fix: coerce numeric API error codes to strings

src/openai/_exceptions.py

@@ -58,7 +58,8 @@ def __init__(self, message: str, request: httpx.Request, *, body: object | None)
         self.body = body
 
         if is_dict(body):
-            self.code = cast(Any, construct_type(type_=Optional[str], value=body.get("code")))
+            code = body.get("code")
+            self.code = str(code) if 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:

tests/test_exceptions.py

@@ -0,0 +1,12 @@
+import httpx
+
+from openai import APIStatusError
+
+
+def test_integer_error_code_is_coerced_to_string() -> None:
+    request = httpx.Request("GET", "https://api.openai.com/v1/models")
+    response = httpx.Response(404, request=request)
+
+    error = APIStatusError("Not found", response=response, body={"code": 404})
+
+    assert error.code == "404"