diff --git a/packages/core/src/core/openaiContentGenerator/provider/dashscope.test.ts b/packages/core/src/core/openaiContentGenerator/provider/dashscope.test.ts
index 1dabaf8ab..03f673dfe 100644
--- a/packages/core/src/core/openaiContentGenerator/provider/dashscope.test.ts
+++ b/packages/core/src/core/openaiContentGenerator/provider/dashscope.test.ts
@@ -587,7 +587,7 @@ describe('DashScopeOpenAICompatibleProvider', () => {
       });
     });
 
-    it('should add empty text item with cache control if last item is not text for streaming requests', () => {
+    it('should add cache control directly to image content if last item is not text for streaming requests', () => {
       const requestWithNonTextLast: OpenAI.Chat.ChatCompletionCreateParams = {
         model: 'qwen-max',
         stream: true, // This will trigger cache control on last message
@@ -612,12 +612,12 @@ describe('DashScopeOpenAICompatibleProvider', () => {
 
       const content = result.messages[0]
         .content as OpenAI.Chat.ChatCompletionContentPart[];
-      expect(content).toHaveLength(3);
+      expect(content).toHaveLength(2);
 
-      // Should add empty text item with cache control
-      expect(content[2]).toEqual({
-        type: 'text',
-        text: '',
+      // Should add cache control directly to the image item
+      expect(content[1]).toEqual({
+        type: 'image_url',
+        image_url: { url: 'https://example.com/image.jpg' },
         cache_control: { type: 'ephemeral' },
       });
     });
@@ -691,7 +691,7 @@ describe('DashScopeOpenAICompatibleProvider', () => {
       expect(content).toEqual([
         {
           type: 'text',
-          text: '',
+          text: ' ',
           cache_control: { type: 'ephemeral' },
         },
       ]);
diff --git a/packages/core/src/core/openaiContentGenerator/provider/dashscope.ts b/packages/core/src/core/openaiContentGenerator/provider/dashscope.ts
index 9130238f1..1ad7fa111 100644
--- a/packages/core/src/core/openaiContentGenerator/provider/dashscope.ts
+++ b/packages/core/src/core/openaiContentGenerator/provider/dashscope.ts
@@ -7,7 +7,6 @@ import { tokenLimit } from '../../tokenLimits.js';
 import type {
   OpenAICompatibleProvider,
   DashScopeRequestMetadata,
-  ChatCompletionContentPartTextWithCache,
   ChatCompletionContentPartWithCache,
   ChatCompletionToolWithCache,
 } from './types.js';
@@ -225,7 +224,7 @@ export class DashScopeOpenAICompatibleProvider
         {
           type: 'text',
           text: content,
-        } as ChatCompletionContentPartTextWithCache,
+        } as ChatCompletionContentPartWithCache,
       ];
     }
     return [...content] as ChatCompletionContentPartWithCache[];
@@ -241,28 +240,18 @@ export class DashScopeOpenAICompatibleProvider
       return [
         {
           type: 'text',
-          text: '',
+          text: ' ',
           cache_control: { type: 'ephemeral' },
-        } as ChatCompletionContentPartTextWithCache,
+        } as ChatCompletionContentPartWithCache,
       ];
     }
 
+    // Add cache_control to the last item regardless of its type (text, image, or refusal)
     const lastItem = contentArray[contentArray.length - 1];
-
-    if (lastItem.type === 'text') {
-      // Add cache_control to the last text item
-      contentArray[contentArray.length - 1] = {
-        ...lastItem,
-        cache_control: { type: 'ephemeral' },
-      } as ChatCompletionContentPartTextWithCache;
-    } else {
-      // If the last item is not text, add a new text item with cache_control
-      contentArray.push({
-        type: 'text',
-        text: '',
-        cache_control: { type: 'ephemeral' },
-      } as ChatCompletionContentPartTextWithCache);
-    }
+    contentArray[contentArray.length - 1] = {
+      ...lastItem,
+      cache_control: { type: 'ephemeral' },
+    } as ChatCompletionContentPartWithCache;
 
     return contentArray;
   }
diff --git a/packages/core/src/core/openaiContentGenerator/provider/index.ts b/packages/core/src/core/openaiContentGenerator/provider/index.ts
index 9886b70f9..2f3c9ac1d 100644
--- a/packages/core/src/core/openaiContentGenerator/provider/index.ts
+++ b/packages/core/src/core/openaiContentGenerator/provider/index.ts
@@ -5,6 +5,5 @@ export { DefaultOpenAICompatibleProvider } from './default.js';
 export type {
   OpenAICompatibleProvider,
   DashScopeRequestMetadata,
-  ChatCompletionContentPartTextWithCache,
   ChatCompletionContentPartWithCache,
 } from './types.js';
diff --git a/packages/core/src/core/openaiContentGenerator/provider/types.ts b/packages/core/src/core/openaiContentGenerator/provider/types.ts
index ea7c434d7..119fdd91d 100644
--- a/packages/core/src/core/openaiContentGenerator/provider/types.ts
+++ b/packages/core/src/core/openaiContentGenerator/provider/types.ts
@@ -1,15 +1,10 @@
 import type OpenAI from 'openai';
 
 // Extended types to support cache_control for DashScope
-export interface ChatCompletionContentPartTextWithCache
-  extends OpenAI.Chat.ChatCompletionContentPartText {
-  cache_control?: { type: 'ephemeral' };
-}
-
 export type ChatCompletionContentPartWithCache =
-  | ChatCompletionContentPartTextWithCache
-  | OpenAI.Chat.ChatCompletionContentPartImage
-  | OpenAI.Chat.ChatCompletionContentPartRefusal;
+  OpenAI.Chat.ChatCompletionContentPart & {
+    cache_control?: { type: 'ephemeral' };
+  };
 
 export type ChatCompletionToolWithCache = OpenAI.Chat.ChatCompletionTool & {
   cache_control?: { type: 'ephemeral' };