diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3c9a42e0bd..b39a3b3546 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -30,6 +30,8 @@
 
 ### 🔧 Bug Fixes
 
+- **providers (onboarding wizard — unsupported validation):** adding a provider whose credentials have **no live validator** (LMArena, PiAPI, …) failed silently in the Add-Provider wizard. The `/api/providers/validate` endpoint returns `HTTP 400 + { unsupported: true }` for these (#5565/#5567), but the wizard's `validateOnboardingApiKey` ran it through `expectOk`, which threw on the non-200 — so the flow jumped to the error step and the connection was **never created**. The wizard now treats `unsupported: true` as a non-blocking "can't verify" and proceeds to save, mirroring `AddApiKeyModal`. Regression guard added to `tests/unit/provider-onboarding-wizard.test.ts`. (related to [#5692](https://github.com/diegosouzapw/OmniRoute/issues/5692))
+
 - **dashboard (Quick Start step 1):** the Quick Start "Create API key" step told users to "Go to **Endpoint** → Registered Keys" and linked to `/dashboard/endpoint`, but API keys are created on the **API Manager** page (`/dashboard/api-manager`, sidebar "API Keys") — the Endpoint page has no "Registered Keys" section, so users followed the link and could not find where to create a key. Step 1 now reads "Go to **API Keys**" and links to `/dashboard/api-manager`. Regression guard: `tests/unit/ui/quick-start-api-keys-link-5695.test.ts`. ([#5695](https://github.com/diegosouzapw/OmniRoute/issues/5695))
 
 - **providers (DashScope/Alibaba setup link):** the "Get API key" link for the **Alibaba** and **Alibaba (China)** providers pointed at the bare API host (`dashscope-intl.aliyuncs.com` / `dashscope.aliyuncs.com`), which returns **404** in a browser — API hostnames have no homepage. Repointed to the consoles where keys are actually issued: `bailian.console.alibabacloud.com` (international) and `dashscope.console.aliyun.com` (China). Same class as #5572/#5574/#5576; regression guard added to `tests/unit/provider-setup-links-5572.test.ts`. ([#5665](https://github.com/diegosouzapw/OmniRoute/issues/5665))
diff --git a/src/app/(dashboard)/dashboard/providers/components/onboarding/providerOnboardingApi.ts b/src/app/(dashboard)/dashboard/providers/components/onboarding/providerOnboardingApi.ts
index 3fe1bcf324..1882ac67ca 100644
--- a/src/app/(dashboard)/dashboard/providers/components/onboarding/providerOnboardingApi.ts
+++ b/src/app/(dashboard)/dashboard/providers/components/onboarding/providerOnboardingApi.ts
@@ -161,10 +161,18 @@ export async function validateOnboardingApiKey(
     headers: { "Content-Type": "application/json" },
     body: JSON.stringify(payload),
   });
-  const data = await expectOk<Record<string, unknown>>(
-    response,
-    "Provider credentials are not valid"
-  );
+  const data = await parseJson(response);
+  // #5565/#5567: providers with no live validator (lmarena, piapi, …) return
+  // HTTP 400 + { unsupported: true }. Treat "validation not supported" as a
+  // non-blocking "can't verify" and let the wizard proceed to save — mirror
+  // AddApiKeyModal. Without this short-circuit `expectOk` threw on the 400 and
+  // the onboarding wizard never created the connection (#5692).
+  if (data.unsupported === true) {
+    return data;
+  }
+  if (!response.ok) {
+    throw new Error(extractError(data, "Provider credentials are not valid"));
+  }
   if (data.valid === false) {
     throw new Error(extractError(data, "Provider credentials are not valid"));
   }
diff --git a/tests/unit/provider-onboarding-wizard.test.ts b/tests/unit/provider-onboarding-wizard.test.ts
index 80dc3689d7..adc78f768c 100644
--- a/tests/unit/provider-onboarding-wizard.test.ts
+++ b/tests/unit/provider-onboarding-wizard.test.ts
@@ -159,6 +159,29 @@ test("provider onboarding validation rejects HTTP 200 responses with valid false
   }
 });
 
+test("#5692 onboarding validation treats unsupported providers as non-blocking (save proceeds)", async () => {
+  const originalFetch = globalThis.fetch;
+  globalThis.fetch = async (url) => {
+    if (String(url) === "/api/providers/validate") {
+      // #5565/#5567: providers with no live validator (lmarena, piapi, …) return
+      // HTTP 400 + { unsupported: true }. The wizard must NOT treat this as a hard
+      // failure — otherwise the connection is never created (#5692).
+      return Response.json(
+        { error: "Provider validation not supported", unsupported: true },
+        { status: 400 }
+      );
+    }
+    return Response.json({ error: "unexpected" }, { status: 500 });
+  };
+
+  try {
+    const data = await api.validateOnboardingApiKey({ provider: "lmarena", apiKey: "test-key" });
+    assert.equal(data.unsupported, true);
+  } finally {
+    globalThis.fetch = originalFetch;
+  }
+});
+
 test("provider onboarding API ignores non-object error JSON", async () => {
   const originalFetch = globalThis.fetch;
   globalThis.fetch = async () => Response.json(null, { status: 500 });