diff --git a/packages/backend/server/src/__tests__/mocks/copilot.mock.ts b/packages/backend/server/src/__tests__/mocks/copilot.mock.ts
index 83d2746ca..4b88ea2b2 100644
--- a/packages/backend/server/src/__tests__/mocks/copilot.mock.ts
+++ b/packages/backend/server/src/__tests__/mocks/copilot.mock.ts
@@ -111,6 +111,19 @@ export class MockCopilotProvider extends OpenAIProvider {
         },
       ],
     },
+    {
+      id: 'gemini-2.5-pro',
+      capabilities: [
+        {
+          input: [ModelInputType.Text, ModelInputType.Image],
+          output: [
+            ModelOutputType.Text,
+            ModelOutputType.Object,
+            ModelOutputType.Structured,
+          ],
+        },
+      ],
+    },
   ];
 
   override async text(
diff --git a/packages/backend/server/src/__tests__/utils/copilot.ts b/packages/backend/server/src/__tests__/utils/copilot.ts
index 5b4019d8a..8b5171c41 100644
--- a/packages/backend/server/src/__tests__/utils/copilot.ts
+++ b/packages/backend/server/src/__tests__/utils/copilot.ts
@@ -433,7 +433,7 @@ export async function submitAudioTranscription(
   for (const [idx, buffer] of content.entries()) {
     resp = resp.attach(idx.toString(), buffer, {
       filename: fileName,
-      contentType: 'application/octet-stream',
+      contentType: 'audio/opus',
     });
   }
 
diff --git a/packages/backend/server/src/plugins/copilot/prompt/prompts.ts b/packages/backend/server/src/plugins/copilot/prompt/prompts.ts
index d276cdbe1..3a790e2a7 100644
--- a/packages/backend/server/src/plugins/copilot/prompt/prompts.ts
+++ b/packages/backend/server/src/plugins/copilot/prompt/prompts.ts
@@ -303,7 +303,7 @@ const textActions: Prompt[] = [
   {
     name: 'Transcript audio',
     action: 'Transcript audio',
-    model: 'gemini-2.5-flash',
+    model: 'gemini-2.5-pro',
     optionalModels: ['gemini-2.5-flash', 'gemini-2.5-pro'],
     messages: [
       {