diff --git a/src/components/usage/UsageDashboard.tsx b/src/components/usage/UsageDashboard.tsx
index 9d49fcc27c..4eb2485d4a 100644
--- a/src/components/usage/UsageDashboard.tsx
+++ b/src/components/usage/UsageDashboard.tsx
@@ -108,9 +108,18 @@ export function UsageDashboard() {
       return getUsageRangePresetLabel(range.preset, t);
     }
 
-    return `${new Date(resolvedRange.startDate * 1000).toLocaleString(locale)} - ${new Date(
-      resolvedRange.endDate * 1000,
-    ).toLocaleString(locale)}`;
+    const startStr = new Date(resolvedRange.startDate * 1000).toLocaleString(
+      locale,
+    );
+
+    if (range.liveEndTime) {
+      return `${startStr} → ${t("usage.liveEndTimeNow", "现在")}`;
+    }
+
+    const endStr = new Date(resolvedRange.endDate * 1000).toLocaleString(
+      locale,
+    );
+    return `${startStr} - ${endStr}`;
   }, [locale, range, resolvedRange.endDate, resolvedRange.startDate, t]);
 
   // 顶栏下拉的选项池：Provider 列表只跟应用/时间范围走（不受自身选中值影响），
diff --git a/src/components/usage/UsageDateRangePicker.tsx b/src/components/usage/UsageDateRangePicker.tsx
index 067e7eeb15..845795a654 100644
--- a/src/components/usage/UsageDateRangePicker.tsx
+++ b/src/components/usage/UsageDateRangePicker.tsx
@@ -7,6 +7,7 @@ import {
   ChevronRight,
 } from "lucide-react";
 import { Button } from "@/components/ui/button";
+import { Checkbox } from "@/components/ui/checkbox";
 import { Input } from "@/components/ui/input";
 import {
   Popover,
@@ -117,6 +118,9 @@ export function UsageDateRangePicker({
   );
   const [draftStart, setDraftStart] = useState(resolvedRange.startDate);
   const [draftEnd, setDraftEnd] = useState(resolvedRange.endDate);
+  const [draftLiveEnd, setDraftLiveEnd] = useState(
+    selection.preset === "custom" ? (selection.liveEndTime ?? false) : false,
+  );
   const [displayMonth, setDisplayMonth] = useState(
     () =>
       new Date(
@@ -136,6 +140,9 @@ export function UsageDateRangePicker({
     const r = resolveUsageRange(selection);
     setDraftStart(r.startDate);
     setDraftEnd(r.endDate);
+    setDraftLiveEnd(
+      selection.preset === "custom" ? (selection.liveEndTime ?? false) : false,
+    );
     setDisplayMonth(
       new Date(
         fromTs(r.startDate).getFullYear(),
@@ -147,6 +154,15 @@ export function UsageDateRangePicker({
     setError(null);
   }, [open, selection]);
 
+  // Keep draftEnd ticking when live mode is active and popover is open
+  useEffect(() => {
+    if (!open || !draftLiveEnd) return;
+    const tick = () => setDraftEnd(Math.floor(Date.now() / 1000));
+    tick();
+    const id = setInterval(tick, 1000);
+    return () => clearInterval(id);
+  }, [open, draftLiveEnd]);
+
   const calendarDays = useMemo(
     () => getCalendarDays(displayMonth),
     [displayMonth],
@@ -169,6 +185,14 @@ export function UsageDateRangePicker({
   /* Pick a date from the calendar */
   const handleDatePick = (day: Date) => {
     setError(null);
+
+    // When live end time is active, calendar only controls start date
+    if (draftLiveEnd) {
+      const nextTs = setDateKeepTime(draftStart, day);
+      setDraftStart(nextTs);
+      return;
+    }
+
     const nextTs = setDateKeepTime(
       activeField === "start" ? draftStart : draftEnd,
       day,
@@ -211,6 +235,7 @@ export function UsageDateRangePicker({
       preset: "custom",
       customStartDate: draftStart,
       customEndDate: draftEnd,
+      liveEndTime: draftLiveEnd,
     });
     setOpen(false);
   };
@@ -222,6 +247,7 @@ export function UsageDateRangePicker({
   /* ── Field card (start / end) ── */
   const renderField = (field: DraftField) => {
     const isActive = activeField === field;
+    const isEndLive = field === "end" && draftLiveEnd;
     const ts = field === "start" ? draftStart : draftEnd;
     const setTs = field === "start" ? setDraftStart : setDraftEnd;
     const label =
@@ -232,12 +258,16 @@ export function UsageDateRangePicker({
     return (
       <div
         className={cn(
-          "rounded-lg border px-3 py-2 cursor-pointer transition-all",
-          isActive
-            ? "border-primary ring-1 ring-primary/30 bg-primary/5"
-            : "border-border/50 hover:border-border",
+          "rounded-lg border px-3 py-2 transition-all",
+          isEndLive
+            ? "border-border/30 bg-muted/30 cursor-not-allowed opacity-50"
+            : isActive
+              ? "border-primary ring-1 ring-primary/30 bg-primary/5 cursor-pointer"
+              : "border-border/50 hover:border-border cursor-pointer",
         )}
-        onClick={() => setActiveField(field)}
+        onClick={() => {
+          if (!isEndLive) setActiveField(field);
+        }}
       >
         <div className="mb-1.5 text-[11px] font-medium uppercase tracking-wider text-muted-foreground">
           {label}
@@ -245,27 +275,41 @@ export function UsageDateRangePicker({
         <div className="flex items-center gap-1.5">
           <Input
             type="date"
-            className="h-7 flex-1 border-0 bg-transparent p-0 text-sm shadow-none focus-visible:ring-0"
+            className={cn(
+              "h-7 flex-1 border-0 bg-transparent p-0 text-sm shadow-none focus-visible:ring-0",
+              isEndLive && "pointer-events-none",
+            )}
             value={fmtDate(ts)}
             onChange={(e) => {
+              if (isEndLive) return;
               const next = parseDateInput(ts, e.target.value);
               setTs(next);
               const d = fromTs(next);
               setDisplayMonth(new Date(d.getFullYear(), d.getMonth(), 1));
               setError(null);
             }}
-            onFocus={() => setActiveField(field)}
+            onFocus={() => {
+              if (!isEndLive) setActiveField(field);
+            }}
+            readOnly={isEndLive}
           />
           <Input
             type="time"
             step={60}
-            className="h-7 w-[90px] flex-none border-0 bg-transparent p-0 text-sm shadow-none focus-visible:ring-0"
+            className={cn(
+              "h-7 w-[90px] flex-none border-0 bg-transparent p-0 text-sm shadow-none focus-visible:ring-0",
+              isEndLive && "pointer-events-none",
+            )}
             value={fmtTime(ts)}
             onChange={(e) => {
+              if (isEndLive) return;
               setTs(parseTimeInput(ts, e.target.value));
               setError(null);
             }}
-            onFocus={() => setActiveField(field)}
+            onFocus={() => {
+              if (!isEndLive) setActiveField(field);
+            }}
+            readOnly={isEndLive}
           />
         </div>
       </div>
@@ -318,6 +362,23 @@ export function UsageDateRangePicker({
             {renderField("start")}
             {renderField("end")}
 
+            <label className="flex items-center gap-2 cursor-pointer select-none">
+              <Checkbox
+                checked={draftLiveEnd}
+                onCheckedChange={(checked) => {
+                  const live = checked === true;
+                  setDraftLiveEnd(live);
+                  if (live) {
+                    setDraftEnd(Math.floor(Date.now() / 1000));
+                    setActiveField("start");
+                  }
+                }}
+              />
+              <span className="text-xs text-muted-foreground">
+                {t("usage.liveEndTime", "结束时间跟随当前时刻")}
+              </span>
+            </label>
+
             {error && <p className="text-xs text-destructive">{error}</p>}
 
             <div className="flex gap-2 pt-1">
diff --git a/src/i18n/locales/en.json b/src/i18n/locales/en.json
index d5457095fe..3f760c5065 100644
--- a/src/i18n/locales/en.json
+++ b/src/i18n/locales/en.json
@@ -1472,6 +1472,8 @@
     "customRangeHint": "Supports both date and time",
     "startTime": "Start Time",
     "endTime": "End Time",
+    "liveEndTime": "End time follows current time",
+    "liveEndTimeNow": "Now",
     "input": "Input",
     "output": "Output",
     "cacheWrite": "Creation",
diff --git a/src/i18n/locales/ja.json b/src/i18n/locales/ja.json
index b39eb55b28..86a5c3db3f 100644
--- a/src/i18n/locales/ja.json
+++ b/src/i18n/locales/ja.json
@@ -1472,6 +1472,8 @@
     "customRangeHint": "日付と時刻の両方に対応",
     "startTime": "開始時刻",
     "endTime": "終了時刻",
+    "liveEndTime": "終了時刻を現在時刻に追従",
+    "liveEndTimeNow": "現在",
     "input": "Input",
     "output": "Output",
     "cacheWrite": "作成",
diff --git a/src/i18n/locales/zh-TW.json b/src/i18n/locales/zh-TW.json
index b6d7335f45..887e5f5185 100644
--- a/src/i18n/locales/zh-TW.json
+++ b/src/i18n/locales/zh-TW.json
@@ -1444,6 +1444,8 @@
     "customRangeHint": "支援日期與時間",
     "startTime": "開始時間",
     "endTime": "結束時間",
+    "liveEndTime": "結束時間跟隨當前時刻",
+    "liveEndTimeNow": "現在",
     "input": "Input",
     "output": "Output",
     "cacheWrite": "建立",
diff --git a/src/i18n/locales/zh.json b/src/i18n/locales/zh.json
index ae55b2396c..b00e12df64 100644
--- a/src/i18n/locales/zh.json
+++ b/src/i18n/locales/zh.json
@@ -1472,6 +1472,8 @@
     "customRangeHint": "支持日期与时间",
     "startTime": "开始时间",
     "endTime": "结束时间",
+    "liveEndTime": "结束时间跟随当前时刻",
+    "liveEndTimeNow": "现在",
     "input": "Input",
     "output": "Output",
     "cacheWrite": "创建",
diff --git a/src/lib/query/usage.ts b/src/lib/query/usage.ts
index f0aa307447..ea95dc0cc2 100644
--- a/src/lib/query/usage.ts
+++ b/src/lib/query/usage.ts
@@ -26,6 +26,7 @@ type RequestLogsKey = {
   preset: UsageRangeSelection["preset"];
   customStartDate?: number;
   customEndDate?: number;
+  liveEndTime?: boolean;
   appType?: string;
   providerName?: string;
   model?: string;
@@ -40,6 +41,7 @@ export const usageKeys = {
     customStartDate: number | undefined,
     customEndDate: number | undefined,
     filters?: UsageScopeFilters,
+    liveEndTime?: boolean,
   ) =>
     [
       ...usageKeys.all,
@@ -47,6 +49,7 @@ export const usageKeys = {
       preset,
       customStartDate ?? 0,
       customEndDate ?? 0,
+      liveEndTime ?? false,
       filters?.appType ?? null,
       filters?.providerName ?? null,
       filters?.model ?? null,
@@ -55,7 +58,8 @@ export const usageKeys = {
     preset: UsageRangeSelection["preset"],
     customStartDate: number | undefined,
     customEndDate: number | undefined,
-    filters?: UsageScopeFilters,
+    filters?: Pick<UsageScopeFilters, "providerName" | "model">,
+    liveEndTime?: boolean,
   ) =>
     [
       ...usageKeys.all,
@@ -63,6 +67,7 @@ export const usageKeys = {
       preset,
       customStartDate ?? 0,
       customEndDate ?? 0,
+      liveEndTime ?? false,
       filters?.providerName ?? null,
       filters?.model ?? null,
     ] as const,
@@ -71,6 +76,7 @@ export const usageKeys = {
     customStartDate: number | undefined,
     customEndDate: number | undefined,
     filters?: UsageScopeFilters,
+    liveEndTime?: boolean,
   ) =>
     [
       ...usageKeys.all,
@@ -78,6 +84,7 @@ export const usageKeys = {
       preset,
       customStartDate ?? 0,
       customEndDate ?? 0,
+      liveEndTime ?? false,
       filters?.appType ?? null,
       filters?.providerName ?? null,
       filters?.model ?? null,
@@ -87,6 +94,7 @@ export const usageKeys = {
     customStartDate: number | undefined,
     customEndDate: number | undefined,
     filters?: UsageScopeFilters,
+    liveEndTime?: boolean,
   ) =>
     [
       ...usageKeys.all,
@@ -94,6 +102,7 @@ export const usageKeys = {
       preset,
       customStartDate ?? 0,
       customEndDate ?? 0,
+      liveEndTime ?? false,
       filters?.appType ?? null,
       filters?.providerName ?? null,
       filters?.model ?? null,
@@ -103,6 +112,7 @@ export const usageKeys = {
     customStartDate: number | undefined,
     customEndDate: number | undefined,
     filters?: UsageScopeFilters,
+    liveEndTime?: boolean,
   ) =>
     [
       ...usageKeys.all,
@@ -110,6 +120,7 @@ export const usageKeys = {
       preset,
       customStartDate ?? 0,
       customEndDate ?? 0,
+      liveEndTime ?? false,
       filters?.appType ?? null,
       filters?.providerName ?? null,
       filters?.model ?? null,
@@ -121,6 +132,7 @@ export const usageKeys = {
       key.preset,
       key.customStartDate ?? 0,
       key.customEndDate ?? 0,
+      key.liveEndTime ?? false,
       key.appType ?? "",
       key.providerName ?? "",
       key.model ?? "",
@@ -159,6 +171,7 @@ export function useUsageSummary(
       range.customStartDate,
       range.customEndDate,
       effective,
+      range.liveEndTime,
     ),
     queryFn: () => {
       const { startDate, endDate } = resolveUsageRange(range);
@@ -186,6 +199,7 @@ export function useUsageSummaryByApp(
       range.customStartDate,
       range.customEndDate,
       filters,
+      range.liveEndTime,
     ),
     queryFn: () => {
       const { startDate, endDate } = resolveUsageRange(range);
@@ -213,6 +227,7 @@ export function useUsageTrends(
       range.customStartDate,
       range.customEndDate,
       effective,
+      range.liveEndTime,
     ),
     queryFn: () => {
       const { startDate, endDate } = resolveUsageRange(range);
@@ -241,6 +256,7 @@ export function useProviderStats(
       range.customStartDate,
       range.customEndDate,
       effective,
+      range.liveEndTime,
     ),
     queryFn: () => {
       const { startDate, endDate } = resolveUsageRange(range);
@@ -269,6 +285,7 @@ export function useModelStats(
       range.customStartDate,
       range.customEndDate,
       effective,
+      range.liveEndTime,
     ),
     queryFn: () => {
       const { startDate, endDate } = resolveUsageRange(range);
@@ -296,6 +313,7 @@ export function useRequestLogs({
     preset: range.preset,
     customStartDate: range.customStartDate,
     customEndDate: range.customEndDate,
+    liveEndTime: range.liveEndTime,
     appType: filters.appType,
     providerName: filters.providerName,
     model: filters.model,
diff --git a/src/lib/usageRange.ts b/src/lib/usageRange.ts
index 4b70ee1d24..6cedcf3200 100644
--- a/src/lib/usageRange.ts
+++ b/src/lib/usageRange.ts
@@ -49,7 +49,9 @@ export function resolveUsageRange(
       };
     case "custom": {
       const startDate = selection.customStartDate ?? endDate - DAY_SECONDS;
-      const customEndDate = selection.customEndDate ?? endDate;
+      const customEndDate = selection.liveEndTime
+        ? endDate
+        : (selection.customEndDate ?? endDate);
       return {
         startDate,
         endDate: customEndDate,
diff --git a/src/types/usage.ts b/src/types/usage.ts
index 6e6f957dd8..256d58aec6 100644
--- a/src/types/usage.ts
+++ b/src/types/usage.ts
@@ -152,6 +152,9 @@ export interface UsageRangeSelection {
   preset: UsageRangePreset;
   customStartDate?: number;
   customEndDate?: number;
+  /** When true (custom mode only), endDate resolves to "now" instead of the
+   *  fixed customEndDate snapshot, and the end-time field becomes read-only. */
+  liveEndTime?: boolean;
 }
 
 /**