diff --git a/backend/internal/service/openai_access_state_failover_test.go b/backend/internal/service/openai_access_state_failover_test.go
index 48c8fb617e..92254d92e5 100644
--- a/backend/internal/service/openai_access_state_failover_test.go
+++ b/backend/internal/service/openai_access_state_failover_test.go
@@ -226,6 +226,66 @@ func TestOpenAIStreamSemanticStatusesPreservedAcrossTerminalShapes(t *testing.T)
 	}
 }
 
+// 不少 OpenAI 兼容上游在流内错误对象里用 status 而不是 status_code 报告状态码。
+// 只认 status_code 会把它们降级成通用 502，账号健康与 failover 判定随之失效。
+func TestOpenAIStreamSemanticStatusHonorsErrorStatusAlias(t *testing.T) {
+	tests := []struct {
+		name         string
+		body         string
+		status       int
+		wantFailover bool
+	}{
+		{
+			name:         "response.error.status unauthorized",
+			body:         `{"type":"response.failed","response":{"error":{"code":"server_error","status":401,"message":"upstream rejected the key"}}}`,
+			status:       http.StatusUnauthorized,
+			wantFailover: true,
+		},
+		{
+			name:         "error.status rate limited",
+			body:         `{"type":"error","error":{"code":"server_error","status":429,"message":"upstream is busy"}}`,
+			status:       http.StatusTooManyRequests,
+			wantFailover: true,
+		},
+		{
+			name:         "error.status overloaded",
+			body:         `{"type":"error","error":{"code":"server_error","status":529,"message":"upstream is overloaded"}}`,
+			status:       529,
+			wantFailover: true,
+		},
+		{
+			name:   "response.error.status forbidden without account signal",
+			body:   `{"type":"response.failed","response":{"error":{"code":"server_error","status":403,"message":"request was rejected"}}}`,
+			status: http.StatusForbidden,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			payload := []byte(tt.body)
+			message := extractOpenAISSEErrorMessage(payload)
+			require.Equal(t, tt.status, openAIStreamFailureStatus(payload, message))
+			require.Equal(t, tt.wantFailover, openAIStreamErrorEventShouldFailover(payload, message))
+			require.Equal(t, tt.wantFailover, openAIStreamFailedEventShouldFailover(payload, message))
+		})
+	}
+}
+
+func TestOpenAIStreamCredentialFailureHonorsErrorStatusAlias(t *testing.T) {
+	require.True(t, openAIStreamCredentialAuthFailure([]byte(`{"type":"error","error":{"code":"server_error","status":401,"message":"credential rejected"}}`)))
+	require.True(t, openAIStreamCredentialAuthFailure([]byte(`{"type":"response.failed","response":{"error":{"code":"server_error","status":401,"message":"credential rejected"}}}`)))
+	require.False(t, openAIStreamCredentialAuthFailure([]byte(`{"type":"response.failed","response":{"error":{"code":"server_error","status":500,"message":"transient upstream failure"}}}`)))
+}
+
+// 上游把 status 报成 5xx 时仍然是通用上游故障：既不改账号状态，也不冒充认证/限流。
+func TestOpenAIStreamErrorStatusAliasKeepsGeneric5xxUnclassified(t *testing.T) {
+	payload := []byte(`{"type":"response.failed","response":{"error":{"code":"server_error","status":500,"type":"server_error","message":"rv_shape_invalid: temporary response validation failure after partial output; retry your request if your client can recover partial output."},"id":"resp_0","object":"response","status":"failed"},"sequence_number":80}`)
+	message := extractOpenAISSEErrorMessage(payload)
+
+	require.Equal(t, http.StatusBadGateway, openAIStreamFailureStatus(payload, message))
+	require.False(t, openAIStreamCredentialAuthFailure(payload))
+	require.True(t, openAIStreamFailedEventShouldFailover(payload, message))
+}
+
 func TestOpenAIStreamBareErrorUsesSemanticFailover(t *testing.T) {
 	payload := []byte(`{"error":{"type":"rate_limit_error","code":"rate_limit_exceeded","message":"slow down"}}`)
 	require.True(t, openAIStreamErrorEventShouldFailover(payload, "slow down"))
diff --git a/backend/internal/service/openai_gateway_passthrough.go b/backend/internal/service/openai_gateway_passthrough.go
index f421a3f6bd..4ff19f6781 100644
--- a/backend/internal/service/openai_gateway_passthrough.go
+++ b/backend/internal/service/openai_gateway_passthrough.go
@@ -1366,6 +1366,19 @@ func sanitizeOpenAICapacityShedErrorCodeForClient(payload []byte) ([]byte, bool)
 	return updated, changed
 }
 
+// openAIStreamErrorStatusPaths 覆盖流内 error / response.failed 事件里上游状态码的
+// 两种拼写：OpenAI 用 status_code，而不少 OpenAI 兼容上游（含二级中转）只写 status。
+// 只认 status_code 会把 401/403/429/529 一律降级成通用 502，账号健康与 failover
+// 判定随之失效。WS 路径的 openAIWSPayloadTransientStatus 早已同时读两种拼写。
+var openAIStreamErrorStatusPaths = []string{
+	"response.error.status_code",
+	"response.error.status",
+	"error.status_code",
+	"error.status",
+	"status_code",
+	"status",
+}
+
 func openAIStreamFailedEventSemanticStatus(payload []byte, message string) int {
 	if isOpenAIContextWindowError(message, payload) {
 		return http.StatusBadRequest
@@ -1377,7 +1390,7 @@ func openAIStreamFailedEventSemanticStatus(payload []byte, message string) int {
 		errType = strings.ToLower(strings.TrimSpace(gjson.GetBytes(payload, "error.type").String()))
 	}
 	combined := strings.TrimSpace(errType + " " + code + " " + strings.ToLower(strings.TrimSpace(message)))
-	for _, path := range []string{"response.error.status_code", "error.status_code", "status_code"} {
+	for _, path := range openAIStreamErrorStatusPaths {
 		if status := int(gjson.GetBytes(payload, path).Int()); status == http.StatusUnauthorized ||
 			status == http.StatusForbidden || status == http.StatusTooManyRequests || status == 529 {
 			return status
@@ -1425,7 +1438,7 @@ func openAIStreamCredentialAuthFailure(payload []byte) bool {
 	if len(bytes.TrimSpace(payload)) == 0 || !gjson.ValidBytes(payload) {
 		return false
 	}
-	for _, path := range []string{"response.error.status_code", "error.status_code", "status_code"} {
+	for _, path := range openAIStreamErrorStatusPaths {
 		if int(gjson.GetBytes(payload, path).Int()) == http.StatusUnauthorized {
 			return true
 		}