diff --git a/litellm/passthrough/timeout_utils.py b/litellm/passthrough/timeout_utils.py
index 829277105e3..9284f7143b0 100644
--- a/litellm/passthrough/timeout_utils.py
+++ b/litellm/passthrough/timeout_utils.py
@@ -10,7 +10,6 @@ DEFAULT_PASS_THROUGH_REQUEST_TIMEOUT_SECONDS: Final = 600.0
 class _TimeoutFields(BaseModel):
     model_config = ConfigDict(frozen=True)
 
-    stream: bool = False
     stream_timeout: float | None = None
     timeout: float | None = None
     request_timeout: float | None = None
@@ -61,10 +60,11 @@ def resolve_llm_passthrough_timeout(
     kwargs stream_timeout -> litellm_params stream_timeout -> router_stream_timeout, then the
     non-streaming chain above.
     """
+    streaming: Final = bool((kwargs or {}).get("stream"))
     request: Final = _TimeoutFields.model_validate(kwargs or {})
     deployment: Final = _TimeoutFields.model_validate(litellm_params or {})
     stream_candidates: Final = (
-        (request.stream_timeout, deployment.stream_timeout, router_stream_timeout) if request.stream else ()
+        (request.stream_timeout, deployment.stream_timeout, router_stream_timeout) if streaming else ()
     )
     candidates: Final = (
         *stream_candidates,
diff --git a/tests/test_litellm/proxy/pass_through_endpoints/test_pass_through_endpoints.py b/tests/test_litellm/proxy/pass_through_endpoints/test_pass_through_endpoints.py
index 54336800db4..abff897c4f5 100644
--- a/tests/test_litellm/proxy/pass_through_endpoints/test_pass_through_endpoints.py
+++ b/tests/test_litellm/proxy/pass_through_endpoints/test_pass_through_endpoints.py
@@ -1175,6 +1175,20 @@ def test_resolve_llm_passthrough_timeout_stream_timeout_precedence():
     )
 
 
+@pytest.mark.parametrize(
+    "stream, expected",
+    [(None, 90.0), (0, 90.0), ("", 90.0), (1, 1800.0), ("yes", 1800.0)],
+)
+def test_resolve_llm_passthrough_timeout_reads_stream_by_truthiness(stream: object, expected: float):
+    assert (
+        resolve_llm_passthrough_timeout(
+            kwargs={"stream": stream},
+            litellm_params={"stream_timeout": 1800, "timeout": 90},
+        )
+        == expected
+    )
+
+
 @pytest.mark.asyncio
 async def test_pass_through_request_uses_resolved_timeout():
     with patch("litellm.proxy.proxy_server.proxy_logging_obj") as mock_proxy_logging: