diff --git a/src/codex/catalog/provider-fetch.ts b/src/codex/catalog/provider-fetch.ts
index 7ad985eef..916babd25 100644
--- a/src/codex/catalog/provider-fetch.ts
+++ b/src/codex/catalog/provider-fetch.ts
@@ -71,6 +71,32 @@ export function isProviderModelsApiItems(value: unknown): value is ProviderModel
   );
 }
 
+/**
+ * Normalize OpenAI-compatible /models payloads for catalog discovery.
+ * Supports `{ data: [...] }` and top-level arrays (Together AI `#617`).
+ * Google's `{ models: [...] }` is handled by the connectivity probe only — catalog
+ * discovery must not treat a stray `models` key on openai-chat responses as valid.
+ */
+export function providerModelsListFromResponse(json: unknown): unknown {
+  if (Array.isArray(json)) return json;
+  if (json !== null && typeof json === "object" && !Array.isArray(json)) {
+    const data = (json as { data?: unknown }).data;
+    if (Array.isArray(data)) return data;
+  }
+  return undefined;
+}
+
+/** Connectivity-probe shape: also accepts Google `{ models: [...] }`. */
+export function providerModelsListFromProbeResponse(json: unknown): unknown {
+  if (Array.isArray(json)) return json;
+  if (json !== null && typeof json === "object" && !Array.isArray(json)) {
+    const obj = json as { data?: unknown; models?: unknown };
+    if (Array.isArray(obj.data)) return obj.data;
+    if (Array.isArray(obj.models)) return obj.models;
+  }
+  return undefined;
+}
+
 export function configuredContextWindow(prov: OcxProviderConfig, id: string): number | undefined {
   const configured = modelRecordValue(prov.modelContextWindows, id) ?? prov.contextWindow;
   return typeof configured === "number" && configured > 0 ? configured : undefined;
@@ -366,9 +392,7 @@ export async function fetchProviderModels(name: string, prov: OcxProviderConfig,
       }
       return models;
     }
-    const data = json !== null && typeof json === "object" && !Array.isArray(json)
-      ? (json as { data?: unknown }).data
-      : undefined;
+    const data = providerModelsListFromResponse(json);
     if (!isProviderModelsApiItems(data)) {
       const { models, fallback, shouldLog } = failedDiscoveryFallback({ reason: "invalid_response" });
       if (shouldLog) {
diff --git a/src/server/management/provider-routes.ts b/src/server/management/provider-routes.ts
index 53d17ff10..b4aa2540d 100644
--- a/src/server/management/provider-routes.ts
+++ b/src/server/management/provider-routes.ts
@@ -2,6 +2,7 @@ import { randomUUID } from "node:crypto";
 import { readFileSync } from "node:fs";
 import type { CatalogModel } from "../../codex/catalog";
 import { catalogModelSlug, invalidateCodexModelsCache, nativeModelRows, uniqueCatalogModelsForPublicList } from "../../codex/catalog";
+import { providerModelsListFromProbeResponse } from "../../codex/catalog/provider-fetch";
 import {
   DEFAULT_SUBAGENT_MODELS,
   codexAutoStartEnabled,
@@ -339,12 +340,9 @@ export async function handleProviderRoutes(ctx: ManagementContext): Promise<Resp
       if (!res.ok) {
         return jsonResponse({ ok: false, latencyMs, error: `upstream /models returned ${res.status}` });
       }
-      const json = await res.json().catch(() => null) as { data?: unknown; models?: unknown } | null;
-      // OpenAI-style lists use { data: [...] }; Google's /v1beta/models (the other shape
-      // buildModelsRequest can produce) returns { models: [...] }.
-      const list = json && typeof json === "object" && !Array.isArray(json)
-        ? (Array.isArray(json.data) ? json.data : Array.isArray(json.models) ? json.models : undefined)
-        : undefined;
+      const json = await res.json().catch(() => null);
+      // OpenAI-style { data }, Google { models }, and Together-style top-level arrays (#617).
+      const list = providerModelsListFromProbeResponse(json);
       if (!Array.isArray(list)) {
         return jsonResponse({ ok: false, latencyMs, error: "upstream /models returned an unexpected shape" });
       }
diff --git a/tests/provider-connection-test.test.ts b/tests/provider-connection-test.test.ts
index f4bf64775..55cb7d9e4 100644
--- a/tests/provider-connection-test.test.ts
+++ b/tests/provider-connection-test.test.ts
@@ -135,6 +135,19 @@ describe("POST /api/providers/test (WP040 connectivity probe)", () => {
     expect(body.models).toBe(3);
   });
 
+  test("Together-style top-level /models array is accepted (#617)", async () => {
+    globalThis.fetch = (async () => new Response(JSON.stringify([{ id: "meta/llama" }, { id: "Qwen/Qwen" }]), {
+      status: 200,
+      headers: { "content-type": "application/json" },
+    })) as typeof fetch;
+    const config = baseConfig({
+      together: { adapter: "openai-chat", baseUrl: "https://api.together.xyz/v1", apiKey: "tg-key" },
+    });
+    const { body } = await probe(config, "together");
+    expect(body.ok).toBe(true);
+    expect(body.models).toBe(2);
+  });
+
   test("malformed 2xx data is an explicit failure, not a silent pass", async () => {
     globalThis.fetch = (async () => new Response(JSON.stringify({ nope: true }), {
       status: 200,