feat - router async batch acompletion

litellm/router.py

@@ -605,6 +605,33 @@ class Router:
                 self.fail_calls[model_name] += 1
             raise e
 
+    async def abatch_completion(
+        self, models: List[str], messages: List[Dict[str, str]], **kwargs
+    ):
+
+        async def _async_completion_no_exceptions(
+            model: str, messages: List[Dict[str, str]], **kwargs
+        ):
+            """
+            Wrapper around self.async_completion that catches exceptions and returns them as a result
+            """
+            try:
+                return await self.acompletion(model=model, messages=messages, **kwargs)
+            except Exception as e:
+                return e
+
+        _tasks = []
+        for model in models:
+            # add each task but if the task fails
+            _tasks.append(
+                _async_completion_no_exceptions(
+                    model=model, messages=messages, **kwargs
+                )
+            )
+
+        response = await asyncio.gather(*_tasks)
+        return response
+
     def image_generation(self, prompt: str, model: str, **kwargs):
         try:
             kwargs["model"] = model