diff --git a/src/openai/resources/responses/responses.py b/src/openai/resources/responses/responses.py
index 0a89d0c18e..1e20c05924 100644
--- a/src/openai/resources/responses/responses.py
+++ b/src/openai/resources/responses/responses.py
@@ -2,6 +2,7 @@
 
 from __future__ import annotations
 
+from copy import copy
 from typing import Any, List, Type, Union, Iterable, Optional, cast
 from functools import partial
 from typing_extensions import Literal, overload
@@ -1011,6 +1012,7 @@ def stream(
                 if "format" in text:
                     raise TypeError("Cannot mix and match text.format with text_format")
 
+                text = copy(text)
                 text["format"] = _type_to_text_format_param(text_format)
 
             api_request: partial[Stream[ResponseStreamEvent]] = partial(
@@ -1114,7 +1116,7 @@ def parse(
 
             if "format" in text:
                 raise TypeError("Cannot mix and match text.format with text_format")
-
+            text = copy(text)
             text["format"] = _type_to_text_format_param(text_format)
 
         tools = _make_tools(tools)
@@ -2442,7 +2444,7 @@ def stream(
 
                 if "format" in text:
                     raise TypeError("Cannot mix and match text.format with text_format")
-
+                text = copy(text)
                 text["format"] = _type_to_text_format_param(text_format)
 
             api_request = self.create(
@@ -2550,7 +2552,7 @@ async def parse(
 
             if "format" in text:
                 raise TypeError("Cannot mix and match text.format with text_format")
-
+            text = copy(text)
             text["format"] = _type_to_text_format_param(text_format)
 
         tools = _make_tools(tools)