diff --git a/src/openai/_exceptions.py b/src/openai/_exceptions.py
index 7a30e4a336..5f5f911faf 100644
--- a/src/openai/_exceptions.py
+++ b/src/openai/_exceptions.py
@@ -69,7 +69,8 @@ def __init__(self, message: str, request: httpx2.Request, *, body: object | None
         self.body = body
 
         if is_dict(body):
-            self.code = cast(Any, construct_type(type_=Optional[str], value=body.get("code")))
+            raw_code = body.get("code")
+            self.code = str(raw_code) if raw_code is not None else None
             self.param = cast(Any, construct_type(type_=Optional[str], value=body.get("param")))
             self.type = cast(Any, construct_type(type_=str, value=body.get("type")))
         else:
diff --git a/src/openai/auth/_workload.py b/src/openai/auth/_workload.py
index 4f9797f092..f8d047ac1e 100644
--- a/src/openai/auth/_workload.py
+++ b/src/openai/auth/_workload.py
@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+import math
 import time
 import threading
 from typing import Any, Generic, TypeVar, Callable, TypedDict, cast
@@ -305,8 +306,10 @@ def _handle_token_response(self, response: httpx2.Response) -> dict[str, Any]:
         )
 
     def _validate_expires_in(self, expires_in: object) -> float:
-        if not isinstance(expires_in, (int, float)):
-            raise OpenAIError("Token exchange response did not include a valid expires_in")
+        if isinstance(expires_in, bool):
+            expires_in = int(expires_in)
+        if not isinstance(expires_in, (int, float)) or math.isnan(expires_in) or math.isinf(expires_in) or expires_in <= 0:
+            raise ValueError("Token exchange response did not include a valid expires_in")
         return float(expires_in)
 
     def _token_unusable(self) -> bool: