diff --git a/packages/ai/CHANGELOG.md b/packages/ai/CHANGELOG.md
index 8a57eb6bf..5174d1149 100644
--- a/packages/ai/CHANGELOG.md
+++ b/packages/ai/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## [Unreleased]
 
+### Fixed
+
+- Fixed Kimi Code usage reports dropping the 5h window reset time (`omp usage` showed no "resets in …" for the 5h limit): the API returns `resetTime` on the limit `detail`, not on `window`, so the parsed row-level reset is now carried onto the window when the window itself has none.
+
 ## [17.0.3] - 2026-07-17
 
 ### Fixed
diff --git a/packages/ai/src/usage/kimi.ts b/packages/ai/src/usage/kimi.ts
index 17c6a2e6f..10c2db5d5 100644
--- a/packages/ai/src/usage/kimi.ts
+++ b/packages/ai/src/usage/kimi.ts
@@ -144,15 +144,21 @@ function buildUsageStatus(amount: UsageAmount): UsageStatus {
 }
 
 function toUsageLimit(row: KimiUsageRow, provider: string, index: number, accountId?: string): UsageLimit {
-	const window: UsageWindow | undefined =
-		row.window ??
-		(row.resetsAt
+	// Kimi puts `resetTime` on the limit `detail`, not on `window`, so a
+	// window built from `duration`/`timeUnit` alone carries no resetsAt.
+	// Fall back to the row-level reset so `omp usage` can render
+	// "resets in …" for the 5h window too.
+	const window: UsageWindow | undefined = row.window
+		? row.window.resetsAt !== undefined || row.resetsAt === undefined
+			? row.window
+			: { ...row.window, resetsAt: row.resetsAt }
+		: row.resetsAt
 			? {
 					id: "default",
 					label: "Usage window",
 					resetsAt: row.resetsAt,
 				}
-			: undefined);
+			: undefined;
 
 	const amount = buildUsageAmount(row);
 	return {
diff --git a/packages/ai/test/kimi-usage.test.ts b/packages/ai/test/kimi-usage.test.ts
new file mode 100644
index 000000000..b86b66310
--- /dev/null
+++ b/packages/ai/test/kimi-usage.test.ts
@@ -0,0 +1,74 @@
+import { describe, expect, it } from "bun:test";
+import type { FetchImpl } from "@oh-my-pi/pi-ai/types";
+import type { UsageFetchContext, UsageFetchParams } from "@oh-my-pi/pi-ai/usage";
+import { kimiUsageProvider } from "@oh-my-pi/pi-ai/usage/kimi";
+
+function makeCredential(): UsageFetchParams["credential"] {
+	return {
+		type: "oauth",
+		accessToken: "kimi-test-token",
+	};
+}
+
+function makeCtx(payload: unknown): UsageFetchContext {
+	const fetch: FetchImpl = async () =>
+		new Response(JSON.stringify(payload), {
+			status: 200,
+			headers: { "content-type": "application/json" },
+		});
+	return { fetch };
+}
+
+describe("kimi usage provider", () => {
+	it("surfaces the 5h limit reset time from the limit detail onto the window", async () => {
+		// Live payload shape: `resetTime` lives on `detail`, while `window`
+		// carries only duration/timeUnit. The 5h row must still render
+		// "resets in …" in `omp usage`.
+		const detailReset = "2026-07-18T05:43:35.355947Z";
+		const usageReset = "2026-07-21T07:43:35.355947Z";
+		const report = await kimiUsageProvider.fetchUsage!(
+			{ provider: "kimi-code", credential: makeCredential(), signal: undefined },
+			makeCtx({
+				usage: { limit: "100", used: "28", remaining: "72", resetTime: usageReset },
+				limits: [
+					{
+						window: { duration: 300, timeUnit: "TIME_UNIT_MINUTE" },
+						detail: { limit: "100", remaining: "100", resetTime: detailReset },
+					},
+				],
+			}),
+		);
+
+		expect(report).not.toBeNull();
+		expect(report!.limits).toHaveLength(2);
+
+		const total = report!.limits[0]!;
+		expect(total.label).toBe("Total quota");
+		expect(total.window?.resetsAt).toBe(Date.parse(usageReset));
+
+		const fiveHour = report!.limits[1]!;
+		expect(fiveHour.label).toBe("5h limit");
+		expect(fiveHour.window?.durationMs).toBe(5 * 60 * 60 * 1000);
+		expect(fiveHour.window?.resetsAt).toBe(Date.parse(detailReset));
+	});
+
+	it("keeps an explicit window resetTime authoritative over the detail one", async () => {
+		const windowReset = "2026-07-18T06:00:00.000Z";
+		const detailReset = "2026-07-18T05:43:35.355947Z";
+		const report = await kimiUsageProvider.fetchUsage!(
+			{ provider: "kimi-code", credential: makeCredential(), signal: undefined },
+			makeCtx({
+				limits: [
+					{
+						window: { duration: 300, timeUnit: "TIME_UNIT_MINUTE", resetTime: windowReset },
+						detail: { limit: "100", remaining: "40", resetTime: detailReset },
+					},
+				],
+			}),
+		);
+
+		expect(report).not.toBeNull();
+		expect(report!.limits).toHaveLength(1);
+		expect(report!.limits[0]!.window?.resetsAt).toBe(Date.parse(windowReset));
+	});
+});