diff --git a/open-sse/handlers/chatCore.ts b/open-sse/handlers/chatCore.ts
index 0f93991bd2..d643961e9e 100644
--- a/open-sse/handlers/chatCore.ts
+++ b/open-sse/handlers/chatCore.ts
@@ -214,6 +214,7 @@ import { stageTrace } from "./chatCore/stageTrace.ts";
 import { attachCompressionUsageReceiptAfterAnalytics as attachCompressionUsageReceiptAfterAnalyticsFor } from "./chatCore/compressionUsageReceipt.ts";
 import { prepareUpstreamBody } from "./chatCore/upstreamBody.ts";
 import { getQuotaScopeLabelForProvider } from "../services/antigravityQuotaFamily.ts";
+import { getKimiTemporaryRateLimitResetAt } from "./chatCore/kimiQuotaRecovery.ts";
 import {
   getCallLogPipelineCaptureStreamChunks,
   getCallLogPipelineMaxSizeBytes,
@@ -3734,8 +3735,25 @@ export async function handleChatCore({
             );
           }
         } else if (errorType === PROVIDER_ERROR_TYPES.QUOTA_EXHAUSTED) {
+          // Kimi's 403 says "billing cycle" for both an exhausted subscription and a
+          // temporary request window. Read its official usage endpoint before making
+          // the connection terminal: a non-zero Weekly quota plus an empty Ratelimit
+          // window must recover automatically at the reported reset time.
+          let kimiRateLimitResetAt: string | null = null;
+          if (provider === "kimi-coding") {
+            try {
+              const { fetchAndPersistProviderLimits } = await import("@/lib/usage/providerLimits");
+              const { usage } = await fetchAndPersistProviderLimits(errorConnectionId, "manual");
+              kimiRateLimitResetAt = getKimiTemporaryRateLimitResetAt(usage);
+            } catch {
+              // Preserve the existing quota handling when Kimi's usage endpoint is unavailable.
+            }
+          }
+
           // Providers with per-model quotas — lock the model only, not the connection
-          const quotaCooldownMs = retryAfterMs || COOLDOWN_MS.rateLimit;
+          const quotaCooldownMs = kimiRateLimitResetAt
+            ? Math.max(new Date(kimiRateLimitResetAt).getTime() - Date.now(), 0)
+            : retryAfterMs || COOLDOWN_MS.rateLimit;
           const accountSemaphoreKey = resolveAccountSemaphoreKey({
             provider,
             model: currentModel,
@@ -3745,7 +3763,19 @@ export async function handleChatCore({
           if (accountSemaphoreKey) {
             markAccountSemaphoreBlocked(accountSemaphoreKey, quotaCooldownMs);
           }
-          if (isModelScope() && errorConnectionId) {
+          if (kimiRateLimitResetAt) {
+            await updateProviderConnection(errorConnectionId, {
+              testStatus: "unavailable",
+              rateLimitedUntil: kimiRateLimitResetAt,
+              backoffLevel: 0,
+              lastErrorType: PROVIDER_ERROR_TYPES.RATE_LIMITED,
+              lastError: message,
+              errorCode: statusCode,
+            });
+            console.warn(
+              `[provider] Node ${errorConnectionId} Kimi request window exhausted (${statusCode}) — retrying after ${kimiRateLimitResetAt}`
+            );
+          } else if (isModelScope() && errorConnectionId) {
             const lockFn = provider === "antigravity" ? lockExactModel : lockModel;
             lockFn(provider, errorConnectionId, model, "quota_exhausted", quotaCooldownMs);
             console.warn(
diff --git a/open-sse/handlers/chatCore/kimiQuotaRecovery.ts b/open-sse/handlers/chatCore/kimiQuotaRecovery.ts
new file mode 100644
index 0000000000..66ceedbf4d
--- /dev/null
+++ b/open-sse/handlers/chatCore/kimiQuotaRecovery.ts
@@ -0,0 +1,42 @@
+type JsonRecord = Record<string, unknown>;
+
+function asRecord(value: unknown): JsonRecord | null {
+  return value && typeof value === "object" && !Array.isArray(value) ? (value as JsonRecord) : null;
+}
+
+function remaining(value: JsonRecord | null): number | null {
+  if (!value) return null;
+  const candidate = value.remaining ?? value.remainingPercentage;
+  const parsed = typeof candidate === "number" ? candidate : Number(candidate);
+  return Number.isFinite(parsed) ? parsed : null;
+}
+
+/**
+ * Kimi uses the same 403 wording for two different conditions:
+ * a depleted weekly subscription and a temporary request window. The latter
+ * must stay recoverable, otherwise a healthy subscription is marked terminal.
+ */
+export function getKimiTemporaryRateLimitResetAt(
+  usage: unknown,
+  nowMs = Date.now()
+): string | null {
+  const quotas = asRecord(asRecord(usage)?.quotas);
+  const rateLimit = asRecord(quotas?.Ratelimit);
+  const weekly = asRecord(quotas?.Weekly);
+  const rateLimitRemaining = remaining(rateLimit);
+  const weeklyRemaining = remaining(weekly);
+  const resetAt = typeof rateLimit?.resetAt === "string" ? rateLimit.resetAt : null;
+  const resetMs = resetAt ? new Date(resetAt).getTime() : NaN;
+
+  if (
+    rateLimitRemaining !== 0 ||
+    weeklyRemaining === null ||
+    weeklyRemaining <= 0 ||
+    !Number.isFinite(resetMs) ||
+    resetMs <= nowMs
+  ) {
+    return null;
+  }
+
+  return resetAt;
+}
diff --git a/tests/unit/kimi-temporary-rate-limit.test.ts b/tests/unit/kimi-temporary-rate-limit.test.ts
new file mode 100644
index 0000000000..809f9eceea
--- /dev/null
+++ b/tests/unit/kimi-temporary-rate-limit.test.ts
@@ -0,0 +1,34 @@
+import assert from "node:assert/strict";
+import test from "node:test";
+import { getKimiTemporaryRateLimitResetAt } from "../../open-sse/handlers/chatCore/kimiQuotaRecovery.ts";
+
+const NOW = Date.parse("2026-08-11T01:00:00.000Z");
+const RESET_AT = "2026-08-11T04:49:07.783Z";
+
+test("Kimi temporary request limit stays recoverable when weekly quota remains", () => {
+  const resetAt = getKimiTemporaryRateLimitResetAt(
+    {
+      quotas: {
+        Ratelimit: { remaining: 0, resetAt: RESET_AT },
+        Weekly: { remaining: 14 },
+      },
+    },
+    NOW
+  );
+
+  assert.equal(resetAt, RESET_AT);
+});
+
+test("Kimi depleted weekly quota is not mistaken for a temporary request limit", () => {
+  const resetAt = getKimiTemporaryRateLimitResetAt(
+    {
+      quotas: {
+        Ratelimit: { remaining: 0, resetAt: RESET_AT },
+        Weekly: { remaining: 0 },
+      },
+    },
+    NOW
+  );
+
+  assert.equal(resetAt, null);
+});