diff --git a/apps/admin/src/routes/providers/[accountId]/+page.svelte b/apps/admin/src/routes/providers/[accountId]/+page.svelte
index 85da465a..41182c7a 100644
--- a/apps/admin/src/routes/providers/[accountId]/+page.svelte
+++ b/apps/admin/src/routes/providers/[accountId]/+page.svelte
@@ -1,4 +1,5 @@
 <script lang="ts">
+  import { selectCodexAccountWeeklyQuotaWindows } from '@helm/shared';
   import { invalidateAll } from '$app/navigation';
   import { base } from '$app/paths';
   import type { OAuthQuotaWindow, OAuthUsagePeriod } from '$lib/api/oauth.js';
@@ -57,6 +58,13 @@
         keys.push(p.windowKey);
       }
     }
+    // Codex history follows the account's weekly allowance, never its 5h resets.
+    if (data.providerId === 'openai-codex') {
+      const weeklyKeys = new Set(
+        selectCodexAccountWeeklyQuotaWindows(data.quota?.windows ?? []).map((w) => w.key),
+      );
+      return keys.filter((key) => weeklyKeys.has(key));
+    }
     return keys;
   });
 
@@ -68,7 +76,7 @@
 
   let activeKey = $state<string | null>(null);
   $effect(() => {
-    if (activeKey === null && windowKeys.length > 0) {
+    if (activeKey === null || !windowKeys.includes(activeKey)) {
       activeKey = windowKeys.find(isWeeklyKey) ?? windowKeys[0] ?? null;
     }
   });
diff --git a/apps/admin/src/routes/providers/[accountId]/account-detail.test.ts b/apps/admin/src/routes/providers/[accountId]/account-detail.test.ts
index ce21e476..b8262933 100644
--- a/apps/admin/src/routes/providers/[accountId]/account-detail.test.ts
+++ b/apps/admin/src/routes/providers/[accountId]/account-detail.test.ts
@@ -1,5 +1,5 @@
 import { fireEvent, render, screen, within } from '@testing-library/svelte';
-import { beforeEach, describe, expect, it, vi } from 'vitest';
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
 import { invalidateAll } from '$app/navigation';
 import type { AccountDetailData } from './+page.js';
 import AccountDetailPage from './+page.svelte';
@@ -57,7 +57,12 @@ const data: AccountDetailData = {
 };
 
 describe('provider account detail', () => {
-  beforeEach(() => invalidateAllMock.mockReset());
+  beforeEach(() => {
+    invalidateAllMock.mockReset();
+    vi.spyOn(Date, 'now').mockReturnValue(Date.UTC(2026, 7, 18, 14, 0));
+  });
+
+  afterEach(() => vi.restoreAllMocks());
 
   it('hides the window switcher when the account has a single reset window', () => {
     render(AccountDetailPage, { data });
@@ -67,12 +72,70 @@ describe('provider account detail', () => {
   it('shows the window switcher when there are several reset windows', () => {
     const second = { ...data.periods.current[0], windowKey: 'secondary' };
     render(AccountDetailPage, {
-      data: { ...data, periods: { ...data.periods, current: [...data.periods.current, second] } },
+      data: {
+        ...data,
+        providerId: 'anthropic',
+        periods: { ...data.periods, current: [...data.periods.current, second] },
+      },
     });
     const tabs = screen.getByRole('tablist', { name: 'Reset window' });
     expect(within(tabs).getAllByRole('tab')).toHaveLength(2);
   });
 
+  it.each(['primary', 'secondary'])(
+    'shows only the weekly Codex window when it is %s',
+    async (weeklyKey) => {
+      const shortKey = weeklyKey === 'primary' ? 'secondary' : 'primary';
+      const now = Date.now();
+      const weekly = { ...data.periods.current[0], windowKey: weeklyKey };
+      const short = { ...weekly, windowKey: shortKey, tokens: 8_200_000, usedPercent: 100 };
+      render(AccountDetailPage, {
+        data: {
+          ...data,
+          periods: {
+            ...data.periods,
+            current: [short, weekly],
+            periods: [
+              { ...short, periodStartMs: short.periodStartMs - 5 * 3_600_000, tokens: 5_500_000 },
+              { ...data.periods.periods[0], windowKey: weeklyKey },
+            ],
+            daily: [{ ...weekly, windowKey: 'day', tokens: 42_000 }],
+          },
+          quota: {
+            ...data.quota!,
+            windows: [
+              {
+                key: shortKey,
+                windowMinutes: 300,
+                resetsAtMs: now + 2 * 3_600_000,
+                usedPercent: 100,
+              },
+              {
+                key: weeklyKey,
+                windowMinutes: 10_080,
+                resetsAtMs: now + 3 * 86_400_000,
+                usedPercent: 80,
+              },
+            ],
+          },
+        },
+      });
+
+      expect(screen.queryByRole('tablist', { name: 'Reset window' })).toBeNull();
+      expect(screen.getByText('resets in 3d')).toBeInTheDocument();
+      const table = screen.getByRole('table');
+      expect(within(table).getByText('383M')).toBeInTheDocument();
+      expect(within(table).getByText('80%')).toBeInTheDocument();
+      expect(within(table).getAllByRole('row')).toHaveLength(3);
+      expect(screen.queryByText('8.2M')).toBeNull();
+      expect(screen.queryByText('5.5M')).toBeNull();
+      expect(screen.queryByText('100%')).toBeNull();
+
+      await fireEvent.click(screen.getByRole('button', { name: 'Daily' }));
+      expect(within(table).getByText('42K')).toBeInTheDocument();
+    },
+  );
+
   it('includes the live current period in the period history', () => {
     render(AccountDetailPage, { data });
 
diff --git a/implementation-notes.md b/implementation-notes.md
index 5e30bd98..f8928111 100644
--- a/implementation-notes.md
+++ b/implementation-notes.md
@@ -7,6 +7,11 @@
 
 ---
 
+## 2026-09-30 · Codex 账号详情只展示周额度周期（docs/11）
+
+- **决定**：详情页复用已有的 Codex 账号周额度选择器，按实际时长识别周窗口，不再把 `primary` 固定当作周限；当前用量、历史、已用比例与倒计时统一使用周窗口，隐藏 5h 周期切换。
+- **边界**：仅调整 Codex 详情展示，保留原始周期记录、API、5h 路由限额及按日/自然周汇总。没有可识别周窗口时不以 5h 冒充周额度；其他 provider 维持原行为。
+
 ## 2026-09-30 · GPT-6.1 Sol 接入与 Sol 配置迁移（docs/04、05、07、10）
 
 - **官方依据**：[模型](https://developers.openai.com/api/docs/models/gpt-6.1-sol)、[价格](https://developers.openai.com/api/docs/pricing)、[Codex](https://developers.openai.com/codex/models)。API 上下文 1,050,000、最大输入 922,000、输出 128,000；推理 low/medium/high/xhigh/max，API 默认 medium，不支持 none/minimal。当前 catalog 没有独立输入上限字段，由上游继续校验 922K 输入限制。
@@ -76,14 +81,10 @@
 - **真实生产 box 验证发现请求详情页会报错（非回归，是预期的"字段未上线"场景）→ 已补防御**：本次给 `PortalDecisionView` 新增的 `attempts`/`tps`/`ttfb_ms`/`requested_reasoning_effort`/`reasoning_effort` 字段还没有部署到生产 box，代理到真实数据时旧响应缺这些字段（JSON.parse 后是 `undefined` 而非 `null`），`detail.attempts.length` 会触发 `Cannot read properties of undefined`。这不是代码 bug，但客户端理应对"字段未部署"宽容降级：新增 `apps/portal/src/lib/request-detail-normalize.ts`（`normalizePortalDetail`），在 `load()` 拿到响应后立即把缺失的 `attempts`→`[]`、`tps`/`ttfb_ms`/`generation_ms`→`null`，页面模板其余逻辑不用改。单测 `request-detail-normalize.test.ts` 覆盖"字段齐全原样透传"与"字段缺失时按各自类型的哨兵值归一化"两种情况；`request-detail-parity.test.ts` 新增一条固化调用点存在。原先 TODO 已解决。
 - **可视化走查已完成**：真实生产数据 Playwright 走查全部完成（12 张 + 1 张 mock 截图），Overview/Requests/Connect/Memory/Account 五个页面在两种视口下逐一审阅，无遗留视觉问题；定向 vitest 57/57、`svelte-check` 0 错误 0 警告、i18n 对齐 12/12。
 
-## 2026-09-26 · DeepSeek 兜底与 Responses 请求变更可观测性（Provider fallback，docs/04、07）
-
-- **决定**：保留 DeepSeek 对 opaque reasoning history 的 `effort: none` 降级，并让 request-contract 生成的 body mutation ledger 回写到执行器持有的 carrier。这样首选上游 429 后，DeepSeek 的候选尝试既可成功，也能在管理记录中显示实际应用的降级。
-- **验证与限制**：新增执行器回归覆盖 429 → DeepSeek fallback 成功与拒绝；保留真实 400 详情。原 trace 的历史已在现行部署做限输出回放，未复现 reasoning 400，但没有该失败尝试的完整出站正文，不能据此宣称原始拒绝已修复。此改动只修复诊断缺失。
-
-
 ## 更早历史总览
 
+2026-09-26：DeepSeek fallback 保留 opaque reasoning 降级，request-contract mutation ledger 回写执行器；未据此宣称历史上游 400 已修复。完整记录见 git history。
+
 2026-09-26：订阅重连复用 OAuth 流程及原账号代理、标签，解密和账号匹配失败时拒绝，详见 Git 历史。
 
 2026-09-25：Claude OAuth 手动重置额度，含组织/额度校验、二次确认、结果不明禁止重试与权威读回，详见 Git 历史。