diff --git a/app/(chat)/api/chat/route.ts b/app/(chat)/api/chat/route.ts
index 47d7ec468..1840f41e3 100644
--- a/app/(chat)/api/chat/route.ts
+++ b/app/(chat)/api/chat/route.ts
@@ -133,6 +133,7 @@ import { saveGeneratedImages } from "@/lib/ai/runtime/generated-image-persistenc
 import {
   recordAiModelHealthFailure,
   recordAiModelHealthSuccess,
+  shouldFailoverAiModelError,
 } from "@/lib/ai/runtime/model-health";
 import type { FalImageEditTaskMetadata } from "@/lib/ai/runtime/fal-image-edit-task";
 import { saveAssistantTextOnlyMessage } from "@/lib/ai/runtime/assistant-message-persistence";
@@ -6405,6 +6406,11 @@ export async function POST(request: Request) {
               }).catch((healthError) => {
                 chatApiLogger.warn("[Chat API] Record Gemini primary health failure failed:", healthError);
               });
+
+              if (!shouldFailoverAiModelError(primaryError)) {
+                chatApiLogger.info("[Chat API] Gemini primary error is not eligible for image failover; returning original error.");
+                throw primaryError;
+              }
               
               // 🆕 尝试备用模型（支持跨服务商切换）
               let fallbackSuccess = false;
@@ -7115,6 +7121,11 @@ export async function POST(request: Request) {
               imageMarkdown = await tryGenerateImage(actualModelId, false);
 	            } catch (primaryError) {
 	              chatApiLogger.error("[Chat API] Alibaba primary model failed:", primaryError);
+
+	              if (!shouldFailoverAiModelError(primaryError)) {
+	                chatApiLogger.info("[Chat API] Alibaba primary error is not eligible for image failover; returning original error.");
+	                throw primaryError;
+	              }
 	              
 	              let fallbackSuccess = false;
               for (const candidate of fallbackCandidates) {
@@ -7530,6 +7541,10 @@ export async function POST(request: Request) {
               imageMarkdown = await tryGenerateImage(actualModelId, false);
 	            } catch (primaryError) {
 	              chatApiLogger.error("[Chat API] Volcano primary model failed:", primaryError);
+	              if (!shouldFailoverAiModelError(primaryError)) {
+	                chatApiLogger.info("[Chat API] Volcano primary error is not eligible for image failover; returning original error.");
+	                throw primaryError;
+	              }
 	              let fallbackSuccess = false;
               for (const candidate of fallbackCandidates) {
                 try {
@@ -8361,6 +8376,11 @@ export async function POST(request: Request) {
               normalizedText = await tryGenerateWithOpenAICompatModel(languageModel);
 	            } catch (primaryError) {
 	              chatApiLogger.error("[Chat API] OpenAI-compatible primary model failed:", primaryError);
+
+	              if (!shouldFailoverAiModelError(primaryError)) {
+	                chatApiLogger.info("[Chat API] OpenAI-compatible primary error is not eligible for image failover; returning original error.");
+	                throw primaryError;
+	              }
 	
 	              let fallbackSuccess = false;
               for (const candidate of fallbackCandidates) {