Connecting to OpenAI models in LangChain - Mini Project: Build & Apply

Connecting to OpenAI models

📖 Scenario: You want to build a simple program that connects to OpenAI's language models using LangChain. This will help you send a prompt and get a response from the AI.

🎯 Goal: Create a Python script that sets up the OpenAI API client with LangChain, configures the model, sends a prompt, and receives the AI's response.

📋 What You'll Learn

Create a variable called api_key with your OpenAI API key as a string

Create an OpenAI client instance called llm using LangChain's OpenAI class with the api_key

Create a prompt string variable called prompt with the text 'Hello, how are you?'

Use the llm instance to generate a response from the prompt and store it in a variable called response

💡 Why This Matters

🌍 Real World

Connecting to OpenAI models is essential for building AI-powered chatbots, content generators, and other intelligent applications.

💼 Career

Many software development roles require integrating AI services like OpenAI to enhance user experiences and automate tasks.

1

Set up the OpenAI API key

Create a variable called api_key and assign it the string value 'your-openai-api-key'.

LangChain

# Your code here

Need a hint?

Use a string to store your API key exactly as 'your-openai-api-key'.

2

Create the OpenAI client instance

Import OpenAI from langchain.llms and create a variable called llm by calling OpenAI(openai_api_key=api_key).

LangChain

api_key = 'your-openai-api-key'
# Your code here

Need a hint?

Make sure to import OpenAI from langchain.llms before creating the client.

3

Create the prompt string

Create a variable called prompt and assign it the string 'Hello, how are you?'.

LangChain

api_key = 'your-openai-api-key'
from langchain.llms import OpenAI

llm = OpenAI(openai_api_key=api_key)
# Your code here

Need a hint?

Use a simple string variable to hold the prompt text.

4

Generate the response from the model

Call the llm instance with the prompt and assign the result to a variable called response.

LangChain

api_key = 'your-openai-api-key'
from langchain.llms import OpenAI

llm = OpenAI(openai_api_key=api_key)

prompt = 'Hello, how are you?'
# Your code here

Need a hint?

Call the llm like a function with the prompt string to get the response.