diff --git a/tests/e2e/access_control/access_control_client.py b/tests/e2e/access_control/access_control_client.py
index d7bc9c280aa..2ea060145b8 100644
--- a/tests/e2e/access_control/access_control_client.py
+++ b/tests/e2e/access_control/access_control_client.py
@@ -17,6 +17,7 @@ from models import (
 
 MODEL_ACCESS_DENIED_MARKER = "key_model_access_denied"
 ROUTE_NOT_ALLOWED_MARKER = "not allowed to call this route"
+ALL_TEAM_MODELS_SENTINEL = "all-team-models"
 
 
 @dataclass(frozen=True, slots=True)
diff --git a/tests/e2e/access_control/test_access_control_e2e.py b/tests/e2e/access_control/test_access_control_e2e.py
index ce649fa2400..5ef73564561 100644
--- a/tests/e2e/access_control/test_access_control_e2e.py
+++ b/tests/e2e/access_control/test_access_control_e2e.py
@@ -19,6 +19,7 @@ import pytest
 
 from access_control_client import (
     AccessControlClient,
+    ALL_TEAM_MODELS_SENTINEL,
     MODEL_ACCESS_DENIED_MARKER,
     ROUTE_NOT_ALLOWED_MARKER,
 )
@@ -29,6 +30,7 @@ pytestmark = pytest.mark.e2e
 
 ALLOWED_MODEL = "gemini-2.5-flash"
 DISALLOWED_MODEL = "gpt-5.5"
+PROXY_CHAT_MODELS = frozenset({"gpt-5.5", "claude-haiku-4-5", "gemini-2.5-flash"})
 
 
 def _is_json(body: str) -> bool:
@@ -81,3 +83,38 @@ class TestAccessControl:
             f"{result.status_code}: {result.body[:300]}"
         )
         assert _is_json(result.body), f"400 body must be valid JSON: {result.body[:300]}"
+
+
+class TestTeamlessAllTeamModels:
+    """A key scoped to ``all-team-models`` with no team assigned inherits the
+    full proxy model list, exactly as if its models field were left empty. This
+    is the intended contract (GH #30737): #29746 tightened it to deny such keys
+    and was reverted in #32032. These cases pin both surfaces a client touches,
+    listing (GET /v1/models) and calling (/chat/completions), so re-introducing
+    the team_id guard on either path fails here."""
+
+    def test_teamless_all_team_models_key_lists_all_proxy_models(
+        self, client: AccessControlClient, resources: ResourceManager
+    ) -> None:
+        key = resources.key(models=[ALL_TEAM_MODELS_SENTINEL])
+        listed = set(client.gateway.list_models(key))
+        assert PROXY_CHAT_MODELS <= listed, (
+            f"teamless {ALL_TEAM_MODELS_SENTINEL!r} key must list every proxy model, "
+            f"missing {PROXY_CHAT_MODELS - listed}; got {sorted(listed)}"
+        )
+        assert ALL_TEAM_MODELS_SENTINEL not in listed, (
+            f"the {ALL_TEAM_MODELS_SENTINEL!r} sentinel must expand to real models, "
+            f"never surface as a listed model; got {sorted(listed)}"
+        )
+
+    def test_teamless_all_team_models_key_can_call_any_model(
+        self, client: AccessControlClient, resources: ResourceManager
+    ) -> None:
+        key = resources.key(models=[ALL_TEAM_MODELS_SENTINEL])
+        result = client.chat_status(
+            key, ALLOWED_MODEL, f"capital of France? {unique_marker()}"
+        )
+        assert result.status_code == 200, (
+            f"teamless {ALL_TEAM_MODELS_SENTINEL!r} key must be allowed to call "
+            f"{ALLOWED_MODEL!r}, got {result.status_code}: {result.body[:300]}"
+        )
diff --git a/tests/e2e/e2e_gateway.py b/tests/e2e/e2e_gateway.py
index ad8b2e833a8..dec82c04844 100644
--- a/tests/e2e/e2e_gateway.py
+++ b/tests/e2e/e2e_gateway.py
@@ -43,6 +43,7 @@ from models import (
     ModelInfoBody,
     ModelInfoEntry,
     ModelInfoResponse,
+    ModelListResponse,
     ModelMode,
     ModelNewBody,
     ModelNewResponse,
@@ -126,6 +127,21 @@ class Gateway:
             )
         ).data
 
+    def list_models(self, key: str) -> list[str]:
+        """The public model names GET /v1/models lists as callable for `key`,
+        the same visibility an OpenAI-compatible client (e.g. OpenWebUI) sees."""
+        return [
+            entry.id
+            for entry in unwrap(
+                self.transport.get(
+                    "/v1/models",
+                    headers=self.transport.bearer(key),
+                    params=NoBody(),
+                    response_type=ModelListResponse,
+                )
+            ).data
+        ]
+
     def list_files(self, key: str) -> Result[FileListResponse]:
         return self.transport.get(
             "/v1/files",
diff --git a/tests/e2e/models.py b/tests/e2e/models.py
index 39832d1a17f..f96e2e96c3c 100644
--- a/tests/e2e/models.py
+++ b/tests/e2e/models.py
@@ -389,6 +389,14 @@ class ModelInfoResponse(BaseModel):
     data: list[ModelInfoEntry] = []
 
 
+class ModelListEntry(BaseModel):
+    id: str
+
+
+class ModelListResponse(BaseModel):
+    data: list[ModelListEntry] = []
+
+
 class FileEntry(BaseModel):
     id: str
 
@@ -474,10 +482,6 @@ class ModelNewResponse(BaseModel):
     model_id: str
 
 
-class ModelListEntry(BaseModel):
-    id: str
-
-
 class ModelsListResponse(BaseModel):
     """GET /v1/models on the data plane: the deployments the gateway can actually
     serve right now. Used to confirm a freshly created model has propagated from