diff --git a/src/backend/drivers/ai-chat/providers/infron/InfronProvider.test.ts b/src/backend/drivers/ai-chat/providers/infron/InfronProvider.test.ts
index c8d69bcbd..3358fb3cb 100644
--- a/src/backend/drivers/ai-chat/providers/infron/InfronProvider.test.ts
+++ b/src/backend/drivers/ai-chat/providers/infron/InfronProvider.test.ts
@@ -100,6 +100,16 @@ const SAMPLE_API_MODELS = [
         min_prompt_price: 10,
         min_completion_price: 30,
     },
+    {
+        id: 'qwen/qwen3.5-flash',
+        display_name: 'Qwen: Qwen 3.5 Flash',
+        category_type: 'LLM',
+        supported_endpoint_types: ['openai'],
+        context_length: 1000000,
+        max_output_tokens: 64000,
+        min_prompt_price: 0.1,
+        min_completion_price: 0.4,
+    },
     {
         id: 'anthropic/claude-haiku-4.5',
         display_name: 'Anthropic: Claude Haiku 4.5',
@@ -221,9 +231,7 @@ describe('InfronProvider construction', () => {
 describe('InfronProvider model catalog', () => {
     it('returns the infron-prefixed default model id', () => {
         const { provider } = makeProvider();
-        expect(provider.getDefaultModel()).toBe(
-            'infron:deepseek/deepseek-v4-flash',
-        );
+        expect(provider.getDefaultModel()).toBe('infron:qwen/qwen3.5-flash');
     });
 
     it('sends the API key as a bearer token on the catalog fetch', async () => {
@@ -240,6 +248,7 @@ describe('InfronProvider model catalog', () => {
         const { provider } = makeProvider();
         const ids = await provider.list();
         expect(ids).toContain('infron:deepseek/deepseek-v4-flash');
+        expect(ids).toContain(provider.getDefaultModel());
         expect(ids).toContain('infron:anthropic/claude-haiku-4.5');
         expect(ids).not.toContain('infron:black-forest-labs/flux-2.1');
         expect(ids).not.toContain('infron:example/display-only-model');
diff --git a/src/backend/drivers/ai-chat/providers/infron/InfronProvider.ts b/src/backend/drivers/ai-chat/providers/infron/InfronProvider.ts
index 9b7e4eb3c..b46fa97ec 100644
--- a/src/backend/drivers/ai-chat/providers/infron/InfronProvider.ts
+++ b/src/backend/drivers/ai-chat/providers/infron/InfronProvider.ts
@@ -80,7 +80,7 @@ export class InfronProvider implements IChatProvider {
     }
 
     getDefaultModel() {
-        return 'infron:deepseek/deepseek-v4-flash';
+        return 'infron:qwen/qwen3.5-flash';
     }
 
     /**