diff --git a/src/llmperf/ray_clients/openai_chat_completions_client.py b/src/llmperf/ray_clients/openai_chat_completions_client.py
index f2e0a91..1798995 100644
--- a/src/llmperf/ray_clients/openai_chat_completions_client.py
+++ b/src/llmperf/ray_clients/openai_chat_completions_client.py
@@ -89,7 +89,8 @@ def llm_request(self, request_config: RequestConfig) -> Dict[str, Any]:
                         raise RuntimeError(data["error"]["message"])
                         
                     delta = data["choices"][0]["delta"]
-                    if delta.get("content", None):
+                    content = delta.get("content") or delta.get("reasoning_content")
+                    if content:
                         if not ttft:
                             ttft = time.monotonic() - start_time
                             time_to_next_token.append(ttft)
@@ -98,7 +99,7 @@ def llm_request(self, request_config: RequestConfig) -> Dict[str, Any]:
                                 time.monotonic() - most_recent_received_token_time
                             )
                         most_recent_received_token_time = time.monotonic()
-                        generated_text += delta["content"]
+                        generated_text += content
 
             total_request_time = time.monotonic() - start_time
             output_throughput = tokens_received / total_request_time