diff --git a/backend/internal/service/account_usage_service.go b/backend/internal/service/account_usage_service.go
index 3c50baaec2..d9f6200359 100644
--- a/backend/internal/service/account_usage_service.go
+++ b/backend/internal/service/account_usage_service.go
@@ -184,6 +184,7 @@ type UsageInfo struct {
 	FiveHour           *UsageProgress `json:"five_hour"`                      // 5小时窗口
 	SevenDay           *UsageProgress `json:"seven_day,omitempty"`            // 7天窗口
 	SevenDaySonnet     *UsageProgress `json:"seven_day_sonnet,omitempty"`     // 7天Sonnet窗口
+	SevenDayFable      *UsageProgress `json:"seven_day_fable,omitempty"`      // 7天Fable窗口（响应头 7d_oi）
 	GeminiSharedDaily  *UsageProgress `json:"gemini_shared_daily,omitempty"`  // Gemini shared pool RPD (Google One / Code Assist)
 	GeminiProDaily     *UsageProgress `json:"gemini_pro_daily,omitempty"`     // Gemini Pro 日配额
 	GeminiFlashDaily   *UsageProgress `json:"gemini_flash_daily,omitempty"`   // Gemini Flash 日配额
@@ -236,6 +237,12 @@ type UsageInfo struct {
 	Error string `json:"error,omitempty"`
 }
 
+// ClaudeUsageWindow Anthropic /api/oauth/usage 返回的单个用量窗口
+type ClaudeUsageWindow struct {
+	Utilization float64 `json:"utilization"`
+	ResetsAt    string  `json:"resets_at"`
+}
+
 // ClaudeUsageResponse Anthropic API返回的usage结构
 type ClaudeUsageResponse struct {
 	FiveHour struct {
@@ -250,6 +257,10 @@ type ClaudeUsageResponse struct {
 		Utilization float64 `json:"utilization"`
 		ResetsAt    string  `json:"resets_at"`
 	} `json:"seven_day_sonnet"`
+	// Fable 专属 7d 窗口（对应响应头 7d_oi，claim 名为 seven_day_overage_included，
+	// 见 anthropic-ratelimit-unified-representative-claim 头）。上游 usage API
+	// 若不下发该字段，GetUsage 会用被动采样数据回填。
+	SevenDayOverageIncluded ClaudeUsageWindow `json:"seven_day_overage_included"`
 }
 
 // ClaudeUsageFetchOptions 包含获取 Claude 用量数据所需的所有选项
@@ -429,6 +440,12 @@ func (s *AccountUsageService) GetUsage(ctx context.Context, accountID int64, for
 		// 5. 将主动查询结果同步到被动缓存，下次 passive 加载即为最新值
 		s.syncActiveToPassive(ctx, account.ID, usage)
 
+		// 6. 上游 usage API 目前不一定下发 Fable 7d 窗口；缺失时回填被动采样
+		// （7d_oi 响应头）的数据，避免主动查询后 7d F 进度条丢失。
+		if usage.SevenDayFable == nil {
+			usage.SevenDayFable = buildPassiveUsageWindow(account.Extra, "passive_usage_7d_oi_utilization", "passive_usage_7d_oi_reset")
+		}
+
 		s.tryClearRecoverableAccountError(ctx, account)
 		return usage, nil
 	}
@@ -471,25 +488,10 @@ func (s *AccountUsageService) GetPassiveUsage(ctx context.Context, accountID int
 	}
 
 	// 构建 7d 窗口（从被动采样数据）
-	util7d := parseExtraFloat64(account.Extra["passive_usage_7d_utilization"])
-	reset7dRaw := parseExtraFloat64(account.Extra["passive_usage_7d_reset"])
-	if util7d > 0 || reset7dRaw > 0 {
-		var resetAt *time.Time
-		var remaining int
-		if reset7dRaw > 0 {
-			t := time.Unix(int64(reset7dRaw), 0)
-			resetAt = &t
-			remaining = int(time.Until(t).Seconds())
-			if remaining < 0 {
-				remaining = 0
-			}
-		}
-		info.SevenDay = &UsageProgress{
-			Utilization:      util7d * 100,
-			ResetsAt:         resetAt,
-			RemainingSeconds: remaining,
-		}
-	}
+	info.SevenDay = buildPassiveUsageWindow(account.Extra, "passive_usage_7d_utilization", "passive_usage_7d_reset")
+
+	// 构建 7d Fable 窗口（从被动采样的 7d_oi 响应头数据）
+	info.SevenDayFable = buildPassiveUsageWindow(account.Extra, "passive_usage_7d_oi_utilization", "passive_usage_7d_oi_reset")
 
 	// 添加窗口统计
 	s.addWindowStats(ctx, account, info)
@@ -497,6 +499,31 @@ func (s *AccountUsageService) GetPassiveUsage(ctx context.Context, accountID int
 	return info, nil
 }
 
+// buildPassiveUsageWindow 从 Extra 中的被动采样数据（utilization 为 0-1 小数、reset 为 Unix 秒）
+// 构建用量窗口，无数据时返回 nil。
+func buildPassiveUsageWindow(extra map[string]any, utilKey, resetKey string) *UsageProgress {
+	util := parseExtraFloat64(extra[utilKey])
+	resetRaw := parseExtraFloat64(extra[resetKey])
+	if util <= 0 && resetRaw <= 0 {
+		return nil
+	}
+	var resetAt *time.Time
+	var remaining int
+	if resetRaw > 0 {
+		t := time.Unix(int64(resetRaw), 0)
+		resetAt = &t
+		remaining = int(time.Until(t).Seconds())
+		if remaining < 0 {
+			remaining = 0
+		}
+	}
+	return &UsageProgress{
+		Utilization:      util * 100,
+		ResetsAt:         resetAt,
+		RemainingSeconds: remaining,
+	}
+}
+
 // syncActiveToPassive 将主动查询的最新数据回写到 Extra 被动缓存，
 // 这样下次被动加载时能看到最新值。
 func (s *AccountUsageService) syncActiveToPassive(ctx context.Context, accountID int64, usage *UsageInfo) {
@@ -511,6 +538,12 @@ func (s *AccountUsageService) syncActiveToPassive(ctx context.Context, accountID
 			extraUpdates["passive_usage_7d_reset"] = usage.SevenDay.ResetsAt.Unix()
 		}
 	}
+	if usage.SevenDayFable != nil {
+		extraUpdates["passive_usage_7d_oi_utilization"] = usage.SevenDayFable.Utilization / 100
+		if usage.SevenDayFable.ResetsAt != nil {
+			extraUpdates["passive_usage_7d_oi_reset"] = usage.SevenDayFable.ResetsAt.Unix()
+		}
+	}
 
 	if len(extraUpdates) > 0 {
 		extraUpdates["passive_usage_sampled_at"] = time.Now().UTC().Format(time.RFC3339)
@@ -1010,8 +1043,8 @@ func enrichUsageWithAccountError(info *UsageInfo, account *Account) {
 // 使用独立缓存（1 分钟），与 API 缓存分离
 func (s *AccountUsageService) addWindowStats(ctx context.Context, account *Account, usage *UsageInfo) {
 	// 修复：即使 FiveHour 为 nil，也要尝试获取统计数据
-	// 因为 SevenDay/SevenDaySonnet 可能需要
-	if usage.FiveHour == nil && usage.SevenDay == nil && usage.SevenDaySonnet == nil {
+	// 因为 SevenDay/SevenDaySonnet/SevenDayFable 可能需要
+	if usage.FiveHour == nil && usage.SevenDay == nil && usage.SevenDaySonnet == nil && usage.SevenDayFable == nil {
 		return
 	}
 
@@ -1347,6 +1380,22 @@ func (s *AccountUsageService) buildUsageInfo(resp *ClaudeUsageResponse, updatedA
 		}
 	}
 
+	// 7天Fable窗口（响应头 7d_oi 对应的窗口）
+	if fable := resp.SevenDayOverageIncluded; fable.ResetsAt != "" {
+		if fableReset, err := parseTime(fable.ResetsAt); err == nil {
+			info.SevenDayFable = &UsageProgress{
+				Utilization:      fable.Utilization,
+				ResetsAt:         &fableReset,
+				RemainingSeconds: int(time.Until(fableReset).Seconds()),
+			}
+		} else {
+			log.Printf("Failed to parse SevenDayFable.ResetsAt: %s, error: %v", fable.ResetsAt, err)
+			info.SevenDayFable = &UsageProgress{
+				Utilization: fable.Utilization,
+			}
+		}
+	}
+
 	return info
 }
 
diff --git a/backend/internal/service/account_usage_service_fable_test.go b/backend/internal/service/account_usage_service_fable_test.go
new file mode 100644
index 0000000000..60f2e9c79f
--- /dev/null
+++ b/backend/internal/service/account_usage_service_fable_test.go
@@ -0,0 +1,119 @@
+package service
+
+import (
+	"encoding/json"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestClaudeUsageResponse_FableWindowDecoding(t *testing.T) {
+	t.Run("seven_day_overage_included", func(t *testing.T) {
+		raw := `{
+  "five_hour": {"utilization": 12.0, "resets_at": "2026-07-03T10:00:00Z"},
+  "seven_day": {"utilization": 34.0, "resets_at": "2026-07-08T00:00:00Z"},
+  "seven_day_overage_included": {"utilization": 56.0, "resets_at": "2026-07-08T03:00:00Z"}
+}`
+		var resp ClaudeUsageResponse
+		require.NoError(t, json.Unmarshal([]byte(raw), &resp))
+		require.Equal(t, 56.0, resp.SevenDayOverageIncluded.Utilization)
+		require.Equal(t, "2026-07-08T03:00:00Z", resp.SevenDayOverageIncluded.ResetsAt)
+	})
+
+	t.Run("absent", func(t *testing.T) {
+		raw := `{"five_hour": {"utilization": 12.0, "resets_at": "2026-07-03T10:00:00Z"}}`
+		var resp ClaudeUsageResponse
+		require.NoError(t, json.Unmarshal([]byte(raw), &resp))
+		require.Zero(t, resp.SevenDayOverageIncluded.Utilization)
+		require.Empty(t, resp.SevenDayOverageIncluded.ResetsAt)
+	})
+}
+
+func TestBuildUsageInfo_SevenDayFable(t *testing.T) {
+	svc := &AccountUsageService{}
+	now := time.Now()
+
+	resetAt := now.Add(72 * time.Hour).UTC().Truncate(time.Second)
+	var resp ClaudeUsageResponse
+	resp.FiveHour.Utilization = 10
+	resp.SevenDayOverageIncluded = ClaudeUsageWindow{
+		Utilization: 88,
+		ResetsAt:    resetAt.Format(time.RFC3339),
+	}
+
+	info := svc.buildUsageInfo(&resp, &now)
+	require.NotNil(t, info.SevenDayFable)
+	require.Equal(t, 88.0, info.SevenDayFable.Utilization)
+	require.NotNil(t, info.SevenDayFable.ResetsAt)
+	require.True(t, info.SevenDayFable.ResetsAt.Equal(resetAt))
+	require.Greater(t, info.SevenDayFable.RemainingSeconds, 0)
+
+	// 无 Fable 数据时不应创建窗口
+	var empty ClaudeUsageResponse
+	empty.FiveHour.Utilization = 10
+	info = svc.buildUsageInfo(&empty, &now)
+	require.Nil(t, info.SevenDayFable)
+}
+
+func TestBuildPassiveUsageWindow(t *testing.T) {
+	future := time.Now().Add(48 * time.Hour).Unix()
+
+	t.Run("utilization and reset", func(t *testing.T) {
+		window := buildPassiveUsageWindow(map[string]any{
+			"passive_usage_7d_oi_utilization": 0.87,
+			"passive_usage_7d_oi_reset":       float64(future),
+		}, "passive_usage_7d_oi_utilization", "passive_usage_7d_oi_reset")
+		require.NotNil(t, window)
+		require.InDelta(t, 87.0, window.Utilization, 1e-9)
+		require.NotNil(t, window.ResetsAt)
+		require.Equal(t, future, window.ResetsAt.Unix())
+		require.Greater(t, window.RemainingSeconds, 0)
+	})
+
+	t.Run("no data returns nil", func(t *testing.T) {
+		require.Nil(t, buildPassiveUsageWindow(nil, "u", "r"))
+		require.Nil(t, buildPassiveUsageWindow(map[string]any{}, "u", "r"))
+	})
+
+	t.Run("expired reset clamps remaining to zero", func(t *testing.T) {
+		past := time.Now().Add(-time.Hour).Unix()
+		window := buildPassiveUsageWindow(map[string]any{
+			"u": 0.5,
+			"r": float64(past),
+		}, "u", "r")
+		require.NotNil(t, window)
+		require.Equal(t, 0, window.RemainingSeconds)
+	})
+
+	t.Run("utilization only", func(t *testing.T) {
+		window := buildPassiveUsageWindow(map[string]any{"u": 0.25}, "u", "r")
+		require.NotNil(t, window)
+		require.InDelta(t, 25.0, window.Utilization, 1e-9)
+		require.Nil(t, window.ResetsAt)
+	})
+}
+
+func TestSyncActiveToPassive_WritesFableExtras(t *testing.T) {
+	repo := &accountUsageCodexProbeRepo{updateExtraCh: make(chan map[string]any, 1)}
+	svc := &AccountUsageService{accountRepo: repo}
+
+	resetAt := time.Now().Add(72 * time.Hour).Truncate(time.Second)
+	usage := &UsageInfo{
+		SevenDayFable: &UsageProgress{
+			Utilization: 87,
+			ResetsAt:    &resetAt,
+		},
+	}
+
+	svc.syncActiveToPassive(t.Context(), 1, usage)
+
+	select {
+	case updates := <-repo.updateExtraCh:
+		require.InDelta(t, 0.87, updates["passive_usage_7d_oi_utilization"], 1e-9)
+		require.Equal(t, resetAt.Unix(), updates["passive_usage_7d_oi_reset"])
+		require.Contains(t, updates, "passive_usage_sampled_at")
+	default:
+		t.Fatal("expected UpdateExtra to be called with fable extras")
+	}
+}
diff --git a/backend/internal/service/model_rate_limit.go b/backend/internal/service/model_rate_limit.go
index 1568a00f78..195f5a1dfd 100644
--- a/backend/internal/service/model_rate_limit.go
+++ b/backend/internal/service/model_rate_limit.go
@@ -12,6 +12,9 @@ const (
 	modelRateLimitsKey                 = "model_rate_limits"
 	antigravityGeminiModelRateLimitKey = "antigravity:gemini"
 	openAIImageGenerationRateLimitKey  = "openai:image_generation"
+	// anthropicFableRateLimitKey 是 Anthropic 7d_oi（Fable 专属 7d 窗口）限流的
+	// 家族级 scope：命中后所有 Fable 变体（含 [1m] 等后缀）都不再调度到该账号。
+	anthropicFableRateLimitKey = "claude-fable-5"
 )
 
 // isRateLimitActiveForKey 检查指定 key 的限流是否生效
@@ -82,10 +85,19 @@ func (a *Account) modelRateLimitKeysForRequest(ctx context.Context, requestedMod
 		if openAIImageGenerationRateLimitApplies(ctx, requestedModel, modelKey) && modelKey != openAIImageGenerationRateLimitKey {
 			keys = append(keys, openAIImageGenerationRateLimitKey)
 		}
+	case PlatformAnthropic:
+		if isAnthropicFableModel(modelKey) && modelKey != anthropicFableRateLimitKey {
+			keys = append(keys, anthropicFableRateLimitKey)
+		}
 	}
 	return keys
 }
 
+// isAnthropicFableModel 判断是否为 Fable 模型家族（claude-fable-5、claude-fable-5[1m] 等变体）
+func isAnthropicFableModel(model string) bool {
+	return strings.Contains(strings.ToLower(model), "fable")
+}
+
 func openAIImageGenerationRateLimitApplies(ctx context.Context, requestedModel, modelKey string) bool {
 	if isOpenAIImageGenerationModel(requestedModel) || isOpenAIImageGenerationModel(modelKey) {
 		return true
diff --git a/backend/internal/service/model_rate_limit_test.go b/backend/internal/service/model_rate_limit_test.go
index c62e4c4b9b..430d91baf6 100644
--- a/backend/internal/service/model_rate_limit_test.go
+++ b/backend/internal/service/model_rate_limit_test.go
@@ -499,3 +499,47 @@ func TestGetRateLimitRemainingTime(t *testing.T) {
 		})
 	}
 }
+
+func TestIsModelRateLimited_AnthropicFableFamilyKey(t *testing.T) {
+	now := time.Now()
+	future := now.Add(48 * time.Hour).Format(time.RFC3339)
+
+	account := &Account{
+		Platform: PlatformAnthropic,
+		Extra: map[string]any{
+			modelRateLimitsKey: map[string]any{
+				anthropicFableRateLimitKey: map[string]any{
+					"rate_limit_reset_at": future,
+				},
+			},
+		},
+	}
+
+	tests := []struct {
+		requestedModel string
+		expected       bool
+	}{
+		{"claude-fable-5", true},
+		{"claude-fable-5[1m]", true},      // 家族 key 覆盖变体
+		{"Claude-Fable-5-20260601", true}, // 大小写不敏感
+		{"claude-sonnet-4-6", false},      // 其他模型不受影响
+		{"claude-opus-4-8", false},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.requestedModel, func(t *testing.T) {
+			got := account.isModelRateLimitedWithContext(context.Background(), tc.requestedModel)
+			require.Equal(t, tc.expected, got)
+			remaining := account.GetModelRateLimitRemainingTimeWithContext(context.Background(), tc.requestedModel)
+			require.Equal(t, tc.expected, remaining > 0)
+		})
+	}
+}
+
+func TestIsAnthropicFableModel(t *testing.T) {
+	require.True(t, isAnthropicFableModel("claude-fable-5"))
+	require.True(t, isAnthropicFableModel("claude-fable-5[1m]"))
+	require.True(t, isAnthropicFableModel("Claude-Fable-5"))
+	require.False(t, isAnthropicFableModel("claude-sonnet-4-6"))
+	require.False(t, isAnthropicFableModel(""))
+}
diff --git a/backend/internal/service/ratelimit_service.go b/backend/internal/service/ratelimit_service.go
index 9e968853f4..2b9c85a2fa 100644
--- a/backend/internal/service/ratelimit_service.go
+++ b/backend/internal/service/ratelimit_service.go
@@ -186,9 +186,14 @@ func (s *RateLimitService) HandleUpstreamError(ctx context.Context, account *Acc
 	// otherwise a broad "rate limit" keyword rule can shorten a multi-hour
 	// cooldown to a local temporary pause.
 	if statusCode == http.StatusTooManyRequests && account.Platform == PlatformAnthropic {
+		// 7d_oi 是 Fable 模型专属的 7d 窗口：只标记模型级限流，账号对其他模型仍可调度。
+		fableLimited := s.persistAnthropicFableWindowLimit(ctx, account, headers)
 		if s.persistAnthropicExhaustedWindowLimit(ctx, account, headers) {
 			return false
 		}
+		if fableLimited {
+			return false
+		}
 	}
 
 	// 先尝试临时不可调度规则（401除外）
@@ -1140,11 +1145,25 @@ func selectAnthropicExhaustedWindow(headers http.Header, now time.Time) *anthrop
 }
 
 func isAnthropic5hRejected(headers http.Header) bool {
-	return strings.EqualFold(strings.TrimSpace(headers.Get("anthropic-ratelimit-unified-5h-status")), "rejected")
+	return isAnthropicWindowRejected(headers, "5h")
+}
+
+func isAnthropicWindowRejected(headers http.Header, window string) bool {
+	return strings.EqualFold(strings.TrimSpace(headers.Get("anthropic-ratelimit-unified-"+window+"-status")), "rejected")
 }
 
 func parseAnthropicWindowReset(headers http.Header, window string, now time.Time) (time.Time, bool) {
-	raw := strings.TrimSpace(headers.Get("anthropic-ratelimit-unified-" + window + "-reset"))
+	maxAge := 8 * 24 * time.Hour
+	if window == "5h" {
+		maxAge = 6 * time.Hour
+	}
+	return parseAnthropicResetTimestamp(headers.Get("anthropic-ratelimit-unified-"+window+"-reset"), now, maxAge)
+}
+
+// parseAnthropicResetTimestamp 解析 Anthropic reset 头的 Unix 时间戳（自动识别毫秒），
+// 并校验落在 (now, now+maxAge] 的合理区间内。
+func parseAnthropicResetTimestamp(raw string, now time.Time, maxAge time.Duration) (time.Time, bool) {
+	raw = strings.TrimSpace(raw)
 	if raw == "" {
 		return time.Time{}, false
 	}
@@ -1156,15 +1175,7 @@ func parseAnthropicWindowReset(headers http.Header, window string, now time.Time
 		ts = ts / 1000
 	}
 	resetAt := time.Unix(ts, 0)
-	if !resetAt.After(now) {
-		return time.Time{}, false
-	}
-
-	maxAge := 8 * 24 * time.Hour
-	if window == "5h" {
-		maxAge = 6 * time.Hour
-	}
-	if resetAt.After(now.Add(maxAge)) {
+	if !resetAt.After(now) || resetAt.After(now.Add(maxAge)) {
 		return time.Time{}, false
 	}
 	return resetAt, true
@@ -1218,6 +1229,76 @@ func (s *RateLimitService) persistAnthropicExhaustedWindowLimit(ctx context.Cont
 	return true
 }
 
+const anthropicFableWindowReason = "anthropic_7d_oi_window_exhausted"
+
+// selectAnthropicFableWindowLimit parses the Anthropic 7d_oi per-model window
+// headers (the Fable-only 7d window, e.g. anthropic-ratelimit-unified-7d_oi-*).
+// Unlike 5h/7d, exhaustion of this window only limits the Fable model family —
+// the account must stay schedulable for other models.
+//
+// The 7d_oi surpassed-threshold header carries a float ("1.0") rather than
+// "true", so exhaustion is detected via status=rejected or utilization >= 1.0.
+// When the 7d_oi reset header is missing, the aggregated
+// anthropic-ratelimit-unified-reset is used (it mirrors the binding claim's
+// reset when 7d_oi is the representative claim).
+func selectAnthropicFableWindowLimit(headers http.Header, now time.Time) *anthropicWindowLimit {
+	if !isAnthropicWindowRejected(headers, "7d_oi") && !isAnthropicWindowExceeded(headers, "7d_oi") {
+		return nil
+	}
+	resetAt, ok := parseAnthropicWindowReset(headers, "7d_oi", now)
+	if !ok {
+		resetAt, ok = parseAnthropicAggregateReset(headers, now)
+	}
+	if !ok {
+		return nil
+	}
+	return &anthropicWindowLimit{
+		window:  "7d_oi",
+		resetAt: resetAt,
+		reason:  anthropicFableWindowReason,
+	}
+}
+
+// parseAnthropicAggregateReset parses the aggregated
+// anthropic-ratelimit-unified-reset header with the same sanity checks as the
+// per-window variant (7d scale).
+func parseAnthropicAggregateReset(headers http.Header, now time.Time) (time.Time, bool) {
+	return parseAnthropicResetTimestamp(headers.Get("anthropic-ratelimit-unified-reset"), now, 8*24*time.Hour)
+}
+
+// persistAnthropicFableWindowLimit marks the Fable model family as rate limited
+// when the 7d_oi window is exhausted. Returns true when the 7d_oi window was the
+// (or a) trigger of this 429, so the caller must not fall through to logic that
+// would mark the whole account as rate limited.
+func (s *RateLimitService) persistAnthropicFableWindowLimit(ctx context.Context, account *Account, headers http.Header) bool {
+	if s == nil || s.accountRepo == nil || account == nil {
+		return false
+	}
+	now := time.Now()
+	limit := selectAnthropicFableWindowLimit(headers, now)
+	if limit == nil {
+		return false
+	}
+	// 429 响应头本身携带最新的窗口用量（7d_oi utilization=1.0）。限流期内
+	// Fable 请求不再调度到该账号，若不在此处采样，7d F 进度条会冻结在
+	// 限流前的旧值直到窗口重置。
+	s.samplePassiveUsageFromHeaders(ctx, account, headers)
+	if err := s.accountRepo.SetModelRateLimit(ctx, account.ID, anthropicFableRateLimitKey, limit.resetAt, limit.reason); err != nil {
+		slog.Warn("anthropic_fable_window_rate_limit_set_failed",
+			"account_id", account.ID,
+			"scope", anthropicFableRateLimitKey,
+			"reset_at", limit.resetAt,
+			"error", err)
+		return true
+	}
+	slog.Info("anthropic_fable_window_model_rate_limited",
+		"account_id", account.ID,
+		"scope", anthropicFableRateLimitKey,
+		"reset_at", limit.resetAt,
+		"reset_in", time.Until(limit.resetAt).Truncate(time.Second))
+	return true
+}
+
 // calculateAnthropic429ResetTime parses Anthropic's per-window rate-limit headers
 // to determine which window (5h or 7d) actually triggered the 429.
 //
@@ -1541,10 +1622,12 @@ func (s *RateLimitService) UpdateSessionWindow(ctx context.Context, account *Acc
 	// 窗口重置时清除旧的 utilization 和被动采样数据，避免残留上个窗口的数据
 	if windowEnd != nil && needInitWindow {
 		_ = s.accountRepo.UpdateExtra(ctx, account.ID, map[string]any{
-			"session_window_utilization":   nil,
-			"passive_usage_7d_utilization": nil,
-			"passive_usage_7d_reset":       nil,
-			"passive_usage_sampled_at":     nil,
+			"session_window_utilization":      nil,
+			"passive_usage_7d_utilization":    nil,
+			"passive_usage_7d_reset":          nil,
+			"passive_usage_7d_oi_utilization": nil,
+			"passive_usage_7d_oi_reset":       nil,
+			"passive_usage_sampled_at":        nil,
 		})
 	}
 
@@ -1552,8 +1635,21 @@ func (s *RateLimitService) UpdateSessionWindow(ctx context.Context, account *Acc
 		slog.Warn("session_window_update_failed", "account_id", account.ID, "error", err)
 	}
 
-	// 被动采样：从响应头收集 5h + 7d utilization，合并为一次 DB 写入
-	extraUpdates := make(map[string]any, 4)
+	// 被动采样：从响应头收集 5h + 7d + 7d_oi utilization，合并为一次 DB 写入
+	s.samplePassiveUsageFromHeaders(ctx, account, headers)
+
+	// 如果状态为allowed且之前有限流，说明窗口已重置，清除限流状态
+	if status == "allowed" && account.IsRateLimited() {
+		if err := s.ClearRateLimit(ctx, account.ID); err != nil {
+			slog.Warn("rate_limit_clear_failed", "account_id", account.ID, "error", err)
+		}
+	}
+}
+
+// samplePassiveUsageFromHeaders 从 Anthropic 响应头收集 5h/7d/7d_oi 的
+// utilization 与 reset 被动采样数据，合并为一次 Extra 写入。无数据时不写。
+func (s *RateLimitService) samplePassiveUsageFromHeaders(ctx context.Context, account *Account, headers http.Header) {
+	extraUpdates := make(map[string]any, 6)
 	// 5h utilization（0-1 小数），供 estimateSetupTokenUsage 使用
 	if utilStr := headers.Get("anthropic-ratelimit-unified-5h-utilization"); utilStr != "" {
 		if util, err := strconv.ParseFloat(utilStr, 64); err == nil {
@@ -1575,19 +1671,27 @@ func (s *RateLimitService) UpdateSessionWindow(ctx context.Context, account *Acc
 			extraUpdates["passive_usage_7d_reset"] = ts
 		}
 	}
+	// 7d_oi (Fable 专属 7d 窗口) utilization（0-1 小数）
+	if utilStr := headers.Get("anthropic-ratelimit-unified-7d_oi-utilization"); utilStr != "" {
+		if util, err := strconv.ParseFloat(utilStr, 64); err == nil {
+			extraUpdates["passive_usage_7d_oi_utilization"] = util
+		}
+	}
+	// 7d_oi reset timestamp
+	if resetStr := headers.Get("anthropic-ratelimit-unified-7d_oi-reset"); resetStr != "" {
+		if ts, err := strconv.ParseInt(resetStr, 10, 64); err == nil {
+			if ts > 1e11 {
+				ts = ts / 1000
+			}
+			extraUpdates["passive_usage_7d_oi_reset"] = ts
+		}
+	}
 	if len(extraUpdates) > 0 {
 		extraUpdates["passive_usage_sampled_at"] = time.Now().UTC().Format(time.RFC3339)
 		if err := s.accountRepo.UpdateExtra(ctx, account.ID, extraUpdates); err != nil {
 			slog.Warn("passive_usage_update_failed", "account_id", account.ID, "error", err)
 		}
 	}
-
-	// 如果状态为allowed且之前有限流，说明窗口已重置，清除限流状态
-	if status == "allowed" && account.IsRateLimited() {
-		if err := s.ClearRateLimit(ctx, account.ID); err != nil {
-			slog.Warn("rate_limit_clear_failed", "account_id", account.ID, "error", err)
-		}
-	}
 }
 
 // ClearRateLimit 清除账号的限流状态
diff --git a/backend/internal/service/ratelimit_service_anthropic_test.go b/backend/internal/service/ratelimit_service_anthropic_test.go
index eaeaf30e60..0e75b4f914 100644
--- a/backend/internal/service/ratelimit_service_anthropic_test.go
+++ b/backend/internal/service/ratelimit_service_anthropic_test.go
@@ -2,6 +2,7 @@ package service
 
 import (
 	"net/http"
+	"strconv"
 	"testing"
 	"time"
 )
@@ -181,6 +182,142 @@ func TestIsAnthropicWindowExceeded(t *testing.T) {
 	}
 }
 
+func TestSelectAnthropicFableWindowLimit_RejectedStatus(t *testing.T) {
+	now := time.Now()
+	reset := now.Add(80 * time.Hour).Truncate(time.Second)
+
+	headers := http.Header{}
+	headers.Set("anthropic-ratelimit-unified-7d_oi-status", "rejected")
+	headers.Set("anthropic-ratelimit-unified-7d_oi-utilization", "1.0")
+	headers.Set("anthropic-ratelimit-unified-7d_oi-surpassed-threshold", "1.0")
+	headers.Set("anthropic-ratelimit-unified-7d_oi-reset", strconv.FormatInt(reset.Unix(), 10))
+
+	limit := selectAnthropicFableWindowLimit(headers, now)
+	if limit == nil {
+		t.Fatal("expected non-nil limit")
+	}
+	if !limit.resetAt.Equal(reset) {
+		t.Errorf("expected resetAt=%v, got %v", reset, limit.resetAt)
+	}
+	if limit.reason != anthropicFableWindowReason {
+		t.Errorf("expected reason=%q, got %q", anthropicFableWindowReason, limit.reason)
+	}
+}
+
+func TestSelectAnthropicFableWindowLimit_UtilizationOnly(t *testing.T) {
+	// 无 status 头时，utilization >= 1.0 也应视为超限
+	now := time.Now()
+	reset := now.Add(3 * 24 * time.Hour).Truncate(time.Second)
+
+	headers := http.Header{}
+	headers.Set("anthropic-ratelimit-unified-7d_oi-utilization", "1.0")
+	headers.Set("anthropic-ratelimit-unified-7d_oi-reset", strconv.FormatInt(reset.Unix(), 10))
+
+	limit := selectAnthropicFableWindowLimit(headers, now)
+	if limit == nil {
+		t.Fatal("expected non-nil limit")
+	}
+	if !limit.resetAt.Equal(reset) {
+		t.Errorf("expected resetAt=%v, got %v", reset, limit.resetAt)
+	}
+}
+
+func TestSelectAnthropicFableWindowLimit_AllowedReturnsNil(t *testing.T) {
+	now := time.Now()
+	headers := http.Header{}
+	headers.Set("anthropic-ratelimit-unified-7d_oi-status", "allowed")
+	headers.Set("anthropic-ratelimit-unified-7d_oi-utilization", "0.56")
+	headers.Set("anthropic-ratelimit-unified-7d_oi-reset", strconv.FormatInt(now.Add(80*time.Hour).Unix(), 10))
+
+	if limit := selectAnthropicFableWindowLimit(headers, now); limit != nil {
+		t.Errorf("expected nil limit for allowed window, got %+v", limit)
+	}
+}
+
+func TestSelectAnthropicFableWindowLimit_NoHeadersReturnsNil(t *testing.T) {
+	if limit := selectAnthropicFableWindowLimit(http.Header{}, time.Now()); limit != nil {
+		t.Errorf("expected nil limit for empty headers, got %+v", limit)
+	}
+}
+
+func TestSelectAnthropicFableWindowLimit_FallsBackToAggregateReset(t *testing.T) {
+	// 7d_oi-reset 缺失时回退聚合 anthropic-ratelimit-unified-reset
+	now := time.Now()
+	reset := now.Add(80 * time.Hour).Truncate(time.Second)
+
+	headers := http.Header{}
+	headers.Set("anthropic-ratelimit-unified-7d_oi-status", "rejected")
+	headers.Set("anthropic-ratelimit-unified-reset", strconv.FormatInt(reset.Unix(), 10))
+
+	limit := selectAnthropicFableWindowLimit(headers, now)
+	if limit == nil {
+		t.Fatal("expected non-nil limit via aggregate reset fallback")
+	}
+	if !limit.resetAt.Equal(reset) {
+		t.Errorf("expected resetAt=%v, got %v", reset, limit.resetAt)
+	}
+}
+
+func TestSelectAnthropicFableWindowLimit_RejectedWithoutAnyResetReturnsNil(t *testing.T) {
+	headers := http.Header{}
+	headers.Set("anthropic-ratelimit-unified-7d_oi-status", "rejected")
+
+	if limit := selectAnthropicFableWindowLimit(headers, time.Now()); limit != nil {
+		t.Errorf("expected nil limit when no reset time available, got %+v", limit)
+	}
+}
+
+func TestParseAnthropicAggregateReset(t *testing.T) {
+	now := time.Now()
+	future := now.Add(80 * time.Hour).Truncate(time.Second)
+
+	tests := []struct {
+		name   string
+		value  string
+		want   time.Time
+		wantOK bool
+	}{
+		{"valid seconds", strconv.FormatInt(future.Unix(), 10), future, true},
+		{"valid milliseconds", strconv.FormatInt(future.UnixMilli(), 10), future, true},
+		{"empty", "", time.Time{}, false},
+		{"garbage", "abc", time.Time{}, false},
+		{"in the past", strconv.FormatInt(now.Add(-time.Hour).Unix(), 10), time.Time{}, false},
+		{"too far in the future", strconv.FormatInt(now.Add(30*24*time.Hour).Unix(), 10), time.Time{}, false},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			headers := http.Header{}
+			if tc.value != "" {
+				headers.Set("anthropic-ratelimit-unified-reset", tc.value)
+			}
+			got, ok := parseAnthropicAggregateReset(headers, now)
+			if ok != tc.wantOK {
+				t.Fatalf("expected ok=%v, got %v", tc.wantOK, ok)
+			}
+			if ok && !got.Equal(tc.want) {
+				t.Errorf("expected %v, got %v", tc.want, got)
+			}
+		})
+	}
+}
+
+func TestIsAnthropicWindowRejected(t *testing.T) {
+	headers := http.Header{}
+	headers.Set("anthropic-ratelimit-unified-7d_oi-status", "Rejected")
+	headers.Set("anthropic-ratelimit-unified-5h-status", "allowed")
+
+	if !isAnthropicWindowRejected(headers, "7d_oi") {
+		t.Error("expected 7d_oi to be rejected (case insensitive)")
+	}
+	if isAnthropicWindowRejected(headers, "5h") {
+		t.Error("expected 5h not rejected")
+	}
+	if isAnthropicWindowRejected(headers, "7d") {
+		t.Error("expected missing 7d status not rejected")
+	}
+}
+
 // assertAnthropicResult is a test helper that verifies the result is non-nil and
 // has the expected resetAt unix timestamp.
 func assertAnthropicResult(t *testing.T, result *anthropic429Result, wantUnix int64) {
diff --git a/backend/internal/service/ratelimit_service_anthropic_window_limit_test.go b/backend/internal/service/ratelimit_service_anthropic_window_limit_test.go
index 6168b250a6..a13e8fe333 100644
--- a/backend/internal/service/ratelimit_service_anthropic_window_limit_test.go
+++ b/backend/internal/service/ratelimit_service_anthropic_window_limit_test.go
@@ -14,9 +14,14 @@ import (
 
 type anthropicWindowLimitRepo struct {
 	mockAccountRepoForGemini
-	rateLimitCalls     int
-	tempUnschedCalls   int
-	lastRateLimitReset time.Time
+	rateLimitCalls          int
+	tempUnschedCalls        int
+	lastRateLimitReset      time.Time
+	modelRateLimitCalls     int
+	lastModelRateLimitScope string
+	lastModelRateLimitReset time.Time
+	sessionWindowCalls      int
+	lastExtraUpdates        map[string]any
 }
 
 func (r *anthropicWindowLimitRepo) SetRateLimited(_ context.Context, _ int64, resetAt time.Time) error {
@@ -30,6 +35,23 @@ func (r *anthropicWindowLimitRepo) SetTempUnschedulable(_ context.Context, _ int
 	return nil
 }
 
+func (r *anthropicWindowLimitRepo) SetModelRateLimit(_ context.Context, _ int64, scope string, resetAt time.Time, _ ...string) error {
+	r.modelRateLimitCalls++
+	r.lastModelRateLimitScope = scope
+	r.lastModelRateLimitReset = resetAt
+	return nil
+}
+
+func (r *anthropicWindowLimitRepo) UpdateSessionWindow(_ context.Context, _ int64, _, _ *time.Time, _ string) error {
+	r.sessionWindowCalls++
+	return nil
+}
+
+func (r *anthropicWindowLimitRepo) UpdateExtra(_ context.Context, _ int64, updates map[string]any) error {
+	r.lastExtraUpdates = updates
+	return nil
+}
+
 func TestHandleUpstreamError_AnthropicWindowLimitPreemptsTempUnschedRule(t *testing.T) {
 	resetAt := time.Now().Add(3 * time.Hour).Truncate(time.Second)
 	headers := http.Header{}
@@ -66,3 +88,142 @@ func TestHandleUpstreamError_AnthropicWindowLimitPreemptsTempUnschedRule(t *test
 	require.Equal(t, 1, repo.rateLimitCalls)
 	require.Equal(t, resetAt, repo.lastRateLimitReset)
 }
+
+// fable429Headers 构造 7d_oi（Fable 专属 7d 窗口）触发 429 的完整响应头，
+// 数值取自真实抓包（5h/7d 均 allowed，仅 7d_oi rejected）。
+func fable429Headers(reset5h, resetOI time.Time) http.Header {
+	headers := http.Header{}
+	headers.Set("anthropic-ratelimit-unified-5h-reset", strconv.FormatInt(reset5h.Unix(), 10))
+	headers.Set("anthropic-ratelimit-unified-5h-status", "allowed")
+	headers.Set("anthropic-ratelimit-unified-5h-utilization", "0.41")
+	headers.Set("anthropic-ratelimit-unified-7d-reset", strconv.FormatInt(resetOI.Unix(), 10))
+	headers.Set("anthropic-ratelimit-unified-7d-status", "allowed")
+	headers.Set("anthropic-ratelimit-unified-7d-utilization", "0.56")
+	headers.Set("anthropic-ratelimit-unified-7d_oi-reset", strconv.FormatInt(resetOI.Unix(), 10))
+	headers.Set("anthropic-ratelimit-unified-7d_oi-status", "rejected")
+	headers.Set("anthropic-ratelimit-unified-7d_oi-surpassed-threshold", "1.0")
+	headers.Set("anthropic-ratelimit-unified-7d_oi-utilization", "1.0")
+	headers.Set("anthropic-ratelimit-unified-fallback-percentage", "0.5")
+	headers.Set("anthropic-ratelimit-unified-overage-disabled-reason", "org_level_disabled")
+	headers.Set("anthropic-ratelimit-unified-overage-status", "rejected")
+	headers.Set("anthropic-ratelimit-unified-representative-claim", "seven_day_overage_included")
+	headers.Set("anthropic-ratelimit-unified-reset", strconv.FormatInt(resetOI.Unix(), 10))
+	headers.Set("anthropic-ratelimit-unified-status", "rejected")
+	return headers
+}
+
+func TestHandleUpstreamError_Anthropic7dOiOnlyMarksModelRateLimit(t *testing.T) {
+	now := time.Now()
+	reset5h := now.Add(2 * time.Hour).Truncate(time.Second)
+	resetOI := now.Add(80 * time.Hour).Truncate(time.Second)
+	headers := fable429Headers(reset5h, resetOI)
+
+	repo := &anthropicWindowLimitRepo{}
+	svc := NewRateLimitService(repo, nil, nil, nil, nil)
+	account := &Account{
+		ID:       42,
+		Type:     AccountTypeOAuth,
+		Platform: PlatformAnthropic,
+		Credentials: map[string]any{
+			"temp_unschedulable_enabled": true,
+			"temp_unschedulable_rules": []any{
+				map[string]any{
+					"error_code":       float64(http.StatusTooManyRequests),
+					"keywords":         []any{"rate limit"},
+					"duration_minutes": float64(10),
+				},
+			},
+		},
+	}
+
+	shouldDisable := svc.HandleUpstreamError(
+		context.Background(),
+		account,
+		http.StatusTooManyRequests,
+		headers,
+		[]byte(`{"type":"error","error":{"type":"rate_limit_error","message":"This request would exceed your account's rate limit. Please try again later."}}`),
+		"claude-fable-5",
+	)
+
+	require.False(t, shouldDisable)
+	require.Zero(t, repo.rateLimitCalls, "7d_oi (Fable-only) window must not mark the whole account rate limited")
+	require.Zero(t, repo.tempUnschedCalls, "7d_oi window must not trigger local temp-unsched rules")
+	require.Zero(t, repo.sessionWindowCalls, "7d_oi window must not rewrite the 5h session window as rejected")
+	require.Equal(t, 1, repo.modelRateLimitCalls)
+	require.Equal(t, anthropicFableRateLimitKey, repo.lastModelRateLimitScope)
+	require.Equal(t, resetOI, repo.lastModelRateLimitReset)
+
+	// 429 响应头也要被动采样，避免 7d F 进度条在限流期内冻结在旧值
+	require.NotNil(t, repo.lastExtraUpdates)
+	require.Equal(t, 1.0, repo.lastExtraUpdates["passive_usage_7d_oi_utilization"])
+	require.Equal(t, resetOI.Unix(), repo.lastExtraUpdates["passive_usage_7d_oi_reset"])
+	require.Equal(t, 0.41, repo.lastExtraUpdates["session_window_utilization"])
+}
+
+func TestHandleUpstreamError_Anthropic5hWindowStillWinsOver7dOi(t *testing.T) {
+	// 5h 窗口 rejected 时必须仍按账号级限流处理（用 5h reset），同时记录 Fable 模型限流。
+	now := time.Now()
+	reset5h := now.Add(2 * time.Hour).Truncate(time.Second)
+	resetOI := now.Add(80 * time.Hour).Truncate(time.Second)
+	headers := fable429Headers(reset5h, resetOI)
+	headers.Set("anthropic-ratelimit-unified-5h-status", "rejected")
+	headers.Set("anthropic-ratelimit-unified-5h-utilization", "1.0")
+
+	repo := &anthropicWindowLimitRepo{}
+	svc := NewRateLimitService(repo, nil, nil, nil, nil)
+	account := &Account{ID: 42, Type: AccountTypeOAuth, Platform: PlatformAnthropic}
+
+	svc.HandleUpstreamError(context.Background(), account, http.StatusTooManyRequests, headers, nil, "claude-fable-5")
+
+	require.Equal(t, 1, repo.rateLimitCalls, "exhausted 5h window must still rate limit the account")
+	require.Equal(t, reset5h, repo.lastRateLimitReset)
+	require.Equal(t, 1, repo.modelRateLimitCalls)
+	require.Equal(t, anthropicFableRateLimitKey, repo.lastModelRateLimitScope)
+}
+
+func TestHandleUpstreamError_AnthropicAccountWindowStillWinsOver7dOi(t *testing.T) {
+	// 7d 窗口真超限时必须仍按账号级限流处理，同时记录 Fable 模型限流。
+	now := time.Now()
+	reset5h := now.Add(2 * time.Hour).Truncate(time.Second)
+	resetOI := now.Add(80 * time.Hour).Truncate(time.Second)
+	headers := fable429Headers(reset5h, resetOI)
+	headers.Set("anthropic-ratelimit-unified-7d-status", "rejected")
+	headers.Set("anthropic-ratelimit-unified-7d-utilization", "1.02")
+
+	repo := &anthropicWindowLimitRepo{}
+	svc := NewRateLimitService(repo, nil, nil, nil, nil)
+	account := &Account{ID: 42, Type: AccountTypeOAuth, Platform: PlatformAnthropic}
+
+	svc.HandleUpstreamError(context.Background(), account, http.StatusTooManyRequests, headers, nil, "claude-fable-5")
+
+	require.Equal(t, 1, repo.rateLimitCalls, "exhausted 7d window must still rate limit the account")
+	require.Equal(t, resetOI, repo.lastRateLimitReset)
+	require.Equal(t, 1, repo.modelRateLimitCalls, "Fable model rate limit should also be recorded")
+	require.Equal(t, anthropicFableRateLimitKey, repo.lastModelRateLimitScope)
+}
+
+func TestHandleUpstreamError_Anthropic429Without7dOiKeepsLegacyBehavior(t *testing.T) {
+	// 无 7d_oi 头、5h/7d 均未超限的 429：保持旧行为（按较早 reset 标记账号限流）。
+	now := time.Now()
+	reset5h := now.Add(2 * time.Hour).Truncate(time.Second)
+	reset7d := now.Add(80 * time.Hour).Truncate(time.Second)
+
+	headers := http.Header{}
+	headers.Set("anthropic-ratelimit-unified-5h-reset", strconv.FormatInt(reset5h.Unix(), 10))
+	headers.Set("anthropic-ratelimit-unified-5h-status", "allowed")
+	headers.Set("anthropic-ratelimit-unified-5h-utilization", "0.41")
+	headers.Set("anthropic-ratelimit-unified-7d-reset", strconv.FormatInt(reset7d.Unix(), 10))
+	headers.Set("anthropic-ratelimit-unified-7d-status", "allowed")
+	headers.Set("anthropic-ratelimit-unified-7d-utilization", "0.56")
+
+	repo := &anthropicWindowLimitRepo{}
+	svc := NewRateLimitService(repo, nil, nil, nil, nil)
+	account := &Account{ID: 42, Type: AccountTypeOAuth, Platform: PlatformAnthropic}
+
+	svc.HandleUpstreamError(context.Background(), account, http.StatusTooManyRequests, headers, nil, "claude-fable-5")
+
+	require.Zero(t, repo.modelRateLimitCalls, "no 7d_oi signal → no model rate limit")
+	require.Equal(t, 1, repo.rateLimitCalls)
+	require.Equal(t, reset5h, repo.lastRateLimitReset, "legacy path picks the sooner reset")
+	require.Equal(t, 1, repo.sessionWindowCalls)
+}
diff --git a/backend/internal/service/ratelimit_session_window_test.go b/backend/internal/service/ratelimit_session_window_test.go
index 9337ae5f8f..cb19227e54 100644
--- a/backend/internal/service/ratelimit_session_window_test.go
+++ b/backend/internal/service/ratelimit_session_window_test.go
@@ -367,6 +367,59 @@ func TestUpdateSessionWindow_NoClearUtilizationOnCorrection(t *testing.T) {
 	}
 }
 
+func TestUpdateSessionWindow_SamplesFable7dOiHeaders(t *testing.T) {
+	// 被动采样应收集 7d_oi（Fable 专属 7d 窗口）的 utilization 和 reset。
+	existingEnd := time.Now().Add(3 * time.Hour)
+	resetOIUnix := time.Now().Add(80 * time.Hour).Unix()
+
+	repo := &sessionWindowMockRepo{}
+	svc := newRateLimitServiceForTest(repo)
+
+	account := &Account{ID: 90, SessionWindowEnd: &existingEnd} // needInitWindow=false
+	headers := http.Header{}
+	headers.Set("anthropic-ratelimit-unified-5h-status", "allowed")
+	headers.Set("anthropic-ratelimit-unified-7d_oi-utilization", "0.87")
+	headers.Set("anthropic-ratelimit-unified-7d_oi-reset", fmt.Sprintf("%d", resetOIUnix))
+
+	svc.UpdateSessionWindow(context.Background(), account, headers)
+
+	if len(repo.updateExtraCalls) != 1 {
+		t.Fatalf("expected 1 UpdateExtra call, got %d", len(repo.updateExtraCalls))
+	}
+	updates := repo.updateExtraCalls[0].Updates
+	if val, ok := updates["passive_usage_7d_oi_utilization"].(float64); !ok || val != 0.87 {
+		t.Errorf("expected passive_usage_7d_oi_utilization=0.87, got %v", updates["passive_usage_7d_oi_utilization"])
+	}
+	if val, ok := updates["passive_usage_7d_oi_reset"].(int64); !ok || val != resetOIUnix {
+		t.Errorf("expected passive_usage_7d_oi_reset=%d, got %v", resetOIUnix, updates["passive_usage_7d_oi_reset"])
+	}
+}
+
+func TestUpdateSessionWindow_ClearsFable7dOiOnWindowReset(t *testing.T) {
+	// 5h 窗口重置时应连同清除 7d_oi 被动采样数据，与 7d 行为一致。
+	resetUnix := time.Now().Add(3 * time.Hour).Unix()
+
+	repo := &sessionWindowMockRepo{}
+	svc := newRateLimitServiceForTest(repo)
+
+	account := &Account{ID: 91} // no existing window → needInitWindow=true
+	headers := http.Header{}
+	headers.Set("anthropic-ratelimit-unified-5h-status", "allowed")
+	headers.Set("anthropic-ratelimit-unified-5h-reset", fmt.Sprintf("%d", resetUnix))
+
+	svc.UpdateSessionWindow(context.Background(), account, headers)
+
+	if len(repo.updateExtraCalls) != 1 {
+		t.Fatalf("expected 1 UpdateExtra (clear) call, got %d", len(repo.updateExtraCalls))
+	}
+	clearUpdates := repo.updateExtraCalls[0].Updates
+	for _, key := range []string{"passive_usage_7d_oi_utilization", "passive_usage_7d_oi_reset"} {
+		if val, present := clearUpdates[key]; !present || val != nil {
+			t.Errorf("expected %s cleared to nil on window reset, got present=%v val=%v", key, present, val)
+		}
+	}
+}
+
 func TestUpdateSessionWindow_NoStatusHeader(t *testing.T) {
 	// Should return immediately if no status header.
 	repo := &sessionWindowMockRepo{}
diff --git a/frontend/src/components/account/AccountUsageCell.vue b/frontend/src/components/account/AccountUsageCell.vue
index 67d7b165dc..a4cb70a9c3 100644
--- a/frontend/src/components/account/AccountUsageCell.vue
+++ b/frontend/src/components/account/AccountUsageCell.vue
@@ -68,6 +68,15 @@
           color="purple"
         />
 
+        <!-- 7d Fable Window (7d_oi) -->
+        <UsageProgressBar
+          v-if="usageInfo.seven_day_fable"
+          label="7d F"
+          :utilization="usageInfo.seven_day_fable.utilization"
+          :resets-at="usageInfo.seven_day_fable.resets_at"
+          color="amber"
+        />
+
         <!-- Passive sampling label + active query button -->
         <div class="flex items-center gap-1.5 mt-0.5">
           <span
diff --git a/frontend/src/components/account/__tests__/AccountUsageCell.spec.ts b/frontend/src/components/account/__tests__/AccountUsageCell.spec.ts
index fa4104f6dc..55efc197a7 100644
--- a/frontend/src/components/account/__tests__/AccountUsageCell.spec.ts
+++ b/frontend/src/components/account/__tests__/AccountUsageCell.spec.ts
@@ -655,4 +655,102 @@ describe('AccountUsageCell', () => {
 		expect(wrapper.text()).toContain('A $0.00')
 		expect(wrapper.text()).toContain('U $0.00')
   })
+
+  it('Anthropic OAuth 会渲染 7d F (Fable) 进度条，且 7d S 逻辑保留', async () => {
+    getUsage.mockResolvedValue({
+      source: 'passive',
+      five_hour: {
+        utilization: 41,
+        resets_at: '2026-07-03T10:00:00Z',
+        remaining_seconds: 3600
+      },
+      seven_day: {
+        utilization: 56,
+        resets_at: '2026-07-06T22:00:00Z',
+        remaining_seconds: 300000
+      },
+      seven_day_sonnet: {
+        utilization: 30,
+        resets_at: '2026-07-06T22:00:00Z',
+        remaining_seconds: 300000
+      },
+      seven_day_fable: {
+        utilization: 100,
+        resets_at: '2026-07-06T22:00:00Z',
+        remaining_seconds: 300000
+      }
+    })
+
+    const wrapper = mount(AccountUsageCell, {
+      props: {
+        account: makeAccount({
+          id: 3001,
+          platform: 'anthropic',
+          type: 'oauth',
+          extra: {}
+        })
+      },
+      global: {
+        stubs: {
+          UsageProgressBar: {
+            props: ['label', 'utilization', 'resetsAt', 'color'],
+            template: '<div class="usage-bar">{{ label }}|{{ utilization }}</div>'
+          },
+          AccountQuotaInfo: true,
+          GrokQuotaProbeCell: true
+        }
+      }
+    })
+
+    await flushPromises()
+
+    expect(wrapper.text()).toContain('5h|41')
+    expect(wrapper.text()).toContain('7d|56')
+    expect(wrapper.text()).toContain('7d S|30')
+    expect(wrapper.text()).toContain('7d F|100')
+  })
+
+  it('Anthropic OAuth 无 Fable 数据时不渲染 7d F 进度条', async () => {
+    getUsage.mockResolvedValue({
+      source: 'passive',
+      five_hour: {
+        utilization: 41,
+        resets_at: '2026-07-03T10:00:00Z',
+        remaining_seconds: 3600
+      },
+      seven_day: {
+        utilization: 56,
+        resets_at: '2026-07-06T22:00:00Z',
+        remaining_seconds: 300000
+      }
+    })
+
+    const wrapper = mount(AccountUsageCell, {
+      props: {
+        account: makeAccount({
+          id: 3002,
+          platform: 'anthropic',
+          type: 'oauth',
+          extra: {}
+        })
+      },
+      global: {
+        stubs: {
+          UsageProgressBar: {
+            props: ['label', 'utilization', 'resetsAt', 'color'],
+            template: '<div class="usage-bar">{{ label }}|{{ utilization }}</div>'
+          },
+          AccountQuotaInfo: true,
+          GrokQuotaProbeCell: true
+        }
+      }
+    })
+
+    await flushPromises()
+
+    expect(wrapper.text()).toContain('5h|41')
+    expect(wrapper.text()).toContain('7d|56')
+    expect(wrapper.text()).not.toContain('7d S')
+    expect(wrapper.text()).not.toContain('7d F')
+  })
 })
diff --git a/frontend/src/types/index.ts b/frontend/src/types/index.ts
index 3636791ebd..f304a85341 100644
--- a/frontend/src/types/index.ts
+++ b/frontend/src/types/index.ts
@@ -984,6 +984,7 @@ export interface AccountUsageInfo {
   five_hour: UsageProgress | null
   seven_day: UsageProgress | null
   seven_day_sonnet: UsageProgress | null
+  seven_day_fable?: UsageProgress | null
   gemini_shared_daily?: UsageProgress | null
   gemini_pro_daily?: UsageProgress | null
   gemini_flash_daily?: UsageProgress | null