I Built a Simple AI Text Summarizer in Python

I’ve been using Python a lot lately for small automation and AI experiments, and one of the simplest but surprisingly useful things I built was a text summarizer.

The idea is very basic: you give it a long piece of text, and it returns a shorter version that still keeps the main meaning.

Nothing fancy just Python + an AI API but it’s actually something you can turn into real tools pretty quickly.

I started with a simple thought: most of the time, I don’t need all the text, I just need the key idea. So I tried to automate that.

Here’s the core part of the code:

python id="h3k1a9"
from openai import OpenAI

client = OpenAI(api_key="YOUR_API_KEY")

def summarize_text(text):
    response = client.chat.completions.create(
        model="gpt-4o-mini",
        messages=[
            {
                "role": "system",
                "content": "Summarize the text in a clear and simple way."
            },
            {
                "role": "user",
                "content": text
            }
        ]
    )

    return response.choices[0].message.content

Honestly, this is pretty much it.
You pass in text, and the AI does the rest.

To test it, I just used a random paragraph:

python id="k9s2ld"
text = """
Python is widely used in AI, automation, and data science.
It is popular because it is simple and has a lot of powerful libraries.

print(summarize_text(text))

And the output is something like:

Python is a simple and popular language used in AI, automation, and data science.

What I like about this is how quickly something useful comes together.

It’s not a big system, but it already feels like a real tool. And from here, you can easily expand it into things like:

• PDF summarizers
• YouTube video summarizers
• note-taking assistants
• Slack or Discord bots

The more I work with Python + AI, the more I feel like the real skill is not writing complex code anymore it’s just connecting the right pieces together.

That’s it. Simple idea, simple code, but surprisingly useful.