Articles → LANGCHAIN → Invoke Your First Openai LLM Model Using Langchain

Invoke Your First Openai LLM Model Using Langchain

This article explains how to invoke your first OpenAI LLM model using Langchain.

Create .ENV File

To begin with, create a new file with the name .env. Add your OpenAI secret key.

OPEN_API_KEY="[your_key]"

Create Your First Program

import osos.environ["OPENAI_API_KEY"] ="[your_key]"from langchain_openai import ChatOpenAIllm = ChatOpenAI(    api_key=os.environ["OPENAI_API_KEY"],    model="gpt-4.1-mini",    temperature=0.6)text="what is the capital of india"response = llm.invoke(text)print(response.content)

Output

Posted By -	Karan Gupta

Posted On -	Monday, May 11, 2026

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