Address comments

Author: rajasbansal

src/together/resources/batch.py

@@ -85,7 +85,6 @@ def cancel_batch(self, batch_job_id: str) -> BatchJob:
             stream=False,
         )
 
-        assert isinstance(response, TogetherResponse)
         return BatchJob(**response.data)
 
 
@@ -149,3 +148,18 @@ async def list_batches(self) -> List[BatchJob]:
         assert isinstance(response, TogetherResponse)
         jobs = response.data or []
         return [BatchJob(**job) for job in jobs]
+
+    async def cancel_batch(self, batch_job_id: str) -> BatchJob:
+        requestor = api_requestor.APIRequestor(
+            client=self._client,
+        )
+
+        response, _, _ = await requestor.arequest(
+            options=TogetherRequest(
+                method="POST",
+                url=f"batches/{batch_job_id}/cancel",
+            ),
+            stream=False,
+        )
+
+        return BatchJob(**response.data)