTable(team_id="test-team", models=team_models)
+    monkeypatch.setattr(litellm.proxy.proxy_server, "prisma_client", mock.MagicMock())
+    monkeypatch.setattr(litellm.proxy.proxy_server, "premium_user", True)
+    monkeypatch.setattr(litellm.proxy.proxy_server, "llm_router", llm_router)
+    monkeypatch.setattr(litellm.proxy.proxy_server, "general_settings", {"enforce_project_model_quota": True})
+    monkeypatch.setattr(pe, "_validate_team_exists", mock.AsyncMock(return_value=team))
+    monkeypatch.setattr(pe, "_check_user_permission_for_project", mock.AsyncMock(return_value=True))
+
+
+async def _run_new_project(data: NewProjectRequest) -> None:
+    await new_project(
+        data=data,
+        http_request=Request(scope={"type": "http"}),
+        user_api_key_dict=UserAPIKeyAuth(user_role=LitellmUserRoles.PROXY_ADMIN, api_key="sk-1234", user_id="1234"),
+    )
+
+
+@pytest.mark.asyncio
+async def test_new_project_flag_on_missing_rpm_tpm_returns_400(monkeypatch):
+    """End-to-end: with the flag on, POST /project/new rejects a model added without rpm/tpm."""
+    _enforced_new_project_mocks(monkeypatch, team_models=["gpt-5.5"], llm_router=None)
+
+    with pytest.raises(ProxyException, match="rpm/tpm quota") as exc_info:
+        await _run_new_project(NewProjectRequest(team_id="test-team", models=["gpt-5.5"]))
+
+    # new_project re-wraps the HTTPException, so assert on the string form.
+    assert "rpm/tpm quota" in str(exc_info.value)
+
+
 def _project_update_mocks(monkeypatch, stored_metadata: dict) -> mock.MagicMock:
     existing_row = mock.MagicMock(
         team_id=None, budget_id=None, object_permission_id=None, metadata=stored_metadata
@@ -1105,3 +1290,81 @@ async def test_update_project_leaves_metadata_untouched_when_no_limit_is_sent(mo
     await _run_project_update(project_id, description="renamed only")
 
     assert "metadata" not in _written_project_data(mock_prisma)
+
+
+@pytest.mark.parametrize("entry", ["all-proxy-models", "*", "azure/*"])
+def test_enforce_project_model_quota_rejects_entries_that_expand_at_request_time(entry):
+    """A quota keyed on a wildcard entry is never applied by the limiter, so it fails loudly."""
+    from litellm_enterprise.proxy.management_endpoints.project_endpoints import (
+        _raise_on_missing_project_model_quota,
+    )
+
+    data = NewProjectRequest(
+        team_id="test-team",
+        models=[entry],
+        model_rpm_limit={entry: 10},
+        model_tpm_limit={entry: 1000},
+    )
+    with pytest.raises(HTTPException) as exc_info:
+        _raise_on_missing_project_model_quota(data)
+    assert exc_info.value.status_code == 400
+    assert entry in str(exc_info.value.detail)
+    assert "expand to multiple models at request time" in str(exc_info.value.detail)
+
+
+def test_enforce_project_model_quota_rejects_access_group_only_when_router_defines_it():
+    """A plain model name passes; the same name is rejected once the router reports it as an access group."""
+    from litellm_enterprise.proxy.management_endpoints.project_endpoints import (
+        _raise_on_missing_project_model_quota,
+    )
+
+    data = NewProjectRequest(
+        team_id="test-team",
+        models=["prod-models"],
+        model_rpm_limit={"prod-models": 10},
+        model_tpm_limit={"prod-models": 1000},
+    )
+    assert _raise_on_missing_project_model_quota(data, access_group_names=frozenset()) is None
+    with pytest.raises(HTTPException) as exc_info:
+        _raise_on_missing_project_model_quota(data, access_group_names=frozenset({"prod-models"}))
+    assert "prod-models" in str(exc_info.value.detail)
+    assert "expand to multiple models at request time" in str(exc_info.value.detail)
+
+
+def test_update_quota_rejects_wildcard_left_on_project():
+    """An update that leaves a wildcard entry on the project is rejected even when it carries a quota."""
+    import types
+
+    from litellm_enterprise.proxy.management_endpoints.project_endpoints import (
+        _raise_on_missing_project_model_quota_on_update,
+    )
+
+    existing = types.SimpleNamespace(
+        models=["all-proxy-models"],
+        metadata={"model_rpm_limit": {"all-proxy-models": 10}, "model_tpm_limit": {"all-proxy-models": 1000}},
+    )
+    data = UpdateProjectRequest(project_id="p", description="unrelated change")
+    with pytest.raises(HTTPException) as exc_info:
+        _raise_on_missing_project_model_quota_on_update(data, existing)
+    assert "all-proxy-models" in str(exc_info.value.detail)
+    assert "expand to multiple models at request time" in str(exc_info.value.detail)
+
+
+@pytest.mark.asyncio
+async def test_new_project_flag_on_access_group_model_returns_400(monkeypatch):
+    """End-to-end: the router's access groups reach the check, so an access-group entry is rejected."""
+    llm_router = mock.MagicMock()
+    llm_router.get_model_access_groups.return_value = {"prod-models": ["gpt-5.5"]}
+    _enforced_new_project_mocks(monkeypatch, team_models=["prod-models"], llm_router=llm_router)
+    data = NewProjectRequest(
+        team_id="test-team",
+        models=["prod-models"],
+        model_rpm_limit={"prod-models": 10},
+        model_tpm_limit={"prod-models": 1000},
+    )
+
+    with pytest.raises(ProxyException, match="expand to multiple models at request time") as exc_info:
+        await _run_new_project(data)
+
+    assert "prod-models" in str(exc_info.value)
+    assert "expand to multiple models at request time" in str(exc_info.value)