[Python] What is the default value of temperature parameter in ChatOpenAI in Langchain?

What is the default value of the temperature parameter when I create an instance of ChatOpenAI in Langchain?

from langchain_openai import ChatOpenAI

llm = ChatOpenAI(model="gpt-4o")
print(llm.temperature) # it is None!

llm=ChatOpenAI(model="gpt-4o", temperature=0.1)
print(llm.temperature) # it is 0.1


when I don't explicitly set a value to temperature it would be None! so what does it mean? is it Zero or One in this case?

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