diff --git a/flexeval/core/language_model/litellm_api.py b/flexeval/core/language_model/litellm_api.py
index 37f8ac55..c55091ce 100644
--- a/flexeval/core/language_model/litellm_api.py
+++ b/flexeval/core/language_model/litellm_api.py
@@ -75,9 +75,13 @@ def __init__(
             model_response_object=ModelResponse(),
         )
         self.ignore_seed = ignore_seed
+        if self.ignore_seed and "seed" in self.default_gen_kwargs:
+            self.default_gen_kwargs.pop("seed")
         self.api_call_func = completion
 
     def set_random_seed(self, seed: int) -> None:
+        if self.ignore_seed:
+            return
         self.default_gen_kwargs["seed"] = seed
 
     def _batch_complete_text(
diff --git a/tests/core/language_model/test_litellm_api.py b/tests/core/language_model/test_litellm_api.py
index 8786f801..89415733 100644
--- a/tests/core/language_model/test_litellm_api.py
+++ b/tests/core/language_model/test_litellm_api.py
@@ -115,3 +115,28 @@ def test_if_not_ignore_seed() -> None:
 def test_set_random_seed(chat_lm: OpenAIChatAPI) -> None:
     chat_lm.set_random_seed(42)
     assert chat_lm.default_gen_kwargs["seed"] == 42
+
+
+@pytest.mark.skipif(not is_openai_enabled(), reason="OpenAI is not installed")
+def test_set_random_seed_is_noop_when_ignore_seed() -> None:
+    chat_lm = LiteLLMChatAPI(MODEL_NAME, ignore_seed=True)
+    chat_lm.set_random_seed(42)
+    assert "seed" not in chat_lm.default_gen_kwargs
+
+
+@pytest.mark.skipif(not is_openai_enabled(), reason="OpenAI is not installed")
+def test_ignore_seed_removes_seed_from_default_gen_kwargs() -> None:
+    chat_lm = LiteLLMChatAPI(MODEL_NAME, default_gen_kwargs={"seed": 42, "temperature": 0.0}, ignore_seed=True)
+    assert "seed" not in chat_lm.default_gen_kwargs
+    assert chat_lm.default_gen_kwargs["temperature"] == 0.0
+
+
+@pytest.mark.skipif(not is_openai_enabled(), reason="OpenAI is not installed")
+def test_if_ignore_seed_after_set_random_seed() -> None:
+    chat_lm = LiteLLMChatAPI(MODEL_NAME, ignore_seed=True)
+    chat_lm.set_random_seed(42)
+    chat_messages = [{"role": "user", "content": "Hello"}]
+    with patch.object(OpenAIChatAPI, "_batch_generate_chat_response", return_value=[LMOutput("Hello!")]) as mock_method:
+        chat_lm.generate_chat_response(chat_messages, temperature=0.7)
+        # `seed` should not be passed even though set_random_seed() was called
+        mock_method.assert_called_once_with([chat_messages], [None], temperature=0.7)