diff --git a/litellm/proxy/public_endpoints/provider_create_fields.json b/litellm/proxy/public_endpoints/provider_create_fields.json
index cd781abee26..4ea3ace8f03 100644
--- a/litellm/proxy/public_endpoints/provider_create_fields.json
+++ b/litellm/proxy/public_endpoints/provider_create_fields.json
@@ -3421,6 +3421,34 @@
     ],
     "default_model_placeholder": "gpt-3.5-turbo"
   },
+  {
+    "provider": "ZAI",
+    "provider_display_name": "Z.AI (Zhipu AI)",
+    "litellm_provider": "zai",
+    "credential_fields": [
+      {
+        "key": "api_base",
+        "label": "API Base",
+        "placeholder": "https://api.z.ai/api/paas/v4",
+        "tooltip": null,
+        "required": false,
+        "field_type": "text",
+        "options": null,
+        "default_value": null
+      },
+      {
+        "key": "api_key",
+        "label": "API Key",
+        "placeholder": null,
+        "tooltip": null,
+        "required": true,
+        "field_type": "password",
+        "options": null,
+        "default_value": null
+      }
+    ],
+    "default_model_placeholder": "zai/glm-4.5"
+  },
   {
     "provider": "CURSOR",
     "provider_display_name": "Cursor",
diff --git a/tests/test_litellm/proxy/public_endpoints/test_public_endpoints.py b/tests/test_litellm/proxy/public_endpoints/test_public_endpoints.py
index 0d82ed778f5..89fc1fd12a1 100644
--- a/tests/test_litellm/proxy/public_endpoints/test_public_endpoints.py
+++ b/tests/test_litellm/proxy/public_endpoints/test_public_endpoints.py
@@ -328,6 +328,37 @@ def test_cognition_provider_fields():
     assert fields_by_key["api_base"]["required"] is False
 
 
+def test_zai_provider_fields():
+    """Z.AI must be selectable in the Add Credential flow (#39310).
+
+    The form is driven by GET /public/providers/fields. Without a ZAI row the
+    UI shows only Credential Name and Provider, so the key cannot be saved.
+    """
+    app_instance = FastAPI()
+    app_instance.include_router(router)
+    test_client = TestClient(app_instance)
+
+    response = test_client.get("/public/providers/fields")
+    assert response.status_code == 200
+    providers = response.json()
+
+    zai = next((p for p in providers if p["provider"] == "ZAI"), None)
+    assert zai is not None, "Z.AI provider entry not found"
+
+    assert zai["provider_display_name"] == "Z.AI (Zhipu AI)"
+    assert zai["litellm_provider"] == "zai"
+    assert zai["default_model_placeholder"].startswith("zai/")
+
+    fields_by_key = {f["key"]: f for f in zai["credential_fields"]}
+
+    assert fields_by_key["api_key"]["required"] is True
+    assert fields_by_key["api_key"]["field_type"] == "password"
+
+    assert fields_by_key["api_base"]["required"] is False
+    assert fields_by_key["api_base"]["field_type"] == "text"
+    assert fields_by_key["api_base"]["placeholder"] == "https://api.z.ai/api/paas/v4"
+
+
 def test_chatgpt_provider_fields():
     app_instance = FastAPI()
     app_instance.include_router(router)
@@ -386,7 +417,6 @@ ADD_MODEL_UNLISTED_PROVIDERS: Final = frozenset(
         "text-completion-inception",
         "valkey",
         "xiaomi_mimo",
-        "zai",
     }
 )