diff --git a/README.md b/README.md
index 925ad6e4d648..123925276179 100644
--- a/README.md
+++ b/README.md
@@ -89,6 +89,7 @@ from autogen import AssistantAgent, UserProxyAgent, config_list_from_json
 # See https://microsoft.github.io/autogen/docs/FAQ#set-your-api-endpoints
 # and OAI_CONFIG_LIST_sample
 config_list = config_list_from_json(env_or_file="OAI_CONFIG_LIST")
+# You can also set config_list directly as a list, for example, config_list = [{'model': 'gpt-4', 'api_key': '<your OpenAI API key here>'},]  
 assistant = AssistantAgent("assistant", llm_config={"config_list": config_list})
 user_proxy = UserProxyAgent("user_proxy", code_execution_config={"work_dir": "coding"})
 user_proxy.initiate_chat(assistant, message="Plot a chart of NVDA and TESLA stock price change YTD.")
diff --git a/autogen/oai/completion.py b/autogen/oai/completion.py
index f3ea897de6b6..54739ec5d2f3 100644
--- a/autogen/oai/completion.py
+++ b/autogen/oai/completion.py
@@ -1026,7 +1026,7 @@ def cost(cls, response: dict):
         Returns:
             The cost in USD. 0 if the model is not supported.
         """
-        model = response["model"]
+        model = response.get("model")
         if model not in cls.price1K:
             return 0
             # raise ValueError(f"Unknown model: {model}")