diff --git a/backend/cmd/server/wire_gen.go b/backend/cmd/server/wire_gen.go
index 8969bf4411..bdc357d482 100644
--- a/backend/cmd/server/wire_gen.go
+++ b/backend/cmd/server/wire_gen.go
@@ -189,7 +189,7 @@ func initializeApplication(buildInfo handler.BuildInfo) (*Application, error) {
 	adminAccountRepository := repository.NewAdminAccountRepository(client, db, schedulerCache)
 	proxyExitInfoProber := repository.NewProxyExitInfoProber(configConfig)
 	proxyLatencyCache := repository.NewProxyLatencyCache(redisClient)
-	adminService := service.NewAdminService(userRepository, adminGroupRepository, adminAccountRepository, proxyRepository, apiKeyRepository, redeemCodeRepository, userGroupRateRepository, userRPMCache, billingCacheService, proxyExitInfoProber, proxyLatencyCache, apiKeyAuthCacheInvalidator, client, settingService, subscriptionService, userSubscriptionRepository, privacyClientFactory, openAIGatewayService, affiliateService, compositeModelRouteRepository, compositeRouteResolver)
+	adminService := service.NewAdminService(userRepository, adminGroupRepository, adminAccountRepository, proxyRepository, apiKeyRepository, redeemCodeRepository, userGroupRateRepository, userRPMCache, billingCacheService, proxyExitInfoProber, proxyLatencyCache, apiKeyAuthCacheInvalidator, client, settingService, subscriptionService, userSubscriptionRepository, privacyClientFactory, openAIGatewayService, affiliateService, compositeModelRouteRepository, compositeRouteResolver, channelService)
 	adminUserHandler := admin.NewUserHandler(adminService, concurrencyService, serviceUserPlatformQuotaRepository, billingCache, totpService, userService, settingService)
 	groupCapacityService := service.NewGroupCapacityService(accountRepository, groupRepository, concurrencyService, sessionLimitCache, rpmCache)
 	groupHandler := admin.NewGroupHandler(adminService, dashboardService, groupCapacityService)
diff --git a/backend/internal/server/api_contract_test.go b/backend/internal/server/api_contract_test.go
index 91bdd6a360..79dfb919a6 100644
--- a/backend/internal/server/api_contract_test.go
+++ b/backend/internal/server/api_contract_test.go
@@ -1468,7 +1468,7 @@ func newContractDeps(t *testing.T) *contractDeps {
 	settingRepo := newStubSettingRepo()
 	settingService := service.NewSettingService(settingRepo, cfg)
 
-	adminService := service.NewAdminService(userRepo, groupRepo, &accountRepo, proxyRepo, apiKeyRepo, redeemRepo, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil)
+	adminService := service.NewAdminService(userRepo, groupRepo, &accountRepo, proxyRepo, apiKeyRepo, redeemRepo, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil)
 	authHandler := handler.NewAuthHandler(cfg, nil, userService, settingService, nil, redeemService, nil, nil)
 	apiKeyHandler := handler.NewAPIKeyHandler(apiKeyService)
 	usageHandler := handler.NewUsageHandler(usageService, apiKeyService, nil, nil)
diff --git a/backend/internal/service/admin_group.go b/backend/internal/service/admin_group.go
index 98f4ab6d31..ac6259509d 100644
--- a/backend/internal/service/admin_group.go
+++ b/backend/internal/service/admin_group.go
@@ -641,6 +641,9 @@ func (s *adminServiceImpl) UpdateGroup(ctx context.Context, id int64, input *Upd
 		return nil, err
 	}
 
+	// 渠道缓存里存了 groupID → platform 的映射，改了平台要让它失效（见函数末尾）
+	previousPlatform := group.Platform
+
 	if input.Name != "" {
 		group.Name = input.Name
 	}
@@ -900,6 +903,13 @@ func (s *adminServiceImpl) UpdateGroup(ctx context.Context, id int64, input *Upd
 		s.authCacheInvalidator.InvalidateAuthCacheByGroupID(ctx, id)
 	}
 
+	// 平台变了就失效渠道缓存：该缓存持有 groupID → platform，而渠道定价 / 模型映射 /
+	// 模型白名单都按平台严格隔离。不失效的话，缓存最长 10 分钟仍按旧平台匹配，
+	// 期间定价查不到会静默回落到 LiteLLM 价格表、映射与白名单也不生效。
+	if group.Platform != previousPlatform && s.channelCacheInvalidator != nil {
+		s.channelCacheInvalidator.InvalidateCache()
+	}
+
 	// 如果指定了复制账号的源分组，同步绑定（替换当前分组的账号）
 	if len(input.CopyAccountsFromGroupIDs) > 0 {
 		// 去重源分组 IDs
diff --git a/backend/internal/service/admin_group_platform_cache_test.go b/backend/internal/service/admin_group_platform_cache_test.go
new file mode 100644
index 0000000000..d0f0ac752c
--- /dev/null
+++ b/backend/internal/service/admin_group_platform_cache_test.go
@@ -0,0 +1,87 @@
+//go:build unit
+
+package service
+
+import (
+	"context"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+// groupPlatformRepoStub 只实现 UpdateGroup 走到的两个方法，其余靠内嵌接口占位。
+type groupPlatformRepoStub struct {
+	GroupRepository
+	group   *Group
+	updated *Group
+}
+
+func (r *groupPlatformRepoStub) GetByID(_ context.Context, _ int64) (*Group, error) {
+	cloned := *r.group
+	return &cloned, nil
+}
+
+func (r *groupPlatformRepoStub) Update(_ context.Context, group *Group) error {
+	r.updated = group
+	return nil
+}
+
+type channelCacheInvalidatorSpy struct {
+	calls int
+}
+
+func (s *channelCacheInvalidatorSpy) InvalidateCache() { s.calls++ }
+
+// 渠道缓存持有 groupID → platform，而渠道定价/模型映射/模型白名单都按平台严格隔离。
+// 改了分组平台却不失效缓存，最长 10 分钟内这些查找仍按旧平台匹配（静默走错价）。
+func TestUpdateGroupInvalidatesChannelCacheOnPlatformChange(t *testing.T) {
+	tests := []struct {
+		name          string
+		fromPlatform  string
+		inputPlatform string
+		wantCalls     int
+	}{
+		{
+			name:          "platform changed invalidates",
+			fromPlatform:  PlatformAnthropic,
+			inputPlatform: PlatformOpenAI,
+			wantCalls:     1,
+		},
+		{
+			name:          "same platform does not invalidate",
+			fromPlatform:  PlatformAnthropic,
+			inputPlatform: PlatformAnthropic,
+			wantCalls:     0,
+		},
+		{
+			// 请求里不带 platform 字段时不应该动缓存
+			name:          "platform omitted does not invalidate",
+			fromPlatform:  PlatformAnthropic,
+			inputPlatform: "",
+			wantCalls:     0,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			repo := &groupPlatformRepoStub{group: &Group{ID: 7, Name: "g", Platform: tt.fromPlatform}}
+			spy := &channelCacheInvalidatorSpy{}
+			svc := &adminServiceImpl{groupRepo: repo, channelCacheInvalidator: spy}
+
+			got, err := svc.UpdateGroup(context.Background(), 7, &UpdateGroupInput{Platform: tt.inputPlatform})
+			require.NoError(t, err)
+			require.NotNil(t, got)
+			require.Equal(t, tt.wantCalls, spy.calls)
+		})
+	}
+}
+
+// 依赖可以不注入（例如测试或裁剪构建），此时不应 panic——缓存靠 TTL 自然重建。
+func TestUpdateGroupWithoutChannelCacheInvalidator(t *testing.T) {
+	repo := &groupPlatformRepoStub{group: &Group{ID: 7, Name: "g", Platform: PlatformAnthropic}}
+	svc := &adminServiceImpl{groupRepo: repo}
+
+	got, err := svc.UpdateGroup(context.Background(), 7, &UpdateGroupInput{Platform: PlatformOpenAI})
+	require.NoError(t, err)
+	require.Equal(t, PlatformOpenAI, got.Platform)
+}
diff --git a/backend/internal/service/admin_service.go b/backend/internal/service/admin_service.go
index 31d0e48649..3030b945b9 100644
--- a/backend/internal/service/admin_service.go
+++ b/backend/internal/service/admin_service.go
@@ -666,6 +666,14 @@ type adminServiceImpl struct {
 	affiliateService     adminRechargeAffiliateAccruer
 	compositeRouteRepo   CompositeModelRouteRepository
 	compositeResolver    *CompositeRouteResolver
+	// 分组平台变更后用来失效渠道缓存；可为 nil（缓存会在 TTL 到期后自然重建）
+	channelCacheInvalidator ChannelCacheInvalidator
+}
+
+// ChannelCacheInvalidator 失效渠道缓存。
+// 窄接口，避免 admin 服务依赖整个 ChannelService——与 APIKeyAuthCacheInvalidator 同一思路。
+type ChannelCacheInvalidator interface {
+	InvalidateCache()
 }
 
 type adminRechargeAffiliateAccruer interface {
@@ -699,6 +707,7 @@ func NewAdminService(
 	affiliateService *AffiliateService,
 	compositeRouteRepo CompositeModelRouteRepository,
 	compositeResolver *CompositeRouteResolver,
+	channelCacheInvalidator ChannelCacheInvalidator,
 ) AdminService {
 	return &adminServiceImpl{
 		userRepo:             userRepo,
@@ -725,5 +734,7 @@ func NewAdminService(
 		affiliateService:     affiliateService,
 		compositeRouteRepo:   compositeRouteRepo,
 		compositeResolver:    compositeResolver,
+
+		channelCacheInvalidator: channelCacheInvalidator,
 	}
 }
diff --git a/backend/internal/service/channel_service.go b/backend/internal/service/channel_service.go
index 744b8f43d7..3a8c5556ad 100644
--- a/backend/internal/service/channel_service.go
+++ b/backend/internal/service/channel_service.go
@@ -375,6 +375,13 @@ func channelLookupPlatform(ctx context.Context, groupPlatform string) string {
 	}
 	return groupPlatform
 }
+
+// InvalidateCache 失效并重建渠道缓存。
+// 供渠道以外、但会影响渠道缓存内容的变更调用（如分组平台变更）。
+func (s *ChannelService) InvalidateCache() {
+	s.invalidateCache()
+}
+
 func (s *ChannelService) invalidateCache() {
 	s.cache.Store((*channelCache)(nil))
 	s.cacheSF.Forget("channel_cache")
diff --git a/backend/internal/service/wire.go b/backend/internal/service/wire.go
index 93555730a7..b70b27d9de 100644
--- a/backend/internal/service/wire.go
+++ b/backend/internal/service/wire.go
@@ -852,6 +852,7 @@ var ProviderSet = wire.NewSet(
 	ProvideScheduledTestRunnerService,
 	NewGroupCapacityService,
 	NewChannelService,
+	wire.Bind(new(ChannelCacheInvalidator), new(*ChannelService)),
 	NewModelPricingResolver,
 	NewContentModerationService,
 	NewAffiliateService,