CODEWITHSUNDEEP
pythonopenai-apilangchain
Benjamin Geoffrey
Benjamin Geoffrey

Reputation: 163

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?

Upvotes: 0

Views: 39

Answers (1)

Aryan Raj
Aryan Raj

Reputation: 292

The default value of temperature when creating a ChatOpenAI instance in LangChain is actually 0.7, not None.

When you see None printed, it doesn't mean the actual temperature being used is None. What's happening is that LangChain uses a lazy-loading pattern where some parameters are only set when actually needed (typically at request time).

Here's what's going on:

from langchain_openai import ChatOpenAI

llm = ChatOpenAI(model="gpt-4o")
print(llm.temperature)  # Prints None, but actual default is 0.7

llm=ChatOpenAI(model="gpt-4o", temperature=0.1)
print(llm.temperature)  # Prints 0.1 as expected

You can verify this by checking the source code or by actually making a call with the model and inspecting the request that gets sent to OpenAI.

If you look at the implementation, you'll see that when you don't specify a temperature, it uses a default of 0.7 when making the actual API call - this is consistent with OpenAI's own default.

This is a standard design pattern in many libraries where parameters are only fully initialized at runtime rather than at instantiation time.

Upvotes: 0

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