diff --git a/.gitignore b/.gitignore
index d48035a5b..0503f3c95 100644
--- a/.gitignore
+++ b/.gitignore
@@ -166,3 +166,4 @@ applications/ColossalChat/tests/logs
 applications/ColossalChat/wandb
 applications/ColossalChat/model
 applications/ColossalChat/eval
+applications/ColossalChat/rollouts
diff --git a/applications/ColossalChat/coati/distributed/grpo_consumer.py b/applications/ColossalChat/coati/distributed/grpo_consumer.py
index 8de8b774e..70e2201fe 100644
--- a/applications/ColossalChat/coati/distributed/grpo_consumer.py
+++ b/applications/ColossalChat/coati/distributed/grpo_consumer.py
@@ -120,12 +120,16 @@ class GRPOConsumer(BaseConsumer):
                     "either max_tokens (vllm) or max_new_tokens (transformers) must be set in generate_config."
                 )
         # Initialize verifiable reward.
-        response_format_tags = {
-            "think_start": {"text": "<think>", "num_occur": 1},
-            "think_end": {"text": "</think>", "num_occur": 1},
-            "answer_start": {"text": "<answer>", "num_occur": 1},
-            "answer_end": {"text": "</answer>", "num_occur": 1},
-        }
+        response_format_tags = (
+            {
+                "think_start": {"text": "<think>", "num_occur": 1},
+                "think_end": {"text": "</think>", "num_occur": 1},
+                "answer_start": {"text": "<answer>", "num_occur": 1},
+                "answer_end": {"text": "</answer>", "num_occur": 1},
+            }
+            if grpo_config.get("reward_fn_type") == "think_answer_tags"
+            else None
+        )
         reward_model_kwargs = {
             k: v
             for k, v in grpo_config.items()
diff --git a/applications/ColossalChat/coati/distributed/launch.py b/applications/ColossalChat/coati/distributed/launch.py
index e6367d2d1..6eeb5d379 100644
--- a/applications/ColossalChat/coati/distributed/launch.py
+++ b/applications/ColossalChat/coati/distributed/launch.py
@@ -55,6 +55,8 @@ def launch_distributed(
     eval_interval: int = 100,
     eval_save_dir: Optional[str] = None,
     eval_generation_config: Optional[Dict[str, Any]] = None,
+    log_rollout_interval: int = 20,
+    rollout_log_file: str = "./rollout_log.jsonl",
 ):
     if core_algo not in ALGO_MAP:
         raise NotImplementedError(f"{core_algo} is not supported yet.")
@@ -98,6 +100,8 @@ def launch_distributed(
             project_name=project_name,
             run_name=run_name,
             wandb_group_name=wandb_group_name,
+            log_rollout_interval=log_rollout_interval,
+            rollout_log_file=rollout_log_file,
         )
         procs.append(producer)
     generate_config_consumer = copy.deepcopy(generate_config)
diff --git a/applications/ColossalChat/coati/distributed/producer.py b/applications/ColossalChat/coati/distributed/producer.py
index 0d91f43f1..75879278c 100644
--- a/applications/ColossalChat/coati/distributed/producer.py
+++ b/applications/ColossalChat/coati/distributed/producer.py
@@ -1,4 +1,5 @@
 import copy
+import json
 import os
 from typing import Any, Dict, Optional
 
@@ -49,7 +50,8 @@ class BaseProducer:
         project_name: str = None,
         run_name: str = None,
         wandb_group_name: str = None,
-        wandb_log_rollout_interval: int = 20,
+        log_rollout_interval: int = 20,
+        rollout_log_file: str = "./rollout_log.jsonl",
     ):
         self.producer_idx = producer_idx
         self.num_producers = num_producers
@@ -70,9 +72,16 @@ class BaseProducer:
         self.eval_save_dir = eval_save_dir
         self.consumer_global_step = 0
         self.eval_mode = False
-        self.wandb_rollout_data = []
-        self.wandb_log_rollout_interval = wandb_log_rollout_interval
+        self.log_rollout_interval = log_rollout_interval
         self.latest_rollout_log_step = -1
+        if producer_idx == 0:
+            if os.path.exists(rollout_log_file):
+                raise ValueError(
+                    f"Rollout log file {rollout_log_file} already exists. Please delete it or change the name."
+                )
+            else:
+                os.makedirs(os.path.dirname(rollout_log_file), exist_ok=True)
+                self.rollout_log_file = open(rollout_log_file, "w", encoding="utf8")
         if self.producer_idx == 0:
             self.wandb_run = wandb.init(
                 project=project_name,
@@ -320,6 +329,8 @@ class SimpleProducer(BaseProducer):
         project_name: str = None,
         run_name: str = None,
         wandb_group_name: str = None,
+        log_rollout_interval: int = 20,
+        rollout_log_file: str = "./rollout_log.jsonl",
     ):
         super().__init__(
             producer_idx,
@@ -342,6 +353,8 @@ class SimpleProducer(BaseProducer):
             project_name=project_name,
             run_name=run_name,
             wandb_group_name=wandb_group_name,
+            log_rollout_interval=log_rollout_interval,
+            rollout_log_file=rollout_log_file,
         )
         self.model = self.backend_cls(model_config, generate_config, self.tokenizer, num_generations)
         self.eval_generation_config = copy.deepcopy(self.model.generate_config)
@@ -353,26 +366,31 @@ class SimpleProducer(BaseProducer):
     def rollout(self, input_ids, attention_mask, **kwargs):
         rollouts = self.model.generate(input_ids, attention_mask, **kwargs)
         if self.producer_idx == 0 and not self.eval_mode:
-            wandb_rollout_data = self.wandb_rollout_data + [
-                [
-                    str(self.consumer_global_step),
-                    str(self.tokenizer.decode(rollouts["input_ids"][0][0], skip_special_tokens=True)),
-                ]
-            ]
             if (
-                self.consumer_global_step - self.latest_rollout_log_step >= self.wandb_log_rollout_interval
+                self.consumer_global_step - self.latest_rollout_log_step >= self.log_rollout_interval
                 or self.latest_rollout_log_step == -1
             ):
-                self.wandb_rollout_data = wandb_rollout_data
-                self.latest_rollout_log_step = self.consumer_global_step
-            self.wandb_run.log(
-                {
-                    "rollout/rollout_examples": wandb.Table(
-                        columns=["train_step", "rollout_examples"], data=wandb_rollout_data
+                new_record = (
+                    json.dumps(
+                        {
+                            "train_step": self.consumer_global_step,
+                            "rollout": self.tokenizer.batch_decode(
+                                rollouts["input_ids"][:, 0], skip_special_tokens=True
+                            ),
+                        }
                     )
-                }
-            )
+                    + "\n"
+                )
+                self.rollout_log_file.write(new_record)
+                self.rollout_log_file.flush()
+                self.latest_rollout_log_step = self.consumer_global_step
         return rollouts
 
+    def __del__(self):
+        if self.producer_idx == 0:
+            self.wandb_run.finish()
+        if hasattr(self, "rollout_log_file"):
+            self.rollout_log_file.close()
+
     def load_state_dict(self, state_dict):
         self.model.load_state_dict(state_dict)
diff --git a/applications/ColossalChat/rl_example.py b/applications/ColossalChat/rl_example.py
index 071912ddf..98c139f14 100644
--- a/applications/ColossalChat/rl_example.py
+++ b/applications/ColossalChat/rl_example.py
@@ -118,6 +118,9 @@ if __name__ == "__main__":
     parser.add_argument(
         "-esd", "--eval-save-dir", type=str, default="./eval", help="Directory for saving evaluation results."
     )
+    parser.add_argument(
+        "-rsd", "--rollout-save-dir", type=str, default="./rollouts", help="Directory for saving rollout loggings."
+    )
     args = parser.parse_args()
 
     if args.train_minibatch_size is None:
@@ -269,4 +272,6 @@ if __name__ == "__main__":
         eval_interval=args.eval_interval,
         eval_save_dir=os.path.join(args.eval_save_dir, args.project.replace(" ", "_")),
         eval_generation_config=eval_generation_config,
+        log_rollout_interval=20,
+        rollout_log_file=os.path.join(args.rollout_save_dir, args.project.replace(" ", "_") + ".jsonl"),
     )