diff --git a/bigcodebench/provider/openai.py b/bigcodebench/provider/openai.py
index ff1459f..caf52a6 100644
--- a/bigcodebench/provider/openai.py
+++ b/bigcodebench/provider/openai.py
@@ -6,7 +6,7 @@
 from bigcodebench.gen.util.openai_request import make_auto_request
 from bigcodebench.provider.utility import make_raw_chat_prompt
 from bigcodebench.provider.base import DecoderBase
-from bigcodebench.provider.utility import concurrent_call
+from bigcodebench.provider.utility import concurrent_call, concurrent_map
 
 class OpenAIChatDecoder(DecoderBase):
     def __init__(self, name: str, base_url=None, reasoning_effort="medium", **kwargs) -> None:
@@ -38,8 +38,8 @@ def _codegen_api_batch(self, messages: List[str], num_samples: int) -> List[str]
             api_key=os.getenv("OPENAI_API_KEY", "none"), base_url=self.base_url
         )
         
-        all_outputs = []
-        for message in tqdm(messages):
+        # Helper function to process a single message with its index
+        def process_message(index, message):
             ret = make_auto_request(
                 client,
                 message=message,
@@ -52,7 +52,11 @@ def _codegen_api_batch(self, messages: List[str], num_samples: int) -> List[str]
             outputs = []
             for item in ret.choices:
                 outputs.append(item.message.content)
-            all_outputs.append(outputs)
+            return outputs
+        
+        # Process messages in parallel using utility function
+        all_outputs = concurrent_map(messages, process_message)
+        
         return all_outputs
 
     def _codegen_batch_via_concurrency(self, messages: List[str], num_samples: int) -> List[str]:
diff --git a/bigcodebench/provider/utility.py b/bigcodebench/provider/utility.py
index ad09159..cc4b2ce 100644
--- a/bigcodebench/provider/utility.py
+++ b/bigcodebench/provider/utility.py
@@ -1,6 +1,7 @@
 from typing import List
 from transformers import AutoTokenizer
-from concurrent.futures import ThreadPoolExecutor
+from concurrent.futures import ThreadPoolExecutor, as_completed
+from tqdm import tqdm
 
 EOS = [
     "<|endoftext|>",
@@ -80,4 +81,31 @@ def make_raw_chat_prompt(
 def concurrent_call(n, callback, /, *args, **kwargs):
     with ThreadPoolExecutor(max_workers=n) as executor:
         futures = [executor.submit(callback, *args, **kwargs) for _ in range(n)]
-        return [future.result() for future in futures]
\ No newline at end of file
+        return [future.result() for future in futures]
+
+
+# Parallel processing utility for processing multiple different items concurrently.
+# Unlike concurrent_call which runs the same operation n times, concurrent_map 
+# processes n different items in parallel (similar to map() but concurrent).
+# Automatically tracks indices to preserve output order and shows progress with tqdm.
+def concurrent_map(items, callback, /, *args, **kwargs):
+    """
+    Process a list of items in parallel using a callback function.
+    
+    Args:
+        items: List of items to process
+        callback: Function that takes (index, item, *args, **kwargs) and returns a result
+        *args, **kwargs: Additional arguments passed to callback
+    
+    Returns:
+        List of results in the same order as input items
+    """
+    with ThreadPoolExecutor() as executor:
+        futures = {executor.submit(callback, i, item, *args, **kwargs): i 
+                   for i, item in enumerate(items)}
+        results = [None] * len(items)
+        # Collect results as they complete with progress bar
+        for future in tqdm(as_completed(futures), total=len(items)):
+            index = futures[future]
+            results[index] = future.result()
+        return results
\ No newline at end of file