diff --git a/rdagent/oai/backend/base.py b/rdagent/oai/backend/base.py
index 441130ff..03348754 100644
--- a/rdagent/oai/backend/base.py
+++ b/rdagent/oai/backend/base.py
@@ -109,14 +109,12 @@ class JSONParser:
                     out.append(tokval)
 
             result = "".join(out)
-            # Validate if the result is valid JSON
-            json.loads(result)
             return result
 
         except (tokenize.TokenError, json.JSONDecodeError):
             # If tokenize fails, fallback to regex method
             for python_val, json_val in replacements.items():
-                json_str = re.sub(rf"\\b{python_val}\\b", json_val, json_str)
+                json_str = re.sub(rf"\b{python_val}\b", json_val, json_str)
             return json_str
 
     @staticmethod