diff --git a/pkg/providers/error_classifier.go b/pkg/providers/error_classifier.go
index e7691aa93..18fb9e6ab 100644
--- a/pkg/providers/error_classifier.go
+++ b/pkg/providers/error_classifier.go
@@ -177,6 +177,8 @@ func classifyByStatus(status int) FailoverReason {
 		return FailoverAuth
 	case status == 402:
 		return FailoverBilling
+	case status == 404:
+		return FailoverTimeout
 	case status == 408:
 		return FailoverTimeout
 	case status == 429:
diff --git a/pkg/providers/error_classifier_test.go b/pkg/providers/error_classifier_test.go
index 46b180835..6c8097847 100644
--- a/pkg/providers/error_classifier_test.go
+++ b/pkg/providers/error_classifier_test.go
@@ -39,6 +39,7 @@ func TestClassifyError_StatusCodes(t *testing.T) {
 		{401, FailoverAuth},
 		{403, FailoverAuth},
 		{402, FailoverBilling},
+		{404, FailoverTimeout},
 		{408, FailoverTimeout},
 		{429, FailoverRateLimit},
 		{400, FailoverFormat},
@@ -264,6 +265,22 @@ func TestClassifyError_UnknownError(t *testing.T) {
 	}
 }
 
+func TestClassifyError_404TriggersFallback(t *testing.T) {
+	// OpenRouter returns 404 when model endpoint doesn't exist.
+	// This should be classified as FailoverTimeout (retriable) so fallback kicks in.
+	err := fmt.Errorf("fallback: unclassified error from openrouter/qwen3.6-plus-preview:free: API request failed:\n  Status: 404\n  Body:   {\"error\":{\"message\":\"No endpoints found for qwen3.6-plus-preview:free.\",\"code\":404}}")
+	result := ClassifyError(err, "openrouter", "qwen3.6-plus-preview:free")
+	if result == nil {
+		t.Fatal("expected non-nil for 404 error")
+	}
+	if result.Reason != FailoverTimeout {
+		t.Errorf("reason = %q, want %q (retriable so fallback is triggered)", result.Reason, FailoverTimeout)
+	}
+	if !result.IsRetriable() {
+		t.Errorf("expected 404 to be retriable")
+	}
+}
+
 func TestClassifyError_ProviderModelPropagation(t *testing.T) {
 	err := errors.New("rate limit exceeded")
 	result := ClassifyError(err, "my-provider", "my-model")