diff --git a/src/providers/grok.ts b/src/providers/grok.ts
index 098eb3b..d710f9d 100644
--- a/src/providers/grok.ts
+++ b/src/providers/grok.ts
@@ -352,12 +352,15 @@ export async function fetchGrokUsage(
   const payload = await response.json() as { config?: GrokBillingConfig | null; subscriptionTier?: string }
   const config = typeof payload.config === 'object' && payload.config !== null ? payload.config : {}
   const windows: UsageWindow[] = []
-  if (typeof config.creditUsagePercent === 'number' && Number.isFinite(config.creditUsagePercent)) {
+  if (config.currentPeriod || (typeof config.creditUsagePercent === 'number' && Number.isFinite(config.creditUsagePercent))) {
     const kind: UsageWindow['kind'] = config.currentPeriod?.type === 'USAGE_PERIOD_TYPE_WEEKLY'
       ? 'weekly'
       : 'other'
     const resetsAt = grokResetsAt(config.currentPeriod?.end)
-    windows.push({ kind, usedPercent: config.creditUsagePercent, ...resetsAt === undefined ? {} : { resetsAt } })
+    const usedPercent = typeof config.creditUsagePercent === 'number' && Number.isFinite(config.creditUsagePercent)
+      ? config.creditUsagePercent
+      : 0
+    windows.push({ kind, usedPercent, ...resetsAt === undefined ? {} : { resetsAt } })
   } else if (typeof config.monthlyLimit?.val === 'number' && config.monthlyLimit.val > 0) {
     const used = typeof config.used?.val === 'number' ? config.used.val : 0
     const resetsAt = grokResetsAt(config.billingPeriodEnd)
diff --git a/test/usage.spec.ts b/test/usage.spec.ts
index 674d64e..0fef6c0 100644
--- a/test/usage.spec.ts
+++ b/test/usage.spec.ts
@@ -276,6 +276,20 @@ test('fetchGrokUsage tolerates a null config and non-2xx responses', async () =>
   await assert.rejects(fetchGrokUsage(grokSession, failing), /grok billing/)
 })
 
+test('fetchGrokUsage extracts reset window when creditUsagePercent is absent but currentPeriod is present', async () => {
+  const { fetchFn } = fakeFetch({
+    config: {
+      currentPeriod: { type: 'USAGE_PERIOD_TYPE_WEEKLY', end: '2026-09-10T12:00:00Z' },
+    },
+  })
+  const usage = await fetchGrokUsage(grokSession, fetchFn)
+  assert.ok(usage.windows)
+  assert.equal(usage.windows.length, 1)
+  assert.equal(usage.windows[0]?.kind, 'weekly')
+  assert.equal(usage.windows[0]?.usedPercent, 0)
+  assert.equal(usage.windows[0]?.resetsAt, Date.parse('2026-09-10T12:00:00Z'))
+})
+
 /** Mount the plugin with fake llm/connection; return the RPC handler. */
 async function mount(): Promise<ConnectionRpcHandler> {
   let handler: ConnectionRpcHandler | undefined