diff --git a/metagpt/provider/base_gpt_api.py b/metagpt/provider/base_gpt_api.py
index f39e708eb..f1590a77c 100644
--- a/metagpt/provider/base_gpt_api.py
+++ b/metagpt/provider/base_gpt_api.py
@@ -4,6 +4,7 @@
 @Time    : 2023/5/5 23:04
 @Author  : alexanderwu
 @File    : base_gpt_api.py
+@Desc    : mashenquan, 2023/8/22. + try catch
 """
 from abc import abstractmethod
 from typing import Optional
@@ -41,7 +42,11 @@ class BaseGPTAPI(BaseChatbot):
             message = self._system_msgs(system_msgs) + [self._user_msg(msg)]
         else:
             message = [self._default_system_msg(), self._user_msg(msg)]
-        rsp = await self.acompletion_text(message, stream=True)
+        try:
+            rsp = await self.acompletion_text(message, stream=True)
+        except Exception as e:
+            logger.exception(f"{e}")
+            raise e
         logger.debug(message)
         # logger.debug(rsp)
         return rsp
diff --git a/metagpt/provider/openai_api.py b/metagpt/provider/openai_api.py
index 2e951b36f..abfb796f3 100644
--- a/metagpt/provider/openai_api.py
+++ b/metagpt/provider/openai_api.py
@@ -8,10 +8,11 @@
 """
 import asyncio
 import time
-from typing import NamedTuple
+from typing import NamedTuple, Dict
 
 import openai
 from openai.error import APIConnectionError
+from pydantic import BaseModel
 from tenacity import retry, stop_after_attempt, after_log, wait_fixed, retry_if_exception_type
 
 from metagpt.logs import logger
@@ -35,7 +36,7 @@ class RateLimiter:
         self.rpm = rpm
 
     def split_batches(self, batch):
-        return [batch[i : i + self.rpm] for i in range(0, len(batch), self.rpm)]
+        return [batch[i: i + self.rpm] for i in range(0, len(batch), self.rpm)]
 
     async def wait_if_needed(self, num_requests):
         current_time = time.time()
@@ -56,14 +57,14 @@ class Costs(NamedTuple):
     total_budget: float
 
 
-class CostManager:
+class CostManager(BaseModel):
     """计算使用接口的开销"""
 
-    def __init__(self, options):
-        self.total_prompt_tokens = 0
-        self.total_completion_tokens = 0
-        self.options = options
-        self.total_budget = 0
+    total_prompt_tokens: int = 0
+    total_completion_tokens: int = 0
+    total_budget: int = 0
+    max_budget: int
+    total_cost: int = 0
 
     def update_cost(self, prompt_tokens, completion_tokens, model):
         """
@@ -76,7 +77,8 @@ class CostManager:
         """
         self.total_prompt_tokens += prompt_tokens
         self.total_completion_tokens += completion_tokens
-        cost = (prompt_tokens * TOKEN_COSTS[model]["prompt"] + completion_tokens * TOKEN_COSTS[model]["completion"]) / 1000
+        cost = (prompt_tokens * TOKEN_COSTS[model]["prompt"] + completion_tokens * TOKEN_COSTS[model][
+            "completion"]) / 1000
         self.total_cost += cost
         logger.info(
             f"Total running cost: ${self.total_cost:.3f} | Max budget: ${self.max_budget:.3f} | "
@@ -114,18 +116,6 @@ class CostManager:
         """获得所有开销"""
         return Costs(self.total_prompt_tokens, self.total_completion_tokens, self.total_cost, self.total_budget)
 
-    @property
-    def total_cost(self):
-        return self.options.get("total_cost", 0)
-
-    @total_cost.setter
-    def total_cost(self, v):
-        self.options["total_cost"] = v
-
-    @property
-    def max_budget(self):
-        return self.options.get("max_budget", 0)
-
 
 def log_and_reraise(retry_state):
     logger.error(f"Retry attempts exhausted. Last exception: {retry_state.outcome.exception()}")
diff --git a/metagpt/schema.py b/metagpt/schema.py
index f45d1e36d..56e9ad95c 100644
--- a/metagpt/schema.py
+++ b/metagpt/schema.py
@@ -9,7 +9,7 @@
 from __future__ import annotations
 
 from dataclasses import dataclass, field
-from enum import StrEnum
+from enum import Enum
 from typing import Type, TypedDict, Set, Optional
 
 from pydantic import BaseModel
@@ -17,7 +17,7 @@ from pydantic import BaseModel
 from metagpt.logs import logger
 
 
-class MessageTag(StrEnum):
+class MessageTag(Enum):
     Prerequisite = "prerequisite"
 
 
diff --git a/metagpt/software_company.py b/metagpt/software_company.py
index 3f6f484b4..87b24a1cb 100644
--- a/metagpt/software_company.py
+++ b/metagpt/software_company.py
@@ -30,7 +30,7 @@ class SoftwareCompany(BaseModel):
     investment: float = Field(default=10.0)
     idea: str = Field(default="")
     options: Dict = Field(default=Config().runtime_options)
-    cost_manager: CostManager = Field(default=CostManager(Config().runtime_options))
+    cost_manager: CostManager = Field(default=CostManager(**Config().runtime_options))
 
     class Config:
         arbitrary_types_allowed = True
diff --git a/tests/metagpt/actions/test_write_code.py b/tests/metagpt/actions/test_write_code.py
index 04216ad7c..9861fd4cd 100644
--- a/tests/metagpt/actions/test_write_code.py
+++ b/tests/metagpt/actions/test_write_code.py
@@ -19,7 +19,7 @@ from tests.metagpt.actions.mock import TASKS_2, WRITE_CODE_PROMPT_SAMPLE
 async def test_write_code():
     api_design = "设计一个名为'add'的函数，该函数接受两个整数作为输入，并返回它们的和。"
     conf = Config()
-    cost_manager = CostManager(conf.runtime_options)
+    cost_manager = CostManager(**conf.runtime_options)
     llm = LLM(options=conf.runtime_options, cost_manager=cost_manager)
     write_code = WriteCode(options=conf.runtime_options, name="write_code", llm=llm)
 
@@ -35,6 +35,6 @@ async def test_write_code():
 async def test_write_code_directly():
     prompt = WRITE_CODE_PROMPT_SAMPLE + '\n' + TASKS_2[0]
     options = Config().runtime_options
-    llm = LLM(options=options, cost_manager=CostManager(options=options))
+    llm = LLM(options=options, cost_manager=CostManager(**options))
     rsp = await llm.aask(prompt)
     logger.info(rsp)
diff --git a/tests/metagpt/test_environment.py b/tests/metagpt/test_environment.py
index d10c93ec0..57650d145 100644
--- a/tests/metagpt/test_environment.py
+++ b/tests/metagpt/test_environment.py
@@ -26,7 +26,7 @@ def env():
 
 def test_add_role(env: Environment):
     conf = Config()
-    cost_manager = CostManager(options=conf.runtime_options)
+    cost_manager = CostManager(**conf.runtime_options)
     role = ProductManager(options=conf.runtime_options,
                           cost_manager=cost_manager,
                           name="Alice",
@@ -39,7 +39,7 @@ def test_add_role(env: Environment):
 
 def test_get_roles(env: Environment):
     conf = Config()
-    cost_manager = CostManager(options=conf.runtime_options)
+    cost_manager = CostManager(**conf.runtime_options)
     role1 = Role(options=conf.runtime_options, cost_manager=cost_manager, name="Alice", profile="product manager",
                  goal="create a new product", constraints="limited resources")
     role2 = Role(options=conf.runtime_options, cost_manager=cost_manager, name="Bob", profile="engineer",
@@ -53,7 +53,7 @@ def test_get_roles(env: Environment):
 @pytest.mark.asyncio
 async def test_publish_and_process_message(env: Environment):
     conf = Config()
-    cost_manager = CostManager(options=conf.runtime_options)
+    cost_manager = CostManager(**conf.runtime_options)
     product_manager = ProductManager(options=conf.runtime_options,
                                      cost_manager=cost_manager,
                                      name="Alice", profile="Product Manager",
diff --git a/tests/metagpt/test_llm.py b/tests/metagpt/test_llm.py
index 77de6df0c..f61793151 100644
--- a/tests/metagpt/test_llm.py
+++ b/tests/metagpt/test_llm.py
@@ -16,7 +16,7 @@ from metagpt.provider.openai_api import OpenAIGPTAPI as LLM, CostManager
 @pytest.fixture()
 def llm():
     options = Config().runtime_options
-    return LLM(options=options, cost_manager=CostManager(options))
+    return LLM(options=options, cost_manager=CostManager(**options))
 
 
 @pytest.mark.asyncio