diff --git a/scripts/batch_o3_prompts.py b/scripts/batch_o3_prompts.py
index c34a75d..044ec19 100644
--- a/scripts/batch_o3_prompts.py
+++ b/scripts/batch_o3_prompts.py
@@ -20,10 +20,13 @@ from pathlib import Path
 from typing import Any, Dict
 
 from dotenv import load_dotenv
-import openai
+from openai import OpenAI
 
 MODEL = "o3"
 
+# instantiate the v1 OpenAI client (api_key read from environment/.env)
+client = OpenAI()
+
 
 def load_template(path: Path) -> str:
     with path.open(encoding="utf-8") as fh:
@@ -43,7 +46,7 @@ def write_output(path: Path, record: Dict[str, Any]) -> None:
 
 
 def call_o3(prompt: str) -> str:
-    response = openai.Completion.create(
+    response = client.completions.create(
         model=MODEL,
         prompt=prompt,
         max_tokens=1024,