diff --git a/metagpt/utils/cost_manager.py b/metagpt/utils/cost_manager.py
index 921fbe6cd..b871cef3b 100644
--- a/metagpt/utils/cost_manager.py
+++ b/metagpt/utils/cost_manager.py
@@ -15,7 +15,6 @@ from metagpt.logs import logger
 from metagpt.utils.token_counter import FIREWORKS_GRADE_TOKEN_COSTS, TOKEN_COSTS
 
 
-
 class Costs(NamedTuple):
     total_prompt_tokens: int
     total_completion_tokens: int
@@ -145,4 +144,4 @@ class FireworksCostManager(CostManager):
         logger.info(
             f"Total running cost: ${self.total_cost:.4f}"
             f"Current cost: ${cost:.4f}, prompt_tokens: {prompt_tokens}, completion_tokens: {completion_tokens}"
-        )
\ No newline at end of file
+        )