diff --git a/serv/model_router.py b/serv/model_router.py
index ba1769e..326394c 100644
--- a/serv/model_router.py
+++ b/serv/model_router.py
@@ -117,23 +117,58 @@ class QwenModelProvider(BaseModelProvider):
     def model_name(self) -> str:
         return self._model_name
 
+    @staticmethod
+    def _normalize_content(value: Any) -> list[dict[str, str]]:
+        if isinstance(value, list):
+            normalized: list[dict[str, str]] = []
+            for item in value:
+                if isinstance(item, dict) and item.get("type") == "text" and isinstance(item.get("text"), str):
+                    normalized.append({"type": "text", "text": item["text"]})
+            if normalized:
+                return normalized
+        text = "" if value is None else str(value)
+        return [{"type": "text", "text": text}]
+
+    def _normalize_messages(self, messages: list[dict[str, Any]]) -> list[dict[str, Any]]:
+        normalized: list[dict[str, Any]] = []
+        for message in messages:
+            item = {k: v for k, v in message.items() if k != "content"}
+            item["content"] = self._normalize_content(message.get("content"))
+            normalized.append(item)
+        return normalized
+
     def complete(self, completion_request: CompletionRequest) -> dict[str, Any]:
         creds = self.oauth.get_valid_credentials()
         base_url = self.oauth.get_openai_base_url(creds)
         payload = {
             "model": self.model_name(),
-            "messages": completion_request.messages,
-            "tools": completion_request.tools,
-            "tool_choice": completion_request.tool_choice,
+            "messages": self._normalize_messages(completion_request.messages),
+            "max_tokens": 8000,
+            "metadata": {
+                "sessionId": str(uuid.uuid4()),
+                "promptId": uuid.uuid4().hex[:12],
+            },
+            "vl_high_resolution_images": True,
         }
+        if completion_request.tools:
+            payload["tools"] = completion_request.tools
         data = json.dumps(payload).encode("utf-8")
+        
+        # Add DashScope-specific headers for OAuth tokens
+        user_agent = "QwenCode/unknown (linux; x64)"
+        headers = {
+            "Content-Type": "application/json",
+            "Authorization": f"Bearer {creds['access_token']}",
+            "User-Agent": user_agent,
+            "X-DashScope-CacheControl": "enable",
+            "X-DashScope-UserAgent": user_agent,
+            "X-DashScope-AuthType": "qwen-oauth",
+            "Accept": "application/json",
+        }
         req = request.Request(
             f"{base_url}/chat/completions",
             data=data,
-            headers={
-                "Content-Type": "application/json",
-                "Authorization": f"Bearer {creds['access_token']}",
-            },
+            headers=headers,
             method="POST",
         )
         try:
diff --git a/serv/oauth.py b/serv/oauth.py
index 7fac8a8..bcf259b 100644
--- a/serv/oauth.py
+++ b/serv/oauth.py
@@ -22,9 +22,13 @@ QWEN_SCOPE = "openid profile email model.completion"
 QWEN_DEVICE_GRANT = "urn:ietf:params:oauth:grant-type:device_code"
 QWEN_DEFAULT_RESOURCE_URL = "https://dashscope.aliyuncs.com/compatible-mode/v1"
 
-# Hard-coded Qwen OAuth models (single source of truth)
+# Hard-coded Qwen OAuth models aligned with qwen-code.
 QWEN_OAUTH_MODELS = [
-    {"id": "coder-model", "name": "coder-model", "description": "Qwen 3.6 Plus — efficient hybrid model with leading coding performance"},
+    {
+        "id": "coder-model",
+        "name": "coder-model",
+        "description": "Qwen 3.5 Plus — efficient hybrid model with leading coding performance",
+    },
 ]
 QWEN_OAUTH_ALLOWED_MODELS = [model["id"] for model in QWEN_OAUTH_MODELS]