diff --git a/google/genai/_interactions/_base_client.py b/google/genai/_interactions/_base_client.py
index 71453670f..369168ff3 100644
--- a/google/genai/_interactions/_base_client.py
+++ b/google/genai/_interactions/_base_client.py
@@ -456,7 +456,7 @@ def _make_status_error(
     ) -> _exceptions.APIStatusError:
         raise NotImplementedError()
 
-    def _build_headers(self, options: FinalRequestOptions, *, retries_taken: int = 0) -> httpx.Headers:
+    def _build_headers(self, options: FinalRequestOptions) -> httpx.Headers:
         custom_headers = options.headers or {}
         headers_dict = _merge_mappings(self.default_headers, custom_headers)
         self._validate_headers(headers_dict, custom_headers)
@@ -468,18 +468,6 @@ def _build_headers(self, options: FinalRequestOptions, *, retries_taken: int = 0
         if idempotency_header and options.idempotency_key and idempotency_header not in headers:
             headers[idempotency_header] = options.idempotency_key
 
-        # Don't set these headers if they were already set or removed by the caller. We check
-        # `custom_headers`, which can contain `Omit()`, instead of `headers` to account for the removal case.
-        lower_custom_headers = [header.lower() for header in custom_headers]
-        if "x-stainless-retry-count" not in lower_custom_headers:
-            headers["x-stainless-retry-count"] = str(retries_taken)
-        if "x-stainless-read-timeout" not in lower_custom_headers:
-            timeout = self.timeout if isinstance(options.timeout, NotGiven) else options.timeout
-            if isinstance(timeout, Timeout):
-                timeout = timeout.read
-            if timeout is not None:
-                headers["x-stainless-read-timeout"] = str(timeout)
-
         return headers
 
     def _prepare_url(self, url: str) -> URL:
@@ -501,8 +489,6 @@ def _make_sse_decoder(self) -> SSEDecoder | SSEBytesDecoder:
     def _build_request(
         self,
         options: FinalRequestOptions,
-        *,
-        retries_taken: int = 0,
     ) -> httpx.Request:
         if log.isEnabledFor(logging.DEBUG):
             log.debug(
@@ -529,7 +515,7 @@ def _build_request(
             else:
                 raise RuntimeError(f"Unexpected JSON data type, {type(json_data)}, cannot merge with `extra_body`")
 
-        headers = self._build_headers(options, retries_taken=retries_taken)
+        headers = self._build_headers(options)
         params = _merge_mappings(self.default_query, options.params)
         content_type = headers.get("Content-Type")
         files = options.files
@@ -694,7 +680,6 @@ def default_headers(self) -> dict[str, str | Omit]:
             "Accept": "application/json",
             "Content-Type": "application/json",
             "User-Agent": self.user_agent,
-            **self.platform_headers(),
             **self.auth_headers,
             **self._custom_headers,
         }
@@ -1010,7 +995,7 @@ def request(
             options = self._prepare_options(options)
 
             remaining_retries = max_retries - retries_taken
-            request = self._build_request(options, retries_taken=retries_taken)
+            request = self._build_request(options)
             self._prepare_request(request)
 
             kwargs: HttpxSendArgs = {}
@@ -1594,7 +1579,7 @@ async def request(
             options = await self._prepare_options(options)
 
             remaining_retries = max_retries - retries_taken
-            request = self._build_request(options, retries_taken=retries_taken)
+            request = self._build_request(options)
             await self._prepare_request(request)
 
             kwargs: HttpxSendArgs = {}
diff --git a/google/genai/_interactions/_client.py b/google/genai/_interactions/_client.py
index 64bc99587..ff92c7a91 100644
--- a/google/genai/_interactions/_client.py
+++ b/google/genai/_interactions/_client.py
@@ -35,7 +35,7 @@
     RequestOptions,
     not_given,
 )
-from ._utils import is_given, get_async_library
+from ._utils import is_given
 from ._compat import cached_property
 from ._models import FinalRequestOptions
 from ._version import __version__
@@ -159,7 +159,6 @@ def auth_headers(self) -> dict[str, str]:
     def default_headers(self) -> dict[str, str | Omit]:
         return {
             **super().default_headers,
-            "X-Stainless-Async": "false",
             **self._custom_headers,
         }
 
@@ -381,7 +380,6 @@ def auth_headers(self) -> dict[str, str]:
     def default_headers(self) -> dict[str, str | Omit]:
         return {
             **super().default_headers,
-            "X-Stainless-Async": f"async:{get_async_library()}",
             **self._custom_headers,
         }