diff --git a/pinecone/openapi_support/api_client.py b/pinecone/openapi_support/api_client.py
index afd6b96c..e1163c15 100644
--- a/pinecone/openapi_support/api_client.py
+++ b/pinecone/openapi_support/api_client.py
@@ -2,6 +2,7 @@
 
 import atexit
 import io
+import json
 
 from typing import Any, TYPE_CHECKING
 
@@ -212,9 +213,25 @@ def __call_api(
                 response_info = extract_response_info(headers)
                 if isinstance(return_data, dict):
                     return_data["_response_info"] = response_info
+                elif isinstance(return_data, str):
+                    if not return_data:
+                        return_data = {"_response_info": response_info}
+                    else:
+                        try:
+                            parsed = json.loads(return_data)
+                            if isinstance(parsed, dict):
+                                parsed["_response_info"] = response_info
+                                return_data = parsed
+                            else:
+                                return_data = {"_response_info": response_info}
+                        except (json.JSONDecodeError, ValueError):
+                            return_data = {"_response_info": response_info}
                 else:
                     # Dynamic attribute assignment on OpenAPI models
-                    setattr(return_data, "_response_info", response_info)
+                    try:
+                        setattr(return_data, "_response_info", response_info)
+                    except (TypeError, AttributeError):
+                        pass
 
         if _return_http_data_only:
             return return_data
diff --git a/pinecone/openapi_support/asyncio_api_client.py b/pinecone/openapi_support/asyncio_api_client.py
index 58a3a869..92d6c580 100644
--- a/pinecone/openapi_support/asyncio_api_client.py
+++ b/pinecone/openapi_support/asyncio_api_client.py
@@ -3,6 +3,7 @@
 from urllib3.fields import RequestField
 
 import orjson
+import json
 from typing import Any
 
 
@@ -177,9 +178,25 @@ async def __call_api(
                 response_info = extract_response_info(headers)
                 if isinstance(return_data, dict):
                     return_data["_response_info"] = response_info
+                elif isinstance(return_data, str):
+                    if not return_data:
+                        return_data = {"_response_info": response_info}
+                    else:
+                        try:
+                            parsed = json.loads(return_data)
+                            if isinstance(parsed, dict):
+                                parsed["_response_info"] = response_info
+                                return_data = parsed
+                            else:
+                                return_data = {"_response_info": response_info}
+                        except (json.JSONDecodeError, ValueError):
+                            return_data = {"_response_info": response_info}
                 else:
                     # Dynamic attribute assignment on OpenAPI models
-                    setattr(return_data, "_response_info", response_info)
+                    try:
+                        setattr(return_data, "_response_info", response_info)
+                    except (TypeError, AttributeError):
+                        pass
 
         if _return_http_data_only:
             return return_data