diff --git a/src/client/index.ts b/src/client/index.ts
index 294de62..ec454b9 100644
--- a/src/client/index.ts
+++ b/src/client/index.ts
@@ -119,9 +119,9 @@ select.cc-input{appearance:none;-webkit-appearance:none;-moz-appearance:none;box
 .cc-usageHint{color:var(--dsw-alias-label-tertiary);margin:0;font-size:12px;line-height:1.5}
 .cc-usageError{align-items:center;gap:8px;color:var(--dsw-alias-label-error);margin:0;font-size:12px;line-height:1.5;display:flex}
 .cc-usageStats{grid-template-columns:repeat(auto-fit,minmax(120px,1fr));gap:8px;display:grid}
-.cc-usageStat{border:1px solid var(--dsw-alias-border-l2);background:var(--dsw-alias-bg-layer-1);border-radius:8px;padding:8px 10px;flex-direction:column;gap:2px;display:flex}
+.cc-usageStat{border:1px solid var(--dsw-alias-border-l2);background:var(--dsw-alias-bg-layer-1);border-radius:8px;padding:8px 10px;flex-direction:column;gap:2px;display:flex;min-width:0}
 .cc-usageStatLabel{color:var(--dsw-alias-label-tertiary);font-size:11px;line-height:1.5}
-.cc-usageStatValue{color:var(--dsw-alias-label-primary);font-size:15px;font-weight:600;line-height:1.4}
+.cc-usageStatValue{color:var(--dsw-alias-label-primary);font-size:15px;font-weight:600;line-height:1.4;min-width:0;overflow-wrap:anywhere}
 .cc-usageStatSub{color:var(--dsw-alias-label-tertiary);font-size:11px;line-height:1.5}
 .cc-usageWindows{flex-direction:column;gap:16px;display:flex}
 .cc-usageWindow{flex-direction:column;gap:6px;display:flex}
diff --git a/src/client/section.tsx b/src/client/section.tsx
index c6ce45c..3cd5706 100644
--- a/src/client/section.tsx
+++ b/src/client/section.tsx
@@ -27,7 +27,7 @@ import type { AccountItemState, CatalogModelOption, RuleItemState, SettingsPageS
 import type { CommandCodeLoginFailureReason } from '../login-wire.ts'
 import type { LoginPageState } from './login.ts'
 import type { UsagePageState } from './usage.ts'
-import { formatMoney, formatMoneyExact, formatResetAt, formatTokensCompact, windowRatio } from './usage.ts'
+import { formatMoney, formatMoneyExact, formatPercent, formatResetAt, formatTokensCompact, windowRatio } from './usage.ts'
 import { PLUGIN_RELEASES_URL, PLUGIN_VERSION } from './version.ts'
 import { checkForUpdate, localStorageUpdateStore } from './update.ts'
 
@@ -540,7 +540,7 @@ function AccountReport({ entry, fetchedAt, t, onRemove }: {
             value={String(report.usage.completedCount)}
             sub={`${t('usageFailed')} ${report.usage.failedCount}`}
           />
-          <UsageStat label={t('usageSuccessRate')} value={`${report.usage.successRate}%`} />
+          <UsageStat label={t('usageSuccessRate')} value={formatPercent(report.usage.successRate)} />
           <UsageStat
             label={t('usageCost')}
             value={formatMoneyExact(report.usage.totalCost)}
diff --git a/src/client/usage.ts b/src/client/usage.ts
index c1cc737..2b1e95e 100644
--- a/src/client/usage.ts
+++ b/src/client/usage.ts
@@ -173,6 +173,11 @@ export function formatTokensCompact(value: number): string {
   return String(value)
 }
 
+/** Format a rate as a percentage with 2 decimals (99.99% style). */
+export function formatPercent(value: number): string {
+  return `${value.toFixed(2)}%`
+}
+
 /** One window's fill ratio in [0, 1]; 0 when uncapped. */
 export function windowRatio(used: number, cap: number): number {
   if (cap <= 0) return 0
diff --git a/src/commands.ts b/src/commands.ts
index ead1958..205e78a 100644
--- a/src/commands.ts
+++ b/src/commands.ts
@@ -139,7 +139,7 @@ function renderReport(report: CommandCodeUsageReport, locale: LocaleId, title?:
       commandCopy(locale, 'requestsLine')
         .replace('{n}', String(u.completedCount))
         .replace('{f}', String(u.failedCount))
-        .replace('{r}', String(u.successRate)),
+        .replace('{r}', u.successRate.toFixed(2)),
       commandCopy(locale, 'costLine')
         .replace('{money}', money(u.totalCost))
         .replace('{credits}', moneyShort(u.totalCredits)),
diff --git a/tests/commands.test.ts b/tests/commands.test.ts
index c89fe1f..20983e5 100644
--- a/tests/commands.test.ts
+++ b/tests/commands.test.ts
@@ -197,7 +197,7 @@ test('command renders a full usage report in zh', async () => {
   assert.equal(result.kind, 'success')
   assert.match(result.text, /mars-sea/)
   assert.match(result.text, /935 次/)
-  assert.match(result.text, /成功率 100%/)
+  assert.match(result.text, /成功率 100.00%/)
   assert.match(result.text, /\$1\.3187/)
   assert.match(result.text, /\$8\.68/)
   assert.match(result.text, /5 小时/)
@@ -232,7 +232,7 @@ test('command renders a full usage report in en', async () => {
   assert.equal(result.kind, 'success')
   assert.match(result.text, /mars-sea/)
   assert.match(result.text, /Requests 935/)
-  assert.match(result.text, /success rate 100%/)
+  assert.match(result.text, /success rate 100.00%/)
   assert.match(result.text, /\$1\.3187/)
   assert.match(result.text, /\$8\.68/)
   assert.match(result.text, /5-hour/)
diff --git a/tests/usage-client.test.ts b/tests/usage-client.test.ts
index e811fea..8568007 100644
--- a/tests/usage-client.test.ts
+++ b/tests/usage-client.test.ts
@@ -13,6 +13,7 @@ import {
   CommandCodeUsageController,
   formatMoney,
   formatMoneyExact,
+  formatPercent,
   formatResetAt,
   formatTokensCompact,
   windowRatio,
@@ -148,6 +149,13 @@ test('formatTokensCompact renders K/M/B suffixes', () => {
   assert.equal(formatTokensCompact(3_000_000_000), '3.0B')
 })
 
+test('formatPercent renders a percentage with 2 decimals', () => {
+  assert.equal(formatPercent(99.9882890268181), '99.99%')
+  assert.equal(formatPercent(100), '100.00%')
+  assert.equal(formatPercent(99), '99.00%')
+  assert.equal(formatPercent(0), '0.00%')
+})
+
 test('windowRatio clamps into [0, 1] and treats cap 0 as empty', () => {
   assert.equal(windowRatio(1.5, 5), 0.3)
   assert.equal(windowRatio(10, 5), 1)