diff --git a/ui/litellm-dashboard/src/app/globals.css b/ui/litellm-dashboard/src/app/globals.css
index 4589d0f528a..97f61a610d9 100644
--- a/ui/litellm-dashboard/src/app/globals.css
+++ b/ui/litellm-dashboard/src/app/globals.css
@@ -235,3 +235,10 @@
 .custom-border {
   border: 1px solid var(--neutral-border);
 }
+
+/* A dialog opened from inside another dialog reads as a drill-down, not a stack: base-ui stamps
+   this attribute on the parent while a child is open, so the parent steps aside instead of
+   showing its own edges around a differently sized child. */
+[data-slot="dialog-content"][data-nested-dialog-open] {
+  visibility: hidden;
+}
diff --git a/ui/litellm-dashboard/src/components/edit_auto_router/edit_auto_router_modal.test.tsx b/ui/litellm-dashboard/src/components/edit_auto_router/edit_auto_router_modal.test.tsx
index 9b36218e17a..29101b38e24 100644
--- a/ui/litellm-dashboard/src/components/edit_auto_router/edit_auto_router_modal.test.tsx
+++ b/ui/litellm-dashboard/src/components/edit_auto_router/edit_auto_router_modal.test.tsx
@@ -6,12 +6,19 @@ import { fireEvent, renderWithProviders, screen, waitFor, within } from "@/../te
 import NotificationsManager from "@/components/molecules/notifications_manager";
 import EditAutoRouterModal from "./edit_auto_router_modal";
 
-const { modelPatchUpdateCall, modelAvailableCall } = vi.hoisted(() => ({
+const { modelPatchUpdateCall, modelAvailableCall, getAutoRouterClassifierDefaultPromptCall } = vi.hoisted(() => ({
   modelPatchUpdateCall: vi.fn().mockResolvedValue({}),
   modelAvailableCall: vi.fn().mockResolvedValue({ data: [] }),
+  getAutoRouterClassifierDefaultPromptCall: vi.fn().mockResolvedValue("Classify the request into exactly one tier."),
 }));
 
-vi.mock("../networking", () => ({ modelPatchUpdateCall, modelAvailableCall }));
+vi.mock("../networking", () => ({
+  modelPatchUpdateCall,
+  modelAvailableCall,
+  getAutoRouterClassifierDefaultPromptCall,
+}));
+
+vi.mock("@/app/(dashboard)/hooks/useAuthorized", () => ({ default: () => ({ accessToken: "sk-test" }) }));
 
 vi.mock("@/components/llm_calls/fetch_models", () => ({
   fetchAvailableModels: vi.fn().mockResolvedValue([{ model_group: "gpt-4o-mini" }]),
@@ -243,6 +250,22 @@ describe("EditAutoRouterModal classifier context window", () => {
     expect(config.classifier_context_per_turn_chars).toBe(300);
   });
 
+  // The prompt editor is a base-ui Dialog at z-index 50. Housing this form in an antd Modal put a
+  // z-index 1000 overlay between the operator and it, so the editor opened underneath and could
+  // not be read or typed into. jsdom does not paint, so the assertion is the invariant behind the
+  // stacking: both overlays come from the one Dialog primitive the create form already uses.
+  it("opens the classifier prompt editor in the same overlay layer as the form", async () => {
+    const user = userEvent.setup();
+    const { baseElement } = renderLlmModal();
+
+    await user.click(await screen.findByText("Advanced: Classification Method"));
+    await user.click(await screen.findByRole("button", { name: /prompt/i }));
+
+    expect(await screen.findByLabelText("Classifier system prompt")).toBeInTheDocument();
+    expect(baseElement.querySelectorAll('[data-slot="dialog-content"]')).toHaveLength(2);
+    expect(baseElement.querySelector(".ant-modal")).toBeNull();
+  });
+
   it("persists an edited classifier context window size", async () => {
     const user = userEvent.setup();
     renderLlmModal();
diff --git a/ui/litellm-dashboard/src/components/edit_auto_router/edit_auto_router_modal.tsx b/ui/litellm-dashboard/src/components/edit_auto_router/edit_auto_router_modal.tsx
index cf1a5727948..aba0ee9f58a 100644
--- a/ui/litellm-dashboard/src/components/edit_auto_router/edit_auto_router_modal.tsx
+++ b/ui/litellm-dashboard/src/components/edit_auto_router/edit_auto_router_modal.tsx
@@ -1,6 +1,6 @@
 import React, { useEffect, useState } from "react";
-import { Modal, Form, Button, Select as AntdSelect, Tooltip } from "antd";
-import { Text, TextInput } from "@tremor/react";
+import { Form, Button, Select as AntdSelect, Tooltip } from "antd";
+import { TextInput } from "@tremor/react";
 import { modelAvailableCall, modelPatchUpdateCall } from "../networking";
 import { fetchAvailableModels, ModelGroup } from "@/components/llm_calls/fetch_models";
 import RouterConfigBuilder from "../add_model/RouterConfigBuilder";
@@ -24,6 +24,14 @@ import ComplexityRouterConfig, {
   DEFAULT_TIER_DISTANCE_PENALTY,
 } from "../add_model/ComplexityRouterConfig";
 import NotificationsManager from "../molecules/notifications_manager";
+import {
+  Dialog,
+  DialogContent,
+  DialogDescription,
+  DialogFooter,
+  DialogHeader,
+  DialogTitle,
+} from "@/components/ui/dialog";
 
 interface EditAutoRouterModalProps {
   isVisible: boolean;
@@ -432,27 +440,14 @@ const EditAutoRouterModal: React.FC<EditAutoRouterModalProps> = ({
   }));
 
   return (
-    <Modal
-      title="Edit Auto Router Configuration"
-      open={isVisible}
-      onCancel={onCancel}
-      footer={[
-        <Button key="cancel" onClick={onCancel}>
-          Cancel
-        </Button>,
-        <Tooltip key="submit" title={submitBlockedReason}>
-          <Button loading={loading} disabled={submitBlockedReason !== null} onClick={handleSubmit}>
-            Save Changes
-          </Button>
-        </Tooltip>,
-      ]}
-      width={1000}
-      destroyOnHidden
-    >
-      <div className="space-y-6">
-        <Text className="text-gray-600">
-          Edit the auto router configuration including routing logic, default models, and access settings.
-        </Text>
+    <Dialog open={isVisible} onOpenChange={(open) => !open && onCancel()}>
+      <DialogContent className="max-h-[90vh] overflow-y-auto sm:max-w-4xl">
+        <DialogHeader>
+          <DialogTitle>Edit Auto Router Configuration</DialogTitle>
+          <DialogDescription>
+            Edit the auto router configuration including routing logic, default models, and access settings.
+          </DialogDescription>
+        </DialogHeader>
 
         <Form form={form} layout="vertical" className="space-y-4">
           {/* Auto Router Name */}
@@ -552,8 +547,17 @@ const EditAutoRouterModal: React.FC<EditAutoRouterModalProps> = ({
             </Form.Item>
           )}
         </Form>
-      </div>
-    </Modal>
+
+        <DialogFooter>
+          <Button onClick={onCancel}>Cancel</Button>
+          <Tooltip title={submitBlockedReason}>
+            <Button loading={loading} disabled={submitBlockedReason !== null} onClick={handleSubmit}>
+              Save Changes
+            </Button>
+          </Tooltip>
+        </DialogFooter>
+      </DialogContent>
+    </Dialog>
   );
 };