diff --git a/internal/runtime/executor/claude_executor_fable_ratelimit_test.go b/internal/runtime/executor/claude_executor_fable_ratelimit_test.go
new file mode 100644
index 000000000..8efe77cf9
--- /dev/null
+++ b/internal/runtime/executor/claude_executor_fable_ratelimit_test.go
@@ -0,0 +1,221 @@
+package executor
+
+import (
+	"context"
+	"errors"
+	"io"
+	"net/http"
+	"net/http/httptest"
+	"strconv"
+	"strings"
+	"sync/atomic"
+	"testing"
+	"time"
+
+	"github.com/google/uuid"
+	"github.com/router-for-me/CLIProxyAPI/v7/internal/config"
+	"github.com/router-for-me/CLIProxyAPI/v7/internal/registry"
+	cliproxyauth "github.com/router-for-me/CLIProxyAPI/v7/sdk/cliproxy/auth"
+	cliproxyexecutor "github.com/router-for-me/CLIProxyAPI/v7/sdk/cliproxy/executor"
+	sdktranslator "github.com/router-for-me/CLIProxyAPI/v7/sdk/translator"
+)
+
+func TestClassifyClaudeUpstreamError_FableOnlyRejectionIsModelScoped(t *testing.T) {
+	// Given
+	headers := http.Header{
+		"Anthropic-Ratelimit-Unified-Status":       []string{"rejected"},
+		"Anthropic-Ratelimit-Unified-5h-Status":    []string{"allowed"},
+		"Anthropic-Ratelimit-Unified-7d-Status":    []string{"allowed"},
+		"Anthropic-Ratelimit-Unified-7d_oi-Status": []string{"rejected"},
+		"Retry-After": []string{"120"},
+	}
+
+	// When
+	err := classifyClaudeUpstreamError(http.StatusTooManyRequests, headers, []byte(`{"type":"error","error":{"type":"rate_limit_error","message":"Fable usage window rejected."}}`))
+
+	// Then
+	var scoped interface{ IsCredentialScoped() bool }
+	if !errors.As(err, &scoped) || scoped == nil {
+		t.Fatalf("expected %T to expose credential scope", err)
+	}
+	if scoped.IsCredentialScoped() {
+		t.Fatal("Fable-only 7d_oi rejection was credential-scoped; want model-scoped")
+	}
+}
+
+func TestClassifyClaudeUpstreamError_SharedOrAmbiguousRejectionRemainsCredentialScoped(t *testing.T) {
+	tests := []struct {
+		name    string
+		headers http.Header
+	}{
+		{
+			name: "explicit 5h rejection",
+			headers: http.Header{
+				"Anthropic-Ratelimit-Unified-5h-Status": []string{"rejected"},
+				"Anthropic-Ratelimit-Unified-7d-Status": []string{"allowed"},
+			},
+		},
+		{
+			name: "explicit shared 7d rejection",
+			headers: http.Header{
+				"Anthropic-Ratelimit-Unified-5h-Status": []string{"allowed"},
+				"Anthropic-Ratelimit-Unified-7d-Status": []string{"rejected"},
+			},
+		},
+		{
+			name: "aggregate rejection with shared statuses missing",
+			headers: http.Header{
+				"Anthropic-Ratelimit-Unified-Status": []string{"rejected"},
+			},
+		},
+		{
+			name: "aggregate rejection with shared statuses malformed",
+			headers: http.Header{
+				"Anthropic-Ratelimit-Unified-Status":    []string{"rejected"},
+				"Anthropic-Ratelimit-Unified-5h-Status": []string{"unknown"},
+				"Anthropic-Ratelimit-Unified-7d-Status": []string{"invalid"},
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			// When
+			err := classifyClaudeUpstreamError(http.StatusTooManyRequests, tt.headers, []byte(`{"type":"error","error":{"type":"rate_limit_error","message":"Shared usage window rejected."}}`))
+
+			// Then
+			var scoped interface{ IsCredentialScoped() bool }
+			if !errors.As(err, &scoped) || scoped == nil {
+				t.Fatalf("expected %T to expose credential scope", err)
+			}
+			if !scoped.IsCredentialScoped() {
+				t.Fatal("shared or ambiguous rejection was model-scoped; want credential-scoped")
+			}
+		})
+	}
+}
+
+func TestClassifyClaudeUpstreamError_FableRetryDurationRemainsAvailable(t *testing.T) {
+	tests := []struct {
+		name     string
+		headers  http.Header
+		min, max time.Duration
+	}{
+		{
+			name: "7d_oi reset",
+			headers: http.Header{
+				"Anthropic-Ratelimit-Unified-Status":       []string{"rejected"},
+				"Anthropic-Ratelimit-Unified-5h-Status":    []string{"allowed"},
+				"Anthropic-Ratelimit-Unified-7d-Status":    []string{"allowed"},
+				"Anthropic-Ratelimit-Unified-7d_oi-Status": []string{"rejected"},
+				"Anthropic-Ratelimit-Unified-7d_oi-Reset":  []string{strconv.FormatInt(time.Now().Add(2*time.Hour).Unix(), 10)},
+			},
+			min: 2*time.Hour - 5*time.Second,
+			max: 2*time.Hour + 35*time.Second,
+		},
+		{
+			name: "retry-after",
+			headers: http.Header{
+				"Anthropic-Ratelimit-Unified-Status":       []string{"rejected"},
+				"Anthropic-Ratelimit-Unified-5h-Status":    []string{"allowed"},
+				"Anthropic-Ratelimit-Unified-7d-Status":    []string{"allowed"},
+				"Anthropic-Ratelimit-Unified-7d_oi-Status": []string{"rejected"},
+				"Retry-After": []string{"120"},
+			},
+			min: 2 * time.Minute,
+			max: 2*time.Minute + 30*time.Second,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			// When
+			err := classifyClaudeUpstreamError(http.StatusTooManyRequests, tt.headers, []byte(`{"type":"error","error":{"type":"rate_limit_error","message":"Fable usage window rejected."}}`))
+
+			// Then
+			var retry retryAfterProvider
+			if !errors.As(err, &retry) || retry == nil || retry.RetryAfter() == nil {
+				t.Fatalf("expected Fable rate-limit error to retain a retry duration, got %v", err)
+			}
+			if got := *retry.RetryAfter(); got < tt.min || got > tt.max {
+				t.Fatalf("RetryAfter = %v, want between %v and %v", got, tt.min, tt.max)
+			}
+		})
+	}
+}
+
+func TestClaudeExecutor_AuthManager_FableOnlyRejectionDoesNotBlockOpus(t *testing.T) {
+	var fableAttempts, opusAttempts atomic.Int32
+	reset := time.Now().Add(2 * time.Hour).Unix()
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		body, errRead := io.ReadAll(r.Body)
+		if errRead != nil {
+			http.Error(w, "failed to read sanitized test request", http.StatusBadRequest)
+			return
+		}
+		switch {
+		case strings.Contains(string(body), `"model":"claude-fable-5"`):
+			fableAttempts.Add(1)
+			w.Header().Set("Content-Type", "application/json")
+			w.Header().Set("Anthropic-Ratelimit-Unified-Status", "rejected")
+			w.Header().Set("Anthropic-Ratelimit-Unified-5h-Status", "allowed")
+			w.Header().Set("Anthropic-Ratelimit-Unified-7d-Status", "allowed")
+			w.Header().Set("Anthropic-Ratelimit-Unified-7d_oi-Status", "rejected")
+			w.Header().Set("Anthropic-Ratelimit-Unified-7d_oi-Reset", strconv.FormatInt(reset, 10))
+			w.Header().Set("Retry-After", "120")
+			w.WriteHeader(http.StatusTooManyRequests)
+			_, _ = w.Write([]byte(`{"type":"error","error":{"type":"rate_limit_error","message":"Fable usage window rejected."}}`))
+		case strings.Contains(string(body), `"model":"claude-opus-5"`):
+			opusAttempts.Add(1)
+			w.Header().Set("Content-Type", "application/json")
+			w.WriteHeader(http.StatusOK)
+			_, _ = w.Write([]byte(`{"id":"msg-opus-ok","type":"message","model":"claude-opus-5","role":"assistant","content":[{"type":"text","text":"ok"}]}`))
+		default:
+			http.Error(w, "unexpected sanitized test model", http.StatusBadRequest)
+		}
+	}))
+	defer server.Close()
+
+	manager := cliproxyauth.NewManager(nil, nil, nil)
+	manager.SetRetryConfig(0, 0, 0)
+	manager.RegisterExecutor(NewClaudeExecutor(&config.Config{DisableCooling: false}))
+
+	auth := &cliproxyauth.Auth{
+		ID:       uuid.NewString() + "-fable-model-scope",
+		Provider: "claude",
+		Attributes: map[string]string{
+			"api_key":  "sanitized-test-key",
+			"base_url": server.URL,
+		},
+	}
+	reg := registry.GetGlobalRegistry()
+	reg.RegisterClient(auth.ID, "claude", []*registry.ModelInfo{{ID: "claude-fable-5"}, {ID: "claude-opus-5"}})
+	t.Cleanup(func() { reg.UnregisterClient(auth.ID) })
+	if _, err := manager.Register(context.Background(), auth); err != nil {
+		t.Fatalf("register auth: %v", err)
+	}
+
+	payloadFable := []byte(`{"model":"claude-fable-5","messages":[{"role":"user","content":[{"type":"text","text":"test"}]}]}`)
+	_, errFable := manager.Execute(context.Background(), []string{"claude"}, cliproxyexecutor.Request{
+		Model:   "claude-fable-5",
+		Payload: payloadFable,
+	}, cliproxyexecutor.Options{SourceFormat: sdktranslator.FormatClaude})
+	if errFable == nil {
+		t.Fatal("expected Fable request to be rate limited")
+	}
+	if got := fableAttempts.Load(); got != 1 {
+		t.Fatalf("Fable upstream attempts = %d, want 1", got)
+	}
+
+	payloadOpus := []byte(`{"model":"claude-opus-5","messages":[{"role":"user","content":[{"type":"text","text":"test"}]}]}`)
+	_, errOpus := manager.Execute(context.Background(), []string{"claude"}, cliproxyexecutor.Request{
+		Model:   "claude-opus-5",
+		Payload: payloadOpus,
+	}, cliproxyexecutor.Options{SourceFormat: sdktranslator.FormatClaude})
+	if errOpus != nil {
+		t.Fatalf("expected Opus to reach upstream on the same credential, got: %v", errOpus)
+	}
+	if got := opusAttempts.Load(); got != 1 {
+		t.Fatalf("Opus upstream attempts = %d, want 1", got)
+	}
+}
diff --git a/internal/runtime/executor/helps/claude_ratelimit.go b/internal/runtime/executor/helps/claude_ratelimit.go
index bd091cc51..88a84a66b 100644
--- a/internal/runtime/executor/helps/claude_ratelimit.go
+++ b/internal/runtime/executor/helps/claude_ratelimit.go
@@ -17,15 +17,13 @@ const (
 )
 
 // ClaudeHeadersIndicateUnifiedRateLimitRejection reports whether response headers explicitly
-// declare an Anthropic unified 5h or 7d rate-limit rejection.
+// declare an Anthropic shared 5h or 7d rate-limit rejection. A Fable-only 7d_oi rejection
+// remains model-scoped when both shared windows are explicitly allowed.
 func ClaudeHeadersIndicateUnifiedRateLimitRejection(headers http.Header) bool {
 	if headers == nil {
 		return false
 	}
 	unifiedStatus := strings.ToLower(strings.TrimSpace(getHeaderCaseInsensitive(headers, "Anthropic-Ratelimit-Unified-Status")))
-	if unifiedStatus == "rejected" {
-		return true
-	}
 	status5h := strings.ToLower(strings.TrimSpace(getHeaderCaseInsensitive(headers, "Anthropic-Ratelimit-Unified-5h-Status")))
 	if status5h == "rejected" {
 		return true
@@ -34,11 +32,16 @@ func ClaudeHeadersIndicateUnifiedRateLimitRejection(headers http.Header) bool {
 	if status7d == "rejected" {
 		return true
 	}
-	return false
+	if unifiedStatus != "rejected" {
+		return false
+	}
+	status7dOI := strings.ToLower(strings.TrimSpace(getHeaderCaseInsensitive(headers, "Anthropic-Ratelimit-Unified-7d_oi-Status")))
+	fableOnlyRejection := status5h == "allowed" && status7d == "allowed" && status7dOI == "rejected"
+	return !fableOnlyRejection
 }
 
-// ParseClaudeRateLimitReset inspects Anthropic response headers for unified rate-limit
-// and standard Retry-After reset information, returning the conservative cooldown
+// ParseClaudeRateLimitReset inspects Anthropic response headers for shared and Fable-specific
+// unified rate-limit and standard Retry-After reset information, returning the conservative cooldown
 // duration including a bounded non-negative random grace period.
 // If no valid future reset information is present, it returns nil.
 func ParseClaudeRateLimitReset(headers http.Header, now time.Time) *time.Duration {
@@ -53,6 +56,7 @@ func parseClaudeRateLimitResetWithFuzz(headers http.Header, now time.Time, minFu
 	unifiedStatus := strings.ToLower(strings.TrimSpace(getHeaderCaseInsensitive(headers, "Anthropic-Ratelimit-Unified-Status")))
 	status5h := strings.ToLower(strings.TrimSpace(getHeaderCaseInsensitive(headers, "Anthropic-Ratelimit-Unified-5h-Status")))
 	status7d := strings.ToLower(strings.TrimSpace(getHeaderCaseInsensitive(headers, "Anthropic-Ratelimit-Unified-7d-Status")))
+	status7dOI := strings.ToLower(strings.TrimSpace(getHeaderCaseInsensitive(headers, "Anthropic-Ratelimit-Unified-7d_oi-Status")))
 
 	var candidateDeadlines []time.Time
 	var rejectedWindows []string
@@ -66,6 +70,9 @@ func parseClaudeRateLimitResetWithFuzz(headers http.Header, now time.Time, minFu
 	if status7d == "rejected" {
 		rejectedWindows = append(rejectedWindows, "7d")
 	}
+	if status7dOI == "rejected" {
+		rejectedWindows = append(rejectedWindows, "7d_oi")
+	}
 
 	// 1. Retry-After header
 	if rawRetryAfter := getHeaderCaseInsensitive(headers, "Retry-After"); rawRetryAfter != "" {
@@ -95,8 +102,17 @@ func parseClaudeRateLimitResetWithFuzz(headers http.Header, now time.Time, minFu
 		}
 	}
 
-	// 4. Unified reset header:
-	unifiedRejected := unifiedStatus == "rejected" || status5h == "rejected" || status7d == "rejected" ||
+	// 4. Fable-specific 7-day window reset (only when rejected)
+	if status7dOI == "rejected" {
+		if raw := getHeaderCaseInsensitive(headers, "Anthropic-Ratelimit-Unified-7d_oi-Reset"); raw != "" {
+			if t, ok := parseUnixOrTimestamp(raw); ok && t.After(now) {
+				candidateDeadlines = append(candidateDeadlines, t)
+			}
+		}
+	}
+
+	// 5. Unified reset header:
+	unifiedRejected := unifiedStatus == "rejected" || status5h == "rejected" || status7d == "rejected" || status7dOI == "rejected" ||
 		(unifiedStatus == "" && status5h != "allowed" && status7d != "allowed")
 
 	if unifiedRejected {