diff --git a/tests/test_litellm/conftest.py b/tests/test_litellm/conftest.py
index 0dc8f56f3ce..2f3f20e79ad 100644
--- a/tests/test_litellm/conftest.py
+++ b/tests/test_litellm/conftest.py
@@ -272,6 +272,9 @@ def isolate_litellm_state():
         litellm.in_memory_llm_clients_cache.flush_cache()
     image_handling_module.in_memory_cache.flush_cache()
     _reset_module_level_aws_auth_caches()
+    # litellm.get_model_info() memoizes ModelInfo built from litellm.model_cost, so a
+    # test that rebinds the cost map leaves later tests pricing against the old map.
+    litellm_utils_module._invalidate_model_cost_lowercase_map()
 
     # Clear all callback lists to prevent cross-test contamination
     if hasattr(litellm, "callbacks"):
@@ -315,6 +318,7 @@ def isolate_litellm_state():
 
     litellm_utils_module._runtime_registered_model_cost.clear()
     litellm_utils_module._runtime_registered_model_cost.update(original_runtime_registered_model_cost)
+    litellm_utils_module._invalidate_model_cost_lowercase_map()
 
     for _router in tuple(litellm_router_module._live_routers):
         litellm_router_module._live_routers.discard(_router)