diff --git a/backend/src/main/java/com/petshop/backend/service/OpenRouterAiService.java b/backend/src/main/java/com/petshop/backend/service/OpenRouterAiService.java
index 2f093ce4..026b9a3f 100644
--- a/backend/src/main/java/com/petshop/backend/service/OpenRouterAiService.java
+++ b/backend/src/main/java/com/petshop/backend/service/OpenRouterAiService.java
@@ -31,7 +31,7 @@ public class OpenRouterAiService {
     @Value("${openrouter.api-key:}")
     private String apiKey;
 
-    @Value("${openrouter.model:mistralai/mistral-7b-instruct:free}")
+    @Value("${openrouter.model:openai/gpt-oss-120b:free}")
     private String model;
 
     private final String openRouterUrl = "https://openrouter.ai/api/v1/chat/completions";
diff --git a/backend/src/main/resources/application.yml b/backend/src/main/resources/application.yml
index adafd20f..0ba33ed8 100644
--- a/backend/src/main/resources/application.yml
+++ b/backend/src/main/resources/application.yml
@@ -73,4 +73,4 @@ logging:
       fail-on-unknown-properties: false
 openrouter:
   api-key: ${OPENROUTER_API_KEY:}
-  model: ${OPENROUTER_MODEL:mistralai/mistral-7b-instruct:free}
+  model: ${OPENROUTER_MODEL:openai/gpt-oss-120b:free}