diff --git a/tests/e2e/llm_translation/test_deepseek_reasoning_e2e.py b/tests/e2e/llm_translation/test_deepseek_reasoning_e2e.py
index 8dfccf0d74b..ad808048c0b 100644
--- a/tests/e2e/llm_translation/test_deepseek_reasoning_e2e.py
+++ b/tests/e2e/llm_translation/test_deepseek_reasoning_e2e.py
@@ -29,6 +29,7 @@ pytestmark = pytest.mark.e2e
 
 REASONER = "deepseek/deepseek-v4-pro"
 PROMPT = "What is 17 + 26? Answer with just the number."
+REASONER_TIMEOUT_SECONDS = 240.0
 
 
 def _register_reasoner(client: PassthroughClient, resources: ResourceManager) -> str:
@@ -63,6 +64,7 @@ class TestDeepSeekReasoningDisable:
                     messages=[ChatMessage(role="user", content=PROMPT)],
                     max_tokens=64,
                 ),
+                timeout=REASONER_TIMEOUT_SECONDS,
             )
         )
         reasoning = _reasoning_content(response)
@@ -86,6 +88,7 @@ class TestDeepSeekReasoningDisable:
                     max_tokens=64,
                     reasoning_effort="none",
                 ),
+                timeout=REASONER_TIMEOUT_SECONDS,
             )
         )
         assert not _reasoning_content(response), (
@@ -108,6 +111,7 @@ class TestDeepSeekReasoningDisable:
                     max_tokens=64,
                     thinking=ThinkingParam(type="disabled"),
                 ),
+                timeout=REASONER_TIMEOUT_SECONDS,
             )
         )
         assert not _reasoning_content(response), (
diff --git a/tests/e2e/proxy_client.py b/tests/e2e/proxy_client.py
index 2627bdb8038..7dc8d204498 100644
--- a/tests/e2e/proxy_client.py
+++ b/tests/e2e/proxy_client.py
@@ -269,12 +269,13 @@ class ProxyClient:
 
     # ---- LLM calls ------------------------------------------------------
 
-    def chat(self, key: str, body: ChatBody) -> Result[ChatResponse]:
+    def chat(self, key: str, body: ChatBody, timeout: float | None = None) -> Result[ChatResponse]:
         return self.transport.post(
             "/chat/completions",
             headers=self.transport.bearer(key),
             json=body,
             response_type=ChatResponse,
+            timeout=timeout,
         )
 
     def chat_stream(self, key: str, body: ChatBody) -> StreamingResponse:
diff --git a/tests/e2e/transport.py b/tests/e2e/transport.py
index a6adf83ed1f..a4cae262b91 100644
--- a/tests/e2e/transport.py
+++ b/tests/e2e/transport.py
@@ -25,7 +25,13 @@ from e2e_http import (
 
 class Transport(Protocol):
     def post[R: BaseModel](
-        self, path: str, *, headers: BaseModel, json: BaseModel, response_type: type[R]
+        self,
+        path: str,
+        *,
+        headers: BaseModel,
+        json: BaseModel,
+        response_type: type[R],
+        timeout: float | None = None,
     ) -> Result[R]: ...
 
     def stream(
@@ -119,14 +125,20 @@ class HttpTransport:
         return self.bearer(self.master_key)
 
     def post[R: BaseModel](
-        self, path: str, *, headers: BaseModel, json: BaseModel, response_type: type[R]
+        self,
+        path: str,
+        *,
+        headers: BaseModel,
+        json: BaseModel,
+        response_type: type[R],
+        timeout: float | None = None,
     ) -> Result[R]:
         return e2e_http.post(
             self._url(path),
             headers=headers,
             json=json,
             response_type=response_type,
-            timeout=self.request_timeout,
+            timeout=timeout if timeout is not None else self.request_timeout,
         )
 
     def get[R: BaseModel](
@@ -323,10 +335,16 @@ class SplitTransport:
         return self.data.master
 
     def post[R: BaseModel](
-        self, path: str, *, headers: BaseModel, json: BaseModel, response_type: type[R]
+        self,
+        path: str,
+        *,
+        headers: BaseModel,
+        json: BaseModel,
+        response_type: type[R],
+        timeout: float | None = None,
     ) -> Result[R]:
         return self._route(path).post(
-            path, headers=headers, json=json, response_type=response_type
+            path, headers=headers, json=json, response_type=response_type, timeout=timeout
         )
 
     def get[R: BaseModel](