Welcome to the gpt-oss series, OpenAI’s open-weight models designed for powerful reasoning, agentic tasks, and versatile developer use cases.

OpenAI and open-source are now officially in the same sentence. It's happening. OpenAI is releasing open-weight reasoning models with state-of-the-art real-world performance, comparable to the O4 Mini, and — here's the kicker — they can run locally on your machine!

Open-Source AI from OpenAI

There are currently two models listed on Hugging Face:

117B parameters — massive, powerful
21B parameters — more lightweight, still impressive

These are downloadable and runnable locally by anyone.

This is game-changing. For years, OpenAI has led with proprietary models. Now, they're joining the open-source movement — a space Meta previously dominated with LLaMA. But now? The game is changing.

The Age of Personal AI Assistants

Mark Zuckerberg was right in one of his recent talks:

“The future of AI is personal assistants — for everyone.”

And to achieve that, you can't rely solely on centralized cloud services. You need models that run locally — on your mobile, on your desktop — tailored to your needs. That's exactly what open-source models enable.

The Application Era is Here

This moment marks a turning point — not just for AI, but for developers:

You don’t have to be a researcher to build intelligent apps.

You can integrate these open models into mobile apps, web apps, enterprise tools, learning platforms, and more.

Now is the best time to be a developer. The barriers are falling. The tools are available. The age of AI-powered applications has arrived.

Let’s build. 💥

O4 Mini

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OpenAI launches two ‘open’ source models

Ready to do your best work? Let's get you started.

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