diff --git a/litellm/litellm_core_utils/completion_timeout.py b/litellm/litellm_core_utils/completion_timeout.py
index e1ece9170e2..73451fb3f86 100644
--- a/litellm/litellm_core_utils/completion_timeout.py
+++ b/litellm/litellm_core_utils/completion_timeout.py
@@ -26,9 +26,13 @@ class CompletionTimeout:
         ``kwargs["timeout"]``, ``kwargs["request_timeout"]``, then ``global_timeout``
         (e.g. :attr:`litellm.request_timeout` from proxy ``litellm_settings``), else ``600``.
 
-        Coerce :class:`httpx.Timeout` when the provider does not support it; map ``6000``
-        (:data:`~litellm.constants.DEFAULT_REQUEST_TIMEOUT_SECONDS`) to ``600`` for completion.
+        Coerce :class:`httpx.Timeout` when the provider does not support it. If the value
+        came only from ``global_timeout`` (no model/kwargs timeout) and equals ``6000``
+        (:data:`~litellm.constants.DEFAULT_REQUEST_TIMEOUT_SECONDS`), use ``600`` for
+        completion so chat calls do not inherit the long package default; explicit
+        ``model_timeout`` / kwargs values of ``6000`` are left unchanged.
         """
+        timeout_from_global_only = False
         if model_timeout is not None:
             resolved: Union[float, str, httpx.Timeout] = model_timeout
         elif kwargs.get("timeout") is not None:
@@ -37,6 +41,7 @@ class CompletionTimeout:
             resolved = kwargs["request_timeout"]
         else:
             resolved = global_timeout if global_timeout is not None else 600
+            timeout_from_global_only = True
 
         if isinstance(resolved, httpx.Timeout) and not supports_httpx_timeout(
             custom_llm_provider
@@ -48,8 +53,10 @@ class CompletionTimeout:
         elif not isinstance(resolved, httpx.Timeout):
             resolved = float(resolved)  # type: ignore
 
-        if not isinstance(resolved, httpx.Timeout) and float(resolved) == float(
-            DEFAULT_REQUEST_TIMEOUT_SECONDS
+        if (
+            timeout_from_global_only
+            and not isinstance(resolved, httpx.Timeout)
+            and float(resolved) == float(DEFAULT_REQUEST_TIMEOUT_SECONDS)
         ):
             resolved = 600.0
 
diff --git a/tests/test_litellm/test_completion_timeout_resolution.py b/tests/test_litellm/test_completion_timeout_resolution.py
index f2955852afe..b1ec32e6239 100644
--- a/tests/test_litellm/test_completion_timeout_resolution.py
+++ b/tests/test_litellm/test_completion_timeout_resolution.py
@@ -79,8 +79,8 @@ def test_global_timeout_package_default_coerced_to_600_for_completion():
     )
 
 
-def test_explicit_request_timeout_6000_normalized_to_completion_default():
-    """6000 is the package sentinel; completion always uses 600 instead."""
+def test_explicit_request_timeout_6000_preserved():
+    """Explicit deployment/request timeout must not be truncated by the package sentinel."""
     assert (
         CompletionTimeout.resolve(
             None,
@@ -89,7 +89,20 @@ def test_explicit_request_timeout_6000_normalized_to_completion_default():
             global_timeout=None,
             supports_httpx_timeout=supports_httpx_timeout,
         )
-        == 600.0
+        == 6000.0
+    )
+
+
+def test_explicit_model_timeout_6000_preserved():
+    assert (
+        CompletionTimeout.resolve(
+            6000.0,
+            {"timeout": 1.0, "request_timeout": 2.0},
+            "openai",
+            global_timeout=None,
+            supports_httpx_timeout=supports_httpx_timeout,
+        )
+        == 6000.0
     )