diff --git a/web/src/features/monitor/UsageTab.vue b/web/src/features/monitor/UsageTab.vue
index 1add2508..2bb39727 100644
--- a/web/src/features/monitor/UsageTab.vue
+++ b/web/src/features/monitor/UsageTab.vue
@@ -24,7 +24,8 @@ import EmptyState from '@/components/ui/EmptyState.vue'
 import InlineFeedback from '@/components/ui/InlineFeedback.vue'
 import QueryFeedback from '@/components/ui/QueryFeedback.vue'
 import StatusBadge from '@/components/ui/StatusBadge.vue'
-import { formatEstimatedCost, formatInteger, formatTokens } from '@/lib/format'
+import { formatCacheHitRate } from '@/lib/cache-rate'
+import { formatEstimatedCost, formatInteger, formatPercent, formatTokens } from '@/lib/format'
 
 import MonitorSectionHeading from './MonitorSectionHeading.vue'
 import {
@@ -84,6 +85,20 @@ function formatCost(aggregate: UsageAggregateDto): string {
   return formatEstimatedCost(aggregate.estimated_cost_nano_usd, locale.value)
 }
 
+function inputTokens(aggregate: UsageAggregateDto): number {
+  return (
+    aggregate.uncached_input_tokens +
+    aggregate.cache_read_tokens +
+    aggregate.cache_write_5m_tokens +
+    aggregate.cache_write_1h_tokens +
+    aggregate.cache_write_unknown_tokens
+  )
+}
+
+function cacheRateLabel(aggregate: UsageAggregateDto): string {
+  return formatCacheHitRate(aggregate.cache_read_tokens, inputTokens(aggregate), locale.value)
+}
+
 function groupName(groupID: number): string {
   if (groupID === 0) return t('monitor.usage.breakdown.unattributedGroup')
   return (
@@ -369,17 +384,15 @@ defineExpose({ openFilters })
                   <span class="usage-cell-label">{{ t('monitor.usage.columns.quality') }}</span>
                   <span>
                     {{
-                      t('monitor.usage.columns.qualityUsage', {
-                        missing: formatInteger(row.usage_missing_count, locale),
-                        partial: formatInteger(row.partial_count, locale),
+                      t('monitor.usage.columns.qualitySuccess', {
+                        rate: formatPercent(row.success_count, row.request_count, locale),
                       })
                     }}
                   </span>
                   <small>
                     {{
-                      t('monitor.usage.columns.qualityPricing', {
-                        unpriced: formatInteger(row.unpriced_request_count, locale),
-                        partial: formatInteger(row.pricing_partial_count, locale),
+                      t('monitor.usage.columns.qualityCache', {
+                        rate: cacheRateLabel(row),
                       })
                     }}
                   </small>
diff --git a/web/src/i18n/locales/en-US/monitor.ts b/web/src/i18n/locales/en-US/monitor.ts
index b1cb03b1..dacf2415 100644
--- a/web/src/i18n/locales/en-US/monitor.ts
+++ b/web/src/i18n/locales/en-US/monitor.ts
@@ -335,6 +335,8 @@ export default {
         estimatedCost: 'Estimated cost',
         quality: 'Quality',
         actions: 'Actions',
+        qualitySuccess: 'Success rate {rate}',
+        qualityCache: 'Cache hit rate {rate}',
         qualityUsage: 'Missing {missing} · Partial {partial}',
         qualityPricing: 'Unpriced {unpriced} · Partial {partial}',
         qualityCompact:
diff --git a/web/src/i18n/locales/ja-JP/monitor.ts b/web/src/i18n/locales/ja-JP/monitor.ts
index 751070f0..8996ced1 100644
--- a/web/src/i18n/locales/ja-JP/monitor.ts
+++ b/web/src/i18n/locales/ja-JP/monitor.ts
@@ -336,6 +336,8 @@ export default {
         estimatedCost: '推定コスト',
         quality: '品質',
         actions: '操作',
+        qualitySuccess: '成功率 {rate}',
+        qualityCache: 'キャッシュ率 {rate}',
         qualityUsage: 'なし {missing} · 部分 {partial}',
         qualityPricing: '未設定 {unpriced} · 一部 {partial}',
         qualityCompact:
diff --git a/web/src/i18n/locales/zh-CN/monitor.ts b/web/src/i18n/locales/zh-CN/monitor.ts
index ff8b9326..418d9944 100644
--- a/web/src/i18n/locales/zh-CN/monitor.ts
+++ b/web/src/i18n/locales/zh-CN/monitor.ts
@@ -323,6 +323,8 @@ export default {
         estimatedCost: '预估成本',
         quality: '质量',
         actions: '操作',
+        qualitySuccess: '成功率 {rate}',
+        qualityCache: '缓存率 {rate}',
         qualityUsage: '缺失 {missing} · 部分 {partial}',
         qualityPricing: '未定价 {unpriced} · 部分定价 {partial}',
         qualityCompact: