diff --git a/litellm/llms/gigachat/chat/transformation.py b/litellm/llms/gigachat/chat/transformation.py
index 6d75c311084..20251d7ef9a 100644
--- a/litellm/llms/gigachat/chat/transformation.py
+++ b/litellm/llms/gigachat/chat/transformation.py
@@ -124,14 +124,16 @@ class GigaChatConfig(BaseConfig):
         return headers
 
     def get_supported_openai_params(self, model: str) -> list[str]:
-        """Return list of supported OpenAI parameters."""
+        """Return list of supported OpenAI parameters.
+
+        No stop: the GigaChat request body has no stop field.
+        """
         return [
             "stream",
             "temperature",
             "top_p",
             "max_tokens",
             "max_completion_tokens",
-            "stop",
             "tools",
             "tool_choice",
             "functions",
@@ -160,9 +162,6 @@ class GigaChatConfig(BaseConfig):
                 optional_params["top_p"] = value
             elif param in ("max_tokens", "max_completion_tokens"):
                 optional_params["max_tokens"] = value
-            elif param == "stop":
-                # GigaChat doesn't support stop sequences
-                pass
             elif param == "tools":
                 # Convert tools to functions format
                 optional_params["functions"] = self._convert_tools_to_functions(value)
diff --git a/tests/llm_translation/test_gigachat.py b/tests/llm_translation/test_gigachat.py
index 3c47f692ce0..2ebfacbb69e 100644
--- a/tests/llm_translation/test_gigachat.py
+++ b/tests/llm_translation/test_gigachat.py
@@ -359,6 +359,36 @@ class TestGigaChatSupportedParams:
         assert "response_format" in supported
         assert "stream" in supported
 
+    def test_stop_not_supported(self, config):
+        """GigaChat has no stop sequences, so it must not claim `stop`.
+
+        Claiming it suppresses the UnsupportedParamsError users rely on and the
+        sequences are dropped without any warning.
+        """
+        assert "stop" not in config.get_supported_openai_params("GigaChat")
+
+    def test_stop_raises_instead_of_being_dropped(self, config):
+        """Passing stop should surface an error, not vanish."""
+        import litellm
+        from litellm.utils import get_optional_params
+
+        with pytest.raises(litellm.UnsupportedParamsError):
+            get_optional_params(
+                model="GigaChat", custom_llm_provider="gigachat", stop=["END"]
+            )
+
+    def test_stop_still_droppable(self, config):
+        """With drop_params on, stop is dropped quietly - the documented escape."""
+        from litellm.utils import get_optional_params
+
+        params = get_optional_params(
+            model="GigaChat",
+            custom_llm_provider="gigachat",
+            stop=["END"],
+            drop_params=True,
+        )
+        assert "stop" not in params
+
 
 class TestGigaChatToolChoiceMapping:
     """Tests for tool_choice -> function_call mapping"""