revert(onboarding): restore OpenAI GPT-5.5 as onboarding LLM default

Undo the change from #16531, which switched the first-run onboarding
LLM default from OpenAI GPT-5.5 to the OpenHands provider. Restores the
OpenAI/GPT-5.5 default constant, the localized subtitle copy, and the
unit/e2e tests to their pre-#16531 behavior.

Note: this is a fresh reverse-change rather than a git revert, since the
onboarding default constant has since drifted (#16657 changed it to
openhands/kimi-k3); the kimi-k3 mock entry is left intact.

Co-authored-by: openhands <openhands@all-hands.dev>

__tests__/components/onboarding/onboarding-modal.test.tsx

@@ -649,7 +649,7 @@ describe("OnboardingModal", () => {
     );
   });
 
-  it("pre-fills the LLM step with the OpenHands default model", () => {
+  it("pre-fills the LLM step with OpenAI GPT-5.5", () => {
     renderModal();
 
     expect(llmSettingsScreenMock).toHaveBeenCalledTimes(1);

src/components/features/onboarding/steps/setup-llm-step.tsx

@@ -16,16 +16,13 @@ interface SetupLlmStepProps {
 }
 
 /**
- * Pre-fills the LLM form with the OpenHands provider's free default model
- * (`openhands/kimi-k3`), matching `DEFAULT_SETTINGS.llm_model`. The OpenHands
- * provider is the agent the user just selected, so the onboarding override
- * keeps the LLM provider aligned with that choice rather than silently
- * switching to OpenAI. Canvas stores provider-qualified LiteLLM model ids,
- * so the override uses this OpenHands-prefixed model id, and keeping it as an
- * explicit override marks the model dirty so the Next button persists the
- * suggested default immediately.
+ * Pre-fills the LLM form with the OpenAI GPT-5.5 model. The SDK's
+ * bare default model is `gpt-5.5`; Canvas stores provider-qualified
+ * LiteLLM model ids, so the onboarding override uses this OpenAI-prefixed
+ * model id. Keeping this as an explicit override marks the model dirty so
+ * the Next button persists the suggested default immediately.
  */
-export const ONBOARDING_DEFAULT_LLM_MODEL = "openhands/kimi-k3";
+export const ONBOARDING_DEFAULT_LLM_MODEL = "openai/gpt-5.5";
 
 /**
  * Step 2: embed the LLM settings form. The screen runs in `embedded`
@@ -42,7 +39,7 @@ export const ONBOARDING_DEFAULT_LLM_MODEL = "openhands/kimi-k3";
  * Note: returning Cloud users who already have an LLM configured are
  * intercepted upstream by `OnboardingHost`, so they never reach this
  * step. Users who do reach it are first-time installs (Cloud or Local)
- * who want the OpenHands default pre-filled.
+ * who want the OpenAI/GPT-5.5 default pre-filled.
  */
 export function SetupLlmStep({ onBack, onNext }: SetupLlmStepProps) {
   const { t } = useTranslation("openhands");

src/i18n/translation.json

@@ -30787,21 +30787,21 @@
     "uk": "Налаштуйте свій LLM"
   },
   "ONBOARDING$LLM_SUBTITLE": {
-    "en": "Pick a provider and model. We've pre-selected OpenHands GLM-5.2.",
-    "ja": "プロバイダーとモデルを選択してください。OpenHands GLM-5.2 を事前に選択しています。",
-    "zh-CN": "选择提供商和模型。我们已为你预先选择 OpenHands GLM-5.2。",
-    "zh-TW": "選擇供應商與模型。我們已預先選好 OpenHands GLM-5.2。",
-    "ko-KR": "공급자와 모델을 선택하세요. 기본값으로 OpenHands GLM-5.2가 선택되어 있습니다.",
-    "no": "Velg en leverandør og modell. Vi har forhåndsvalgt OpenHands GLM-5.2.",
-    "ar": "اختر مزوّدًا ونموذجًا. لقد اخترنا مسبقًا OpenHands GLM-5.2.",
-    "de": "Wählen Sie Anbieter und Modell. Wir haben OpenHands GLM-5.2 vorausgewählt.",
-    "fr": "Choisissez un fournisseur et un modèle. Nous avons présélectionné OpenHands GLM-5.2.",
-    "it": "Scegli un provider e un modello. Abbiamo preselezionato OpenHands GLM-5.2.",
-    "pt": "Escolha um provedor e modelo. Já selecionamos o OpenHands GLM-5.2.",
-    "es": "Elige un proveedor y modelo. Hemos preseleccionado OpenHands GLM-5.2.",
-    "ca": "Trieu un proveïdor i model. Hem preseleccionat OpenHands GLM-5.2.",
-    "tr": "Bir sağlayıcı ve model seçin. OpenHands GLM-5.2'i önceden seçtik.",
-    "uk": "Виберіть провайдера та модель. OpenHands GLM-5.2 уже обрано."
+    "en": "Pick a provider and model. We've pre-selected OpenAI GPT-5.5.",
+    "ja": "プロバイダーとモデルを選択してください。OpenAI GPT-5.5 を事前に選択しています。",
+    "zh-CN": "选择提供商和模型。我们已为你预先选择 OpenAI GPT-5.5。",
+    "zh-TW": "選擇供應商與模型。我們已預先選好 OpenAI GPT-5.5。",
+    "ko-KR": "공급자와 모델을 선택하세요. 기본값으로 OpenAI GPT-5.5가 선택되어 있습니다.",
+    "no": "Velg en leverandør og modell. Vi har forhåndsvalgt OpenAI GPT-5.5.",
+    "ar": "اختر مزوّدًا ونموذجًا. لقد اخترنا مسبقًا OpenAI GPT-5.5.",
+    "de": "Wählen Sie Anbieter und Modell. Wir haben OpenAI GPT-5.5 vorausgewählt.",
+    "fr": "Choisissez un fournisseur et un modèle. Nous avons présélectionné OpenAI GPT-5.5.",
+    "it": "Scegli un provider e un modello. Abbiamo preselezionato OpenAI GPT-5.5.",
+    "pt": "Escolha um provedor e modelo. Já selecionamos o OpenAI GPT-5.5.",
+    "es": "Elige un proveedor y modelo. Hemos preseleccionado OpenAI GPT-5.5.",
+    "ca": "Trieu un proveïdor i model. Hem preseleccionat OpenAI GPT-5.5.",
+    "tr": "Bir sağlayıcı ve model seçin. OpenAI GPT-5.5'i önceden seçtik.",
+    "uk": "Виберіть провайдера та модель. OpenAI GPT-5.5 уже обрано."
   },
   "ONBOARDING$HELLO_TITLE": {
     "en": "Say hello 👋",

tests/e2e/mock-llm/onboarding/mock-llm-onboarding-regressions.spec.ts

@@ -61,10 +61,11 @@ test.describe("onboarding recent regressions", () => {
   });
 
   // Regression coverage for #1077 / PR #1089: first-run LLM setup
-  // should default users to the OpenHands provider, matching the agent
-  // selected on the previous step.
+  // should not default users to the OpenHands provider.
 
-  test("defaults the LLM setup step to OpenHands GLM-5.2", async ({ page }) => {
+  test("defaults the LLM setup step to OpenAI GPT-5.5", async ({
+    page,
+  }) => {
     await showOnboarding(page, {
       apiKey: SESSION_API_KEY,
       beforeGoto: async () => {
@@ -94,18 +95,18 @@ test.describe("onboarding recent regressions", () => {
 
     await expect(
       providerInput,
-      "first-run onboarding should default to the OpenHands provider",
-    ).toHaveValue("OpenHands", { timeout: 10_000 });
+      "first-run onboarding should default to the OpenAI provider",
+    ).toHaveValue("OpenAI", { timeout: 10_000 });
     // The model input displays the model ID without the provider prefix.
     await expect(
       modelInput,
-      "first-run onboarding should default to Kimi K3",
-    ).toHaveValue("kimi-k3", {
+      "first-run onboarding should default to GPT-5.5",
+    ).toHaveValue("gpt-5.5", {
       timeout: 10_000,
     });
     await expect(
       page.getByTestId("openhands-account-help"),
-      "OpenHands account helper should be visible for OpenHands defaults",
-    ).toBeVisible();
+      "OpenHands account helper should stay hidden for OpenAI defaults",
+    ).toHaveCount(0);
   });
 });

tests/e2e/support/onboarding-helpers.ts

@@ -21,7 +21,7 @@ export async function routeOnboardingLlmCatalog(page: Page) {
         models: {
           anthropic: ["claude-opus-4-8"],
           openai: ["gpt-5.5"],
-          openhands: ["claude-opus-4-5-20251101", "kimi-k3", "glm-5.2"],
+          openhands: ["claude-opus-4-5-20251101", "kimi-k3"],
         },
       }),
     });
@@ -37,7 +37,6 @@ export async function routeOnboardingLlmCatalog(page: Page) {
           "openai/gpt-5.5",
           "openhands/claude-opus-4-5-20251101",
           "openhands/kimi-k3",
-          "openhands/glm-5.2",
         ],
       }),
     });