diff --git a/CHANGELOG.md b/CHANGELOG.md
index cd9ccb77f4..16797e93d4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,7 @@ _In development — bullets added per PR; finalized at release._
 - **Onboarding**: add the missing `onboarding.tiers` step-title translation so the setup wizard no longer crashes with `MISSING_MESSAGE: onboarding.tiers` (#4698).
 - **deepseek-web**: fold `role:"tool"` results into the single-prompt transcript (`messagesToPrompt`) so tool outputs reach the model instead of being silently dropped when a follow-up turn omits the `tools[]` array (#4712).
 - **Dashboard**: remove the dead, unconditional `useLiveRequests()` call from `HomePageClient.tsx` — it crashed the `/home` page in production builds with `ReferenceError: useLiveRequests is not defined` (#4759, #4745) and opened the live-dashboard WebSocket even when Provider Topology was hidden (#4596). The live feed remains owned by the settings-gated `HomeProviderTopologySection`.
+- **Providers dashboard**: dedupe provider nodes by id when adding a compatible provider (`upsertProviderNodeById`) so the same provider can no longer appear twice and no-op adds don't invalidate the compatible-provider memo (#4746).
 
 ---
 
diff --git a/src/app/(dashboard)/dashboard/providers/page.tsx b/src/app/(dashboard)/dashboard/providers/page.tsx
index 8a2567af1b..e0f56500cd 100644
--- a/src/app/(dashboard)/dashboard/providers/page.tsx
+++ b/src/app/(dashboard)/dashboard/providers/page.tsx
@@ -22,6 +22,7 @@ import {
   filterConfiguredProviderEntries,
   shouldFilterProviderEntriesForDisplayMode,
   shouldShowFirstProviderHint,
+  upsertProviderNodeById,
 } from "./providerPageUtils";
 import type { ProviderEntry } from "./providerPageUtils";
 import {
@@ -1745,7 +1746,7 @@ export default function ProvidersPage() {
         mode="openai"
         onClose={() => setShowAddCompatibleModal(false)}
         onCreated={(node) => {
-          setProviderNodes((prev) => [...prev, node]);
+          setProviderNodes((prev) => upsertProviderNodeById(prev, node));
           setShowAddCompatibleModal(false);
           router.push(`/dashboard/providers/${node.id}`);
         }}
@@ -1755,7 +1756,7 @@ export default function ProvidersPage() {
         mode="anthropic"
         onClose={() => setShowAddAnthropicCompatibleModal(false)}
         onCreated={(node) => {
-          setProviderNodes((prev) => [...prev, node]);
+          setProviderNodes((prev) => upsertProviderNodeById(prev, node));
           setShowAddAnthropicCompatibleModal(false);
           router.push(`/dashboard/providers/${node.id}`);
         }}
@@ -1767,7 +1768,7 @@ export default function ProvidersPage() {
           title={addCcCompatibleLabel}
           onClose={() => setShowAddCcCompatibleModal(false)}
           onCreated={(node) => {
-            setProviderNodes((prev) => [...prev, node]);
+            setProviderNodes((prev) => upsertProviderNodeById(prev, node));
             setShowAddCcCompatibleModal(false);
             router.push(`/dashboard/providers/${node.id}`);
           }}
diff --git a/src/app/(dashboard)/dashboard/providers/providerPageUtils.ts b/src/app/(dashboard)/dashboard/providers/providerPageUtils.ts
index 32da435927..72184b1769 100644
--- a/src/app/(dashboard)/dashboard/providers/providerPageUtils.ts
+++ b/src/app/(dashboard)/dashboard/providers/providerPageUtils.ts
@@ -276,3 +276,24 @@ export function resolveDashboardProviderInfo(
 ): ResolvedProviderCatalogEntry | null {
   return resolveProviderCatalogEntry(providerId, options);
 }
+
+/**
+ * Append or replace a provider node by `id`, never appending a duplicate (#4746).
+ *
+ * The compatible-provider "add" modals previously did `setProviderNodes((prev) => [...prev, node])`,
+ * so adding the same provider twice (refresh-then-add, double-click, retry, or React StrictMode
+ * double-invocation in dev) left the same `id` in the array twice — surfacing duplicate cards and
+ * invalidating the `compatibleProviderGroups` memo on every no-op add. This upsert dedups by id:
+ *  - new id  → append a new array,
+ *  - same id, deep-equal payload → return `prev` unchanged (stable identity ⇒ memo does not re-run),
+ *  - same id, changed payload → replace in place.
+ */
+export function upsertProviderNodeById<T extends { id?: string | null }>(prev: T[], node: T): T[] {
+  if (!node || node.id == null) return [...prev, node];
+  const idx = prev.findIndex((p) => p?.id === node.id);
+  if (idx === -1) return [...prev, node];
+  if (JSON.stringify(prev[idx]) === JSON.stringify(node)) return prev;
+  const next = prev.slice();
+  next[idx] = node;
+  return next;
+}
diff --git a/tests/unit/provider-node-dedup-4746.test.ts b/tests/unit/provider-node-dedup-4746.test.ts
new file mode 100644
index 0000000000..18d8d0daee
--- /dev/null
+++ b/tests/unit/provider-node-dedup-4746.test.ts
@@ -0,0 +1,35 @@
+// #4746 — the compatible-provider "add" modals appended provider nodes with
+// `setProviderNodes((prev) => [...prev, node])`, so the same provider id could land in the
+// array more than once (refresh-then-add, double-click, retry, StrictMode double-invocation),
+// producing duplicate cards and invalidating the compatibleProviderGroups memo on no-op adds.
+// upsertProviderNodeById dedups by id and keeps array identity stable for no-op adds.
+import { test } from "node:test";
+import assert from "node:assert/strict";
+import { upsertProviderNodeById } from "../../src/app/(dashboard)/dashboard/providers/providerPageUtils.ts";
+
+test("appends a node with a new id (#4746)", () => {
+  const prev = [{ id: "a", name: "A" }];
+  const next = upsertProviderNodeById(prev, { id: "b", name: "B" });
+  assert.deepEqual(next.map((n) => n.id), ["a", "b"]);
+});
+
+test("does not append a duplicate id — same identical payload returns prev unchanged (#4746)", () => {
+  const prev = [{ id: "a", name: "A" }];
+  const next = upsertProviderNodeById(prev, { id: "a", name: "A" });
+  assert.equal(next.length, 1);
+  assert.equal(next, prev, "no-op add must keep the same array reference (memo stability)");
+});
+
+test("replaces an existing id when the payload changed (#4746)", () => {
+  const prev = [{ id: "a", name: "A" }, { id: "b", name: "B" }];
+  const next = upsertProviderNodeById(prev, { id: "a", name: "A2" });
+  assert.equal(next.length, 2);
+  assert.equal(next.find((n) => n.id === "a")?.name, "A2");
+  assert.notEqual(next, prev);
+});
+
+test("appends when id is missing/null (cannot dedup) (#4746)", () => {
+  const prev = [{ id: "a" }];
+  const next = upsertProviderNodeById(prev, { id: null } as { id: string | null });
+  assert.equal(next.length, 2);
+});