diff --git a/frontend/src/api/admin/channels.ts b/frontend/src/api/admin/channels.ts
index 6556417ced..9ce50bcd0a 100644
--- a/frontend/src/api/admin/channels.ts
+++ b/frontend/src/api/admin/channels.ts
@@ -17,6 +17,10 @@ export interface PricingInterval {
   output_price: number | null
   cache_write_price: number | null
   cache_read_price: number | null
+  input_multiplier: number | null
+  output_multiplier: number | null
+  cache_write_multiplier: number | null
+  cache_read_multiplier: number | null
   per_request_price: number | null
   sort_order: number
 }
@@ -41,6 +45,8 @@ export interface ChannelModelPricing {
   output_price: number | null
   cache_write_price: number | null
   cache_read_price: number | null
+  fast_multiplier?: number | null
+  flex_multiplier?: number | null
   image_input_price: number | null
   image_output_price: number | null
   per_request_price: number | null
diff --git a/frontend/src/components/account/CreateAccountModal.vue b/frontend/src/components/account/CreateAccountModal.vue
index 55a0831ae1..fdcf33107a 100644
--- a/frontend/src/components/account/CreateAccountModal.vue
+++ b/frontend/src/components/account/CreateAccountModal.vue
@@ -2957,7 +2957,7 @@
 
       <!-- OpenAI WS Mode 三态（off/ctx_pool/passthrough） -->
       <div
-        v-if="form.platform === 'openai' && (accountCategory === 'oauth-based' || accountCategory === 'apikey')"
+        v-if="form.platform === 'openai' && !hideAccountLongContextBilling && (accountCategory === 'oauth-based' || accountCategory === 'apikey')"
         class="border-t border-gray-200 pt-4 dark:border-dark-600"
       >
         <div class="flex items-center justify-between">
@@ -3740,6 +3740,7 @@ import Toggle from '@/components/common/Toggle.vue'
 import GrokBaseUrlPresets from '@/components/account/GrokBaseUrlPresets.vue'
 import CnBaseUrlPresets from '@/components/account/CnBaseUrlPresets.vue'
 import HeaderOverrideEditor from '@/components/account/HeaderOverrideEditor.vue'
+import { allSelectedGroupsEnableLongContextPricing } from '@/components/account/longContextBilling'
 import {
   applyAntigravityProjectID,
   applyHeaderOverride,
@@ -3857,6 +3858,10 @@ const emit = defineEmits<{
 
 const appStore = useAppStore()
 
+const hideAccountLongContextBilling = computed(() => {
+  return allSelectedGroupsEnableLongContextPricing(form.group_ids, props.groups)
+})
+
 // OAuth composables
 const oauth = useAccountOAuth() // For Anthropic OAuth
 const openaiOAuth = useOpenAIOAuth() // For OpenAI OAuth
diff --git a/frontend/src/components/account/EditAccountModal.vue b/frontend/src/components/account/EditAccountModal.vue
index 9369b229aa..6495b61e6a 100644
--- a/frontend/src/components/account/EditAccountModal.vue
+++ b/frontend/src/components/account/EditAccountModal.vue
@@ -1966,7 +1966,7 @@
 
       <!-- OpenAI API 长上下文计费开关 -->
       <div
-        v-if="account?.platform === 'openai' && !isSparkShadow && (account?.type === 'oauth' || account?.type === 'setup-token' || account?.type === 'apikey')"
+        v-if="account?.platform === 'openai' && !isSparkShadow && !hideAccountLongContextBilling && (account?.type === 'oauth' || account?.type === 'setup-token' || account?.type === 'apikey')"
         class="border-t border-gray-200 pt-4 dark:border-dark-600"
       >
         <div class="flex items-center justify-between gap-4">
@@ -2811,6 +2811,7 @@ import {
 } from '@/components/account/credentialsBuilder'
 import { formatDateTime, formatDateTimeLocalInput, parseDateTimeLocalInput } from '@/utils/format'
 import { createStableObjectKeyResolver } from '@/utils/stableObjectKey'
+import { allSelectedGroupsEnableLongContextPricing } from '@/components/account/longContextBilling'
 import { VERTEX_LOCATION_OPTIONS } from '@/constants/account'
 import {
   OPENAI_WS_MODE_CTX_POOL,
@@ -2851,6 +2852,10 @@ const authStore = useAuthStore()
 // 故隐藏代理选择器。
 const isSparkShadow = computed(() => props.account?.parent_account_id != null)
 
+const hideAccountLongContextBilling = computed(() => {
+  return allSelectedGroupsEnableLongContextPricing(form.group_ids, props.groups)
+})
+
 const handleOllamaCloudUsageUpdated = (state: OllamaCloudUsageState) => {
   if (props.account) emit('updated', { ...props.account, ollama_cloud_usage: state })
 }
diff --git a/frontend/src/components/account/__tests__/longContextBilling.spec.ts b/frontend/src/components/account/__tests__/longContextBilling.spec.ts
new file mode 100644
index 0000000000..70e2c55695
--- /dev/null
+++ b/frontend/src/components/account/__tests__/longContextBilling.spec.ts
@@ -0,0 +1,29 @@
+import { describe, expect, it } from 'vitest'
+
+import { allSelectedGroupsEnableLongContextPricing } from '../longContextBilling'
+
+const group = (id: number, enabled: boolean) => ({
+  id,
+  long_context_pricing_enabled: enabled,
+}) as any
+
+describe('allSelectedGroupsEnableLongContextPricing', () => {
+  it('hides the account override when every selected group enables tier pricing', () => {
+    expect(allSelectedGroupsEnableLongContextPricing(
+      [1, 2],
+      [group(1, true), group(2, true)]
+    )).toBe(true)
+  })
+
+  it('keeps the account override when any selected group disables tier pricing', () => {
+    expect(allSelectedGroupsEnableLongContextPricing(
+      [1, 2],
+      [group(1, true), group(2, false)]
+    )).toBe(false)
+  })
+
+  it('keeps the account override when selection is empty or group data is incomplete', () => {
+    expect(allSelectedGroupsEnableLongContextPricing([], [group(1, true)])).toBe(false)
+    expect(allSelectedGroupsEnableLongContextPricing([1, 2], [group(1, true)])).toBe(false)
+  })
+})
diff --git a/frontend/src/components/account/longContextBilling.ts b/frontend/src/components/account/longContextBilling.ts
new file mode 100644
index 0000000000..38c64391b5
--- /dev/null
+++ b/frontend/src/components/account/longContextBilling.ts
@@ -0,0 +1,11 @@
+import type { AdminGroup } from '@/types'
+
+export function allSelectedGroupsEnableLongContextPricing(
+  groupIds: number[],
+  groups: AdminGroup[]
+): boolean {
+  if (groupIds.length === 0) return false
+  const selectedGroups = groups.filter(group => groupIds.includes(group.id))
+  return selectedGroups.length === groupIds.length &&
+    selectedGroups.every(group => group.long_context_pricing_enabled === true)
+}
diff --git a/frontend/src/components/admin/channel/IntervalRow.vue b/frontend/src/components/admin/channel/IntervalRow.vue
index 7036a82986..0166e510a6 100644
--- a/frontend/src/components/admin/channel/IntervalRow.vue
+++ b/frontend/src/components/admin/channel/IntervalRow.vue
@@ -3,35 +3,59 @@
        :class="isEmpty ? 'border-red-400 bg-red-50 dark:border-red-500 dark:bg-red-950/20' : 'border-gray-200 bg-white dark:border-dark-500 dark:bg-dark-700'">
     <!-- Token mode: context range + prices ($/MTok) -->
     <template v-if="mode === 'token'">
-      <div class="w-20">
-        <label class="text-xs text-gray-400">{{ t('admin.channels.form.minTokens') }}</label>
-        <input :value="interval.min_tokens" @input="emitField('min_tokens', toInt(($event.target as HTMLInputElement).value))"
-          type="number" min="0" class="input mt-0.5 text-xs" />
-      </div>
-      <div class="w-20">
-        <label class="text-xs text-gray-400">{{ t('admin.channels.form.maxTokens') }} <span class="text-gray-300">{{ t('admin.channels.form.inclusive') }}</span></label>
-        <input :value="interval.max_tokens ?? ''" @input="emitField('max_tokens', toIntOrNull(($event.target as HTMLInputElement).value))"
-          type="number" min="0" class="input mt-0.5 text-xs" :placeholder="'∞'" />
-      </div>
-      <div class="flex-1">
-        <label class="text-xs text-gray-400">{{ t('admin.channels.form.inputPrice') }} <span v-if="isEmpty" class="text-red-500">*</span> <span class="text-gray-300">$/M</span></label>
-        <input :value="interval.input_price" @input="emitField('input_price', ($event.target as HTMLInputElement).value)"
-          type="number" step="any" min="0" class="input mt-0.5 text-xs" />
-      </div>
-      <div class="flex-1">
-        <label class="text-xs text-gray-400">{{ t('admin.channels.form.outputPrice') }} <span v-if="isEmpty" class="text-red-500">*</span> <span class="text-gray-300">$/M</span></label>
-        <input :value="interval.output_price" @input="emitField('output_price', ($event.target as HTMLInputElement).value)"
-          type="number" step="any" min="0" class="input mt-0.5 text-xs" />
-      </div>
-      <div class="flex-1">
-        <label class="text-xs text-gray-400">{{ t('admin.channels.form.cacheWritePriceShort') }} <span class="text-gray-300">$/M</span></label>
-        <input :value="interval.cache_write_price" @input="emitField('cache_write_price', ($event.target as HTMLInputElement).value)"
-          type="number" step="any" min="0" class="input mt-0.5 text-xs" />
-      </div>
-      <div class="flex-1">
-        <label class="text-xs text-gray-400">{{ t('admin.channels.form.cacheReadPriceShort') }} <span class="text-gray-300">$/M</span></label>
-        <input :value="interval.cache_read_price" @input="emitField('cache_read_price', ($event.target as HTMLInputElement).value)"
-          type="number" step="any" min="0" class="input mt-0.5 text-xs" />
+      <div class="grid min-w-0 flex-1 grid-cols-2 gap-2 sm:grid-cols-4 xl:grid-cols-6">
+        <div>
+          <label class="text-xs text-gray-400">{{ t('admin.channels.form.minTokens') }}</label>
+          <input :value="interval.min_tokens" @input="emitField('min_tokens', toInt(($event.target as HTMLInputElement).value))"
+            type="number" min="0" class="input mt-0.5 text-xs" />
+        </div>
+        <div>
+          <label class="text-xs text-gray-400">{{ t('admin.channels.form.maxTokens') }} <span class="text-gray-300">{{ t('admin.channels.form.inclusive') }}</span></label>
+          <input :value="interval.max_tokens ?? ''" @input="emitField('max_tokens', toIntOrNull(($event.target as HTMLInputElement).value))"
+            type="number" min="0" class="input mt-0.5 text-xs" :placeholder="'∞'" />
+        </div>
+        <div>
+          <label class="text-xs text-gray-400">{{ t('admin.channels.form.inputPrice') }} <span v-if="isEmpty" class="text-red-500">*</span> <span class="text-gray-300">$/M</span></label>
+          <input :value="interval.input_price" @input="emitField('input_price', ($event.target as HTMLInputElement).value)"
+            type="number" step="any" min="0" class="input mt-0.5 text-xs" />
+        </div>
+        <div>
+          <label class="text-xs text-gray-400">{{ t('admin.channels.form.outputPrice') }} <span v-if="isEmpty" class="text-red-500">*</span> <span class="text-gray-300">$/M</span></label>
+          <input :value="interval.output_price" @input="emitField('output_price', ($event.target as HTMLInputElement).value)"
+            type="number" step="any" min="0" class="input mt-0.5 text-xs" />
+        </div>
+        <div>
+          <label class="text-xs text-gray-400">{{ t('admin.channels.form.cacheWritePriceShort') }} <span class="text-gray-300">$/M</span></label>
+          <input :value="interval.cache_write_price" @input="emitField('cache_write_price', ($event.target as HTMLInputElement).value)"
+            type="number" step="any" min="0" class="input mt-0.5 text-xs" />
+        </div>
+        <div>
+          <label class="text-xs text-gray-400">{{ t('admin.channels.form.cacheReadPriceShort') }} <span class="text-gray-300">$/M</span></label>
+          <input :value="interval.cache_read_price" @input="emitField('cache_read_price', ($event.target as HTMLInputElement).value)"
+            type="number" step="any" min="0" class="input mt-0.5 text-xs" />
+        </div>
+        <template v-if="enableMultipliers">
+          <div>
+            <label class="text-xs text-gray-400">{{ t('admin.channels.form.inputMultiplier') }}</label>
+            <input :value="interval.input_multiplier" @input="emitField('input_multiplier', ($event.target as HTMLInputElement).value)"
+              type="number" step="any" min="0.000001" class="input mt-0.5 text-xs" />
+          </div>
+          <div>
+            <label class="text-xs text-gray-400">{{ t('admin.channels.form.outputMultiplier') }}</label>
+            <input :value="interval.output_multiplier" @input="emitField('output_multiplier', ($event.target as HTMLInputElement).value)"
+              type="number" step="any" min="0.000001" class="input mt-0.5 text-xs" />
+          </div>
+          <div>
+            <label class="text-xs text-gray-400">{{ t('admin.channels.form.cacheWriteMultiplier') }}</label>
+            <input :value="interval.cache_write_multiplier" @input="emitField('cache_write_multiplier', ($event.target as HTMLInputElement).value)"
+              type="number" step="any" min="0.000001" class="input mt-0.5 text-xs" />
+          </div>
+          <div>
+            <label class="text-xs text-gray-400">{{ t('admin.channels.form.cacheReadMultiplier') }}</label>
+            <input :value="interval.cache_read_multiplier" @input="emitField('cache_read_multiplier', ($event.target as HTMLInputElement).value)"
+              type="number" step="any" min="0.000001" class="input mt-0.5 text-xs" />
+          </div>
+        </template>
       </div>
     </template>
 
@@ -79,6 +103,7 @@ const { t } = useI18n()
 const props = defineProps<{
   interval: IntervalFormEntry
   mode: BillingMode
+  enableMultipliers?: boolean
 }>()
 
 const emit = defineEmits<{
@@ -93,6 +118,10 @@ const isEmpty = computed(() => {
     (iv.output_price == null || iv.output_price === '') &&
     (iv.cache_write_price == null || iv.cache_write_price === '') &&
     (iv.cache_read_price == null || iv.cache_read_price === '') &&
+    (iv.input_multiplier == null || iv.input_multiplier === '') &&
+    (iv.output_multiplier == null || iv.output_multiplier === '') &&
+    (iv.cache_write_multiplier == null || iv.cache_write_multiplier === '') &&
+    (iv.cache_read_multiplier == null || iv.cache_read_multiplier === '') &&
     (iv.per_request_price == null || iv.per_request_price === '')
 })
 
diff --git a/frontend/src/components/admin/channel/PricingEntryCard.vue b/frontend/src/components/admin/channel/PricingEntryCard.vue
index f2a0d6502b..58151455c4 100644
--- a/frontend/src/components/admin/channel/PricingEntryCard.vue
+++ b/frontend/src/components/admin/channel/PricingEntryCard.vue
@@ -139,7 +139,20 @@
             </div>
           </div>
 
-          <!-- Token intervals (channel-only; group long-context uses official presets) -->
+          <div v-if="enableTierMultipliers" class="mt-3 grid max-w-md grid-cols-2 gap-2">
+            <div>
+              <label class="text-xs text-gray-400">{{ t('admin.channels.form.fastMultiplier') }}</label>
+              <input :value="entry.fast_multiplier" @input="emitField('fast_multiplier', ($event.target as HTMLInputElement).value)"
+                type="number" step="any" min="0.000001" class="input mt-0.5 text-sm" :placeholder="t('admin.channels.form.multiplierPlaceholder')" />
+            </div>
+            <div>
+              <label class="text-xs text-gray-400">{{ t('admin.channels.form.flexMultiplier') }}</label>
+              <input :value="entry.flex_multiplier" @input="emitField('flex_multiplier', ($event.target as HTMLInputElement).value)"
+                type="number" step="any" min="0.000001" class="input mt-0.5 text-sm" :placeholder="t('admin.channels.form.multiplierPlaceholder')" />
+            </div>
+          </div>
+
+          <!-- Channel token intervals; the group long-context toggle controls whether tiers apply. -->
           <div v-if="!hideTokenIntervals" class="mt-3">
             <div class="flex items-center justify-between">
               <label class="text-xs font-medium text-gray-500 dark:text-gray-400">
@@ -156,6 +169,7 @@
                 :key="idx"
                 :interval="iv"
                 :mode="entry.billing_mode"
+                :enable-multipliers="enableTierMultipliers"
                 @update="updateInterval(idx, $event)"
                 @remove="removeInterval(idx)"
               />
@@ -262,9 +276,11 @@ const props = withDefaults(defineProps<{
   platform?: string
   hideTokenIntervals?: boolean
   enableTimePricing?: boolean
+  enableTierMultipliers?: boolean
 }>(), {
   hideTokenIntervals: false,
   enableTimePricing: false,
+  enableTierMultipliers: false,
 })
 
 const emit = defineEmits<{
@@ -297,6 +313,8 @@ function addInterval() {
     min_tokens: 0, max_tokens: null, tier_label: '',
     input_price: null, output_price: null, cache_write_price: null,
     cache_read_price: null, per_request_price: null,
+    input_multiplier: null, output_multiplier: null,
+    cache_write_multiplier: null, cache_read_multiplier: null,
     sort_order: intervals.length
   })
   emit('update', { ...props.entry, intervals })
@@ -311,6 +329,8 @@ function addMediaTier() {
     min_tokens: 0, max_tokens: null, tier_label: labels[intervals.length] || '',
     input_price: null, output_price: null, cache_write_price: null,
     cache_read_price: null, per_request_price: null,
+    input_multiplier: null, output_multiplier: null,
+    cache_write_multiplier: null, cache_read_multiplier: null,
     sort_order: intervals.length
   })
   emit('update', { ...props.entry, intervals })
diff --git a/frontend/src/components/admin/channel/__tests__/PricingEntryCard.timePricing.spec.ts b/frontend/src/components/admin/channel/__tests__/PricingEntryCard.timePricing.spec.ts
index 45982256eb..b139f95518 100644
--- a/frontend/src/components/admin/channel/__tests__/PricingEntryCard.timePricing.spec.ts
+++ b/frontend/src/components/admin/channel/__tests__/PricingEntryCard.timePricing.spec.ts
@@ -16,6 +16,8 @@ function createEntry(billingMode: PricingFormEntry['billing_mode'] = 'token'): P
     output_price: null,
     cache_write_price: null,
     cache_read_price: null,
+    fast_multiplier: null,
+    flex_multiplier: null,
     image_input_price: null,
     image_output_price: null,
     per_request_price: null,
@@ -69,3 +71,16 @@ describe('PricingEntryCard time pricing visibility', () => {
     expect(entry.time_pricing.periods).toHaveLength(1)
   })
 })
+
+describe('PricingEntryCard service tier multipliers', () => {
+  it('shows Fast and Flex controls only when explicitly enabled', () => {
+    const hidden = shallowMount(PricingEntryCard, { props: { entry: createEntry() } })
+    expect(hidden.text()).not.toContain('admin.channels.form.fastMultiplier')
+
+    const shown = shallowMount(PricingEntryCard, {
+      props: { entry: createEntry(), enableTierMultipliers: true },
+    })
+    expect(shown.text()).toContain('admin.channels.form.fastMultiplier')
+    expect(shown.text()).toContain('admin.channels.form.flexMultiplier')
+  })
+})
diff --git a/frontend/src/components/admin/channel/__tests__/types.spec.ts b/frontend/src/components/admin/channel/__tests__/types.spec.ts
index b1ebef252a..14430e736f 100644
--- a/frontend/src/components/admin/channel/__tests__/types.spec.ts
+++ b/frontend/src/components/admin/channel/__tests__/types.spec.ts
@@ -1,8 +1,11 @@
 import { describe, expect, it } from 'vitest'
 import {
+  apiIntervalsToForm,
   apiTimePricingToForm,
   createDefaultTimePricingForm,
+  formIntervalsToAPI,
   formTimePricingToAPI,
+  isValidPositiveMultiplier,
   validateIntervals,
   validateTimePricing,
   type IntervalFormEntry,
@@ -10,6 +13,51 @@ import {
   type TimePricingPeriodFormEntry,
 } from '../types'
 
+describe('interval multiplier conversion', () => {
+  it('preserves component multipliers without MTok conversion', () => {
+    const form = apiIntervalsToForm([{
+      min_tokens: 272000,
+      max_tokens: null,
+      tier_label: '',
+      input_price: null,
+      output_price: null,
+      cache_write_price: null,
+      cache_read_price: null,
+      input_multiplier: 2,
+      output_multiplier: 1.5,
+      cache_write_multiplier: 2,
+      cache_read_multiplier: 2,
+      per_request_price: null,
+      sort_order: 0,
+    }])
+
+    expect(form[0].input_multiplier).toBe(2)
+    expect(form[0].output_multiplier).toBe(1.5)
+    expect(formIntervalsToAPI(form)[0]).toMatchObject({
+      input_multiplier: 2,
+      output_multiplier: 1.5,
+      cache_write_multiplier: 2,
+      cache_read_multiplier: 2,
+    })
+  })
+})
+
+describe('positive multiplier validation', () => {
+  it('accepts empty and positive values but rejects zero and negative values', () => {
+    expect(isValidPositiveMultiplier(null)).toBe(true)
+    expect(isValidPositiveMultiplier('')).toBe(true)
+    expect(isValidPositiveMultiplier('0.5')).toBe(true)
+    expect(isValidPositiveMultiplier(0)).toBe(false)
+    expect(isValidPositiveMultiplier(-1)).toBe(false)
+  })
+
+  it('rejects a zero interval multiplier', () => {
+    expect(validateIntervals([
+      makeInterval({ min_tokens: 100, input_multiplier: 0 }),
+    ], 'token', t)).toContain('multiplierPositive')
+  })
+})
+
 function makeInterval(over: Partial<IntervalFormEntry>): IntervalFormEntry {
   return {
     min_tokens: 0,
@@ -19,6 +67,10 @@ function makeInterval(over: Partial<IntervalFormEntry>): IntervalFormEntry {
     output_price: null,
     cache_write_price: null,
     cache_read_price: null,
+    input_multiplier: null,
+    output_multiplier: null,
+    cache_write_multiplier: null,
+    cache_read_multiplier: null,
     per_request_price: null,
     sort_order: 0,
     ...over,
diff --git a/frontend/src/components/admin/channel/types.ts b/frontend/src/components/admin/channel/types.ts
index 322a407c0c..a6b5695ddc 100644
--- a/frontend/src/components/admin/channel/types.ts
+++ b/frontend/src/components/admin/channel/types.ts
@@ -10,6 +10,10 @@ export interface IntervalFormEntry {
   output_price: number | string | null
   cache_write_price: number | string | null
   cache_read_price: number | string | null
+  input_multiplier: number | string | null
+  output_multiplier: number | string | null
+  cache_write_multiplier: number | string | null
+  cache_read_multiplier: number | string | null
   per_request_price: number | string | null
   sort_order: number
 }
@@ -21,6 +25,8 @@ export interface PricingFormEntry {
   output_price: number | string | null
   cache_write_price: number | string | null
   cache_read_price: number | string | null
+  fast_multiplier?: number | string | null
+  flex_multiplier?: number | string | null
   image_input_price: number | string | null
   image_output_price: number | string | null
   per_request_price: number | string | null
@@ -164,6 +170,12 @@ export function toNullableNumber(val: number | string | null | undefined): numbe
   return isNaN(num) ? null : num
 }
 
+export function isValidPositiveMultiplier(val: number | string | null | undefined): boolean {
+  if (val === null || val === undefined || val === '') return true
+  const multiplier = Number(val)
+  return Number.isFinite(multiplier) && multiplier > 0
+}
+
 /** 前端显示值($/MTok) → 后端存储值(per-token) */
 export function mTokToPerToken(val: number | string | null | undefined): number | null {
   const num = toNullableNumber(val)
@@ -186,6 +198,10 @@ export function apiIntervalsToForm(intervals: PricingInterval[]): IntervalFormEn
     output_price: perTokenToMTok(iv.output_price),
     cache_write_price: perTokenToMTok(iv.cache_write_price),
     cache_read_price: perTokenToMTok(iv.cache_read_price),
+    input_multiplier: iv.input_multiplier,
+    output_multiplier: iv.output_multiplier,
+    cache_write_multiplier: iv.cache_write_multiplier,
+    cache_read_multiplier: iv.cache_read_multiplier,
     per_request_price: iv.per_request_price,
     sort_order: iv.sort_order
   }))
@@ -200,6 +216,10 @@ export function formIntervalsToAPI(intervals: IntervalFormEntry[]): PricingInter
     output_price: mTokToPerToken(iv.output_price),
     cache_write_price: mTokToPerToken(iv.cache_write_price),
     cache_read_price: mTokToPerToken(iv.cache_read_price),
+    input_multiplier: toNullableNumber(iv.input_multiplier),
+    output_multiplier: toNullableNumber(iv.output_multiplier),
+    cache_write_multiplier: toNullableNumber(iv.cache_write_multiplier),
+    cache_read_multiplier: toNullableNumber(iv.cache_read_multiplier),
     per_request_price: toNullableNumber(iv.per_request_price),
     sort_order: iv.sort_order
   }))
@@ -332,6 +352,20 @@ function validateIntervalPrices(iv: IntervalFormEntry, idx: number, t: Translate
       )
     }
   }
+  const multipliers: [string, number | string | null][] = [
+    ['inputMultiplier', iv.input_multiplier],
+    ['outputMultiplier', iv.output_multiplier],
+    ['cacheWriteMultiplier', iv.cache_write_multiplier],
+    ['cacheReadMultiplier', iv.cache_read_multiplier],
+  ]
+  for (const [key, val] of multipliers) {
+    if (!isValidPositiveMultiplier(val)) {
+      return intervalValidationMessage(t, 'multiplierPositive', {
+        index,
+        field: intervalPriceLabel(t, key),
+      })
+    }
+  }
   return null
 }
 
diff --git a/frontend/src/i18n/locales/en/admin/channels.ts b/frontend/src/i18n/locales/en/admin/channels.ts
index 41793496f0..48ad1f0b63 100644
--- a/frontend/src/i18n/locales/en/admin/channels.ts
+++ b/frontend/src/i18n/locales/en/admin/channels.ts
@@ -70,6 +70,7 @@ export default {
         maxPositive: 'Interval #{index}: maximum token count ({value}) must be greater than 0',
         maxGreaterThanMin: 'Interval #{index}: maximum token count ({max}) must be greater than minimum token count ({min})',
         negativePrice: 'Interval #{index}: {field} cannot be negative',
+        multiplierPositive: 'Interval #{index}: {field} must be greater than 0',
         unboundedLast: 'Interval #{index}: an unbounded interval (empty maximum token count) must be last',
         overlap: 'Intervals #{previousIndex} and #{currentIndex} overlap: previous upper bound ({previousMax}) is greater than current lower bound ({currentMin})',
         price: {
@@ -128,6 +129,14 @@ export default {
         imageTokenPrice: 'Image Output',
         imageOutputPrice: 'Image Output Price',
         pricePlaceholder: 'Default',
+        fastMultiplier: 'Fast Multiplier',
+        flexMultiplier: 'Flex Multiplier',
+        multiplierPlaceholder: 'Not set',
+        multiplierPositive: 'Fast/Flex multipliers must be greater than 0',
+        inputMultiplier: 'Input Mult.',
+        outputMultiplier: 'Output Mult.',
+        cacheWriteMultiplier: 'Cache Write Mult.',
+        cacheReadMultiplier: 'Cache Read Mult.',
         intervals: 'Context Intervals (optional)',
         timePricing: 'Time-based pricing (optional)',
         timezone: 'Time zone',
diff --git a/frontend/src/i18n/locales/en/admin/overview.ts b/frontend/src/i18n/locales/en/admin/overview.ts
index d8ea00c62d..a7521aebed 100644
--- a/frontend/src/i18n/locales/en/admin/overview.ts
+++ b/frontend/src/i18n/locales/en/admin/overview.ts
@@ -1011,7 +1011,7 @@ export default {
         title: 'Per-model group pricing',
         description: 'Overrides channel and built-in prices for matching models. Long-context tiers come from official presets — do not enter custom intervals. Use per-request tiers such as realtime, tts, and stt for audio.',
         longContext: 'Enable long-context tier pricing',
-        longContextHint: 'When checked, official/preset long-context tiers apply. When unchecked, token models stay on the first-tier base rate.',
+        longContextHint: 'When checked, channel intervals or official preset tiers apply. Otherwise the first tier is used unless the account explicitly enables long-context billing.',
         add: 'Add model price'
       },
       voicePricing: {
diff --git a/frontend/src/i18n/locales/zh/admin/channels.ts b/frontend/src/i18n/locales/zh/admin/channels.ts
index 60e154858b..b7beb0398f 100644
--- a/frontend/src/i18n/locales/zh/admin/channels.ts
+++ b/frontend/src/i18n/locales/zh/admin/channels.ts
@@ -70,6 +70,7 @@ export default {
         maxPositive: '区间 #{index}：最大 token 数（{value}）必须大于 0',
         maxGreaterThanMin: '区间 #{index}：最大 token 数（{max}）必须大于最小 token 数（{min}）',
         negativePrice: '区间 #{index}：{field}不能为负数',
+        multiplierPositive: '区间 #{index}：{field}必须大于 0',
         unboundedLast: '区间 #{index}：无上限区间（最大 token 数为空）必须放在最后',
         overlap: '区间 #{previousIndex} 和 #{currentIndex} 重叠：前一个上界（{previousMax}）大于当前下界（{currentMin}）',
         price: {
@@ -128,6 +129,14 @@ export default {
         imageTokenPrice: '图片输出',
         imageOutputPrice: '图片输出价格',
         pricePlaceholder: '默认',
+        fastMultiplier: 'Fast 倍率',
+        flexMultiplier: 'Flex 倍率',
+        multiplierPlaceholder: '未配置',
+        multiplierPositive: 'Fast/Flex 倍率必须大于 0',
+        inputMultiplier: '输入倍率',
+        outputMultiplier: '输出倍率',
+        cacheWriteMultiplier: '缓存写倍率',
+        cacheReadMultiplier: '缓存读倍率',
         intervals: '上下文区间定价（可选）',
         timePricing: '时间段定价（可选）',
         timezone: '时区',
diff --git a/frontend/src/i18n/locales/zh/admin/overview.ts b/frontend/src/i18n/locales/zh/admin/overview.ts
index fdfbc8fdac..00ee1fbfc1 100644
--- a/frontend/src/i18n/locales/zh/admin/overview.ts
+++ b/frontend/src/i18n/locales/zh/admin/overview.ts
@@ -1008,7 +1008,7 @@ export default {
         title: '分组逐模型定价',
         description: '匹配模型后覆盖渠道和内置价格。长上下文阶梯沿用官方/预设价卡，无需再手填区间。音频可用按次层级配置 realtime、tts、stt。',
         longContext: '启用长上下文阶梯定价',
-        longContextHint: '勾选后按官方/预设阶梯计费；关闭则始终按第一档基础价。',
+        longContextHint: '勾选后按渠道区间或官方预设阶梯计费；关闭后默认按第一档，账号显式开启时除外。',
         add: '添加模型价格'
       },
       voicePricing: {
diff --git a/frontend/src/views/admin/ChannelsView.vue b/frontend/src/views/admin/ChannelsView.vue
index 4da09f900c..fece592ad1 100644
--- a/frontend/src/views/admin/ChannelsView.vue
+++ b/frontend/src/views/admin/ChannelsView.vue
@@ -448,6 +448,7 @@
                   :entry="entry"
                   :platform="section.platform"
                   enable-time-pricing
+                  enable-tier-multipliers
                   @update="updatePricingEntry(sIdx, idx, $event)"
                   @remove="removePricingEntry(sIdx, idx)"
                 />
@@ -633,7 +634,7 @@ import { extractApiErrorMessage } from '@/utils/apiError'
 import { adminAPI } from '@/api/admin'
 import type { Channel, ChannelModelPricing, CreateChannelRequest, UpdateChannelRequest, AccountStatsPricingRule } from '@/api/admin/channels'
 import type { PricingFormEntry } from '@/components/admin/channel/types'
-import { apiIntervalsToForm, apiTimePricingToForm, createDefaultTimePricingForm, findModelConflict, formIntervalsToAPI, formTimePricingToAPI, mTokToPerToken, perTokenToMTok, validateIntervals, validateTimePricing } from '@/components/admin/channel/types'
+import { apiIntervalsToForm, apiTimePricingToForm, createDefaultTimePricingForm, findModelConflict, formIntervalsToAPI, formTimePricingToAPI, isValidPositiveMultiplier, mTokToPerToken, perTokenToMTok, validateIntervals, validateTimePricing } from '@/components/admin/channel/types'
 import type { AdminGroup, GroupPlatform } from '@/types'
 import type { Column } from '@/components/common/types'
 import { platformTextClass, platformBadgeLightClass } from '@/utils/platformColors'
@@ -861,6 +862,8 @@ function addPricingEntry(sectionIdx: number) {
     output_price: null,
     cache_write_price: null,
     cache_read_price: null,
+    fast_multiplier: null,
+    flex_multiplier: null,
     image_input_price: null,
     image_output_price: null,
     per_request_price: null,
@@ -895,6 +898,8 @@ async function syncLatestModels(sectionIdx: number) {
       output_price: null,
       cache_write_price: null,
       cache_read_price: null,
+      fast_multiplier: null,
+      flex_multiplier: null,
       image_input_price: null,
       image_output_price: null,
       per_request_price: null,
@@ -1120,6 +1125,8 @@ function formToAPI(): { group_ids: number[], model_pricing: ChannelModelPricing[
         output_price: mTokToPerToken(entry.output_price),
         cache_write_price: mTokToPerToken(entry.cache_write_price),
         cache_read_price: mTokToPerToken(entry.cache_read_price),
+        fast_multiplier: entry.fast_multiplier != null && entry.fast_multiplier !== '' ? Number(entry.fast_multiplier) : null,
+        flex_multiplier: entry.flex_multiplier != null && entry.flex_multiplier !== '' ? Number(entry.flex_multiplier) : null,
         image_input_price: mTokToPerToken(entry.image_input_price),
         image_output_price: mTokToPerToken(entry.image_output_price),
         per_request_price: entry.per_request_price != null && entry.per_request_price !== '' ? Number(entry.per_request_price) : null,
@@ -1219,6 +1226,8 @@ function apiToForm(channel: Channel): PlatformSection[] {
         output_price: perTokenToMTok(p.output_price),
         cache_write_price: perTokenToMTok(p.cache_write_price),
         cache_read_price: perTokenToMTok(p.cache_read_price),
+        fast_multiplier: p.fast_multiplier,
+        flex_multiplier: p.flex_multiplier,
         image_input_price: perTokenToMTok(p.image_input_price),
         image_output_price: perTokenToMTok(p.image_output_price),
         per_request_price: p.per_request_price,
@@ -1524,6 +1533,14 @@ async function handleSubmit() {
   // 校验区间合法性（范围、重叠等）
   for (const section of form.platforms.filter(s => s.enabled)) {
     for (const entry of section.model_pricing) {
+      if (!isValidPositiveMultiplier(entry.fast_multiplier) ||
+          !isValidPositiveMultiplier(entry.flex_multiplier)) {
+        const platformLabel = t('admin.groups.platforms.' + section.platform, section.platform)
+        const modelLabel = entry.models.join(', ') || t('admin.channels.form.unnamed')
+        appStore.showError(`${platformLabel} - ${modelLabel}: ${t('admin.channels.form.multiplierPositive')}`)
+        activeTab.value = section.platform
+        return
+      }
       if (!entry.intervals || entry.intervals.length === 0) continue
       const intervalErr = validateIntervals(entry.intervals, entry.billing_mode, t)
       if (intervalErr) {