diff --git a/tests/envs/test_parallel.py b/tests/envs/test_parallel.py
index 5b10889ad..6285135e9 100644
--- a/tests/envs/test_parallel.py
+++ b/tests/envs/test_parallel.py
@@ -21,14 +21,14 @@ async def test_parallel_sotopia_env() -> None:
         {
             "agent1": LLMAgent(
                 "agent1",
-                model_name="gpt-3.5-turbo",
+                model_name="gpt-4o-mini",
                 agent_profile=AgentProfile(
                     **{"first_name": "John", "last_name": "Doe"}
                 ),
             ),
             "agent2": LLMAgent(
                 "agent2",
-                model_name="gpt-3.5-turbo",
+                model_name="gpt-4o-mini",
                 agent_profile=AgentProfile(
                     **{"first_name": "Jane", "last_name": "Doe"}
                 ),
@@ -66,7 +66,7 @@ async def test_parallel_sotopia_env_script_writing_single_step() -> None:
         {
             "agent1": LLMAgent(
                 "agent1",
-                model_name="gpt-3.5-turbo",
+                model_name="gpt-4o-mini",
                 agent_profile=AgentProfile(
                     **{"first_name": "John", "last_name": "Doe"}
                 ),
@@ -74,7 +74,7 @@ async def test_parallel_sotopia_env_script_writing_single_step() -> None:
             ),
             "agent2": LLMAgent(
                 "agent2",
-                model_name="gpt-3.5-turbo",
+                model_name="gpt-4o-mini",
                 agent_profile=AgentProfile(
                     **{"first_name": "Jane", "last_name": "Doe"}
                 ),
diff --git a/tests/generation_utils/test_generation.py b/tests/generation_utils/test_generation.py
index af8ac7256..e7b91c336 100644
--- a/tests/generation_utils/test_generation.py
+++ b/tests/generation_utils/test_generation.py
@@ -17,7 +17,7 @@ async def test_agenerate_list_integer() -> None:
     """
     length, lower, upper = 5, -10, 10
     list_of_int = await agenerate(
-        "gpt-3.5-turbo",
+        "gpt-4o-mini",
         "{format_instructions}",
         {},
         ListOfIntOutputParser(length, (lower, upper)),
@@ -52,7 +52,7 @@ async def test_logging_behavior(caplog: Any) -> None:
     # Call the function under test
     caplog.set_level(15)
     await agenerate(
-        "gpt-3.5-turbo",
+        "gpt-4o-mini",
         "{format_instructions}",
         {},
         ListOfIntOutputParser(5, (-10, 10)),
diff --git a/tests/sampler/test_sampler.py b/tests/sampler/test_sampler.py
index 64e6f6ebf..7e723df74 100644
--- a/tests/sampler/test_sampler.py
+++ b/tests/sampler/test_sampler.py
@@ -77,7 +77,7 @@ def test_uniform_sampler() -> None:
         ],
     )
     env_params = {
-        "model_name": "gpt-3.5-turbo",
+        "model_name": "gpt-4o-mini",
         "action_order": "random",
         "evaluators": [
             RuleBasedTerminatedEvaluator(),
@@ -88,7 +88,7 @@ def test_uniform_sampler() -> None:
             agent_classes=[LLMAgent] * n_agent,
             n_agent=n_agent,
             env_params=env_params,
-            agents_params=[{"model_name": "gpt-3.5-turbo"}] * n_agent,
+            agents_params=[{"model_name": "gpt-4o-mini"}] * n_agent,
         )
     )
     agents = Agents({agent.agent_name: agent for agent in agent_list})
@@ -105,7 +105,7 @@ def test_constrain_sampler() -> None:
         env_candidates=[str(borrow_money.pk)]
     )
     env_params = {
-        "model_name": "gpt-3.5-turbo",
+        "model_name": "gpt-4o-mini",
         "action_order": "random",
         "evaluators": [
             RuleBasedTerminatedEvaluator(),
@@ -118,7 +118,7 @@ def test_constrain_sampler() -> None:
             replacement=False,
             size=2,
             env_params=env_params,
-            agents_params=[{"model_name": "gpt-3.5-turbo"}] * n_agent,
+            agents_params=[{"model_name": "gpt-4o-mini"}] * n_agent,
         )
     )
     agents = Agents({agent.agent_name: agent for agent in agent_list})
@@ -130,7 +130,7 @@ def test_constrain_sampler() -> None:
             replacement=True,
             size=2,
             env_params=env_params,
-            agents_params=[{"model_name": "gpt-3.5-turbo"}] * n_agent,
+            agents_params=[{"model_name": "gpt-4o-mini"}] * n_agent,
         )
     )
     agents = Agents({agent.agent_name: agent for agent in agent_list})