diff --git a/src/openai/resources/audio/speech.py b/src/openai/resources/audio/speech.py
index 4e94d4aaef..fbdc1ecff1 100644
--- a/src/openai/resources/audio/speech.py
+++ b/src/openai/resources/audio/speech.py
@@ -78,6 +78,7 @@ def create(
 
           timeout: Override the client-level default timeout for this request, in seconds
         """
+        extra_headers = {"Accept": "application/octet-stream", **(extra_headers or {})}
         return self._post(
             "/audio/speech",
             body=maybe_transform(
@@ -149,6 +150,7 @@ async def create(
 
           timeout: Override the client-level default timeout for this request, in seconds
         """
+        extra_headers = {"Accept": "application/octet-stream", **(extra_headers or {})}
         return await self._post(
             "/audio/speech",
             body=maybe_transform(
diff --git a/src/openai/resources/files.py b/src/openai/resources/files.py
index 58a2a217c7..8b2bc4f181 100644
--- a/src/openai/resources/files.py
+++ b/src/openai/resources/files.py
@@ -238,6 +238,7 @@ def content(
         """
         if not file_id:
             raise ValueError(f"Expected a non-empty value for `file_id` but received {file_id!r}")
+        extra_headers = {"Accept": "application/binary", **(extra_headers or {})}
         return self._get(
             f"/files/{file_id}/content",
             options=make_request_options(
@@ -272,7 +273,6 @@ def retrieve_content(
         """
         if not file_id:
             raise ValueError(f"Expected a non-empty value for `file_id` but received {file_id!r}")
-        extra_headers = {"Accept": "application/json", **(extra_headers or {})}
         return self._get(
             f"/files/{file_id}/content",
             options=make_request_options(
@@ -511,6 +511,7 @@ async def content(
         """
         if not file_id:
             raise ValueError(f"Expected a non-empty value for `file_id` but received {file_id!r}")
+        extra_headers = {"Accept": "application/binary", **(extra_headers or {})}
         return await self._get(
             f"/files/{file_id}/content",
             options=make_request_options(
@@ -545,7 +546,6 @@ async def retrieve_content(
         """
         if not file_id:
             raise ValueError(f"Expected a non-empty value for `file_id` but received {file_id!r}")
-        extra_headers = {"Accept": "application/json", **(extra_headers or {})}
         return await self._get(
             f"/files/{file_id}/content",
             options=make_request_options(