How to Run gpt-oss Locally in NativeMind (Setup Guide)

OpenAI recently released gpt-oss, a small open-weight language model, sparking excitement in the AI community. It’s lean, immediately approachable, and lightweight, better for writing, coding, secure offline chatting, etc.

NativeMind now supports gpt-oss as one of its integrated local AI models. In this article, you'll learn how to use gpt-oss in NativeMind (with setup steps included) and the frequently asked questions you may have.

What is gpt-oss

gpt-oss is an open-weight language model released by OpenAI in August 2025. It’s designed to be:

• Lightweight – runs on consumer hardware
• Open – permissively licensed

Model details of gpt-oss

According to OpenAI, you have two options of gpt-oss models currently: gpt-oss:20b and gpt-oss:120b. Here are some differences between them, and you can choose one according to your needs.

Benefits of Running gpt-oss Locally

gpt-oss is OpenAI’s first general-purpose language model released with open weights and an Apache 2.0 license, allowing full commercial use and local deployment.

Unlike o3-mini or o4-mini, which are closed and API-only, gpt-oss can be run entirely on your own device or infrastructure—giving you full control over cost, latency, and data privacy.

The larger variant, gpt-oss-120b, uses a Mixture-of-Experts architecture to deliver strong reasoning performance with optimized efficiency. According to OpenAI, its performance is comparable to o4-mini, making it one of the most powerful open-weight models available today.

And for gpt-oss-20b, it’s comparable to o3-mini, which means that you can have an “offline ChatGPT” if you run it via NativeMind!

How to Set up gpt-oss in NativeMind

NativeMind, your private, open-weight, on-device AI assistant, now supports gpt-oss and other local LLMs like Deepseek, Qwen, Llama, Gemma, Mistral, etc. It’s very easy to set gpt-oss by connecting to Ollama, read the simple guide below.

Step 1: Setup Ollama in NativeMind

1. Download and install NativeMind into your browser.
2. Follow the simple guide to set up Ollama in your device.

Tips: You can skip this step if you have already setup NativeMind correctly on your device.

Step 2: Download gpt-oss via Ollama

1. Move to Ollama and find the gpt-oss model.
2. Choose the size you want and click Use in NativeMind option to download.

Step 3: Run gpt-oss in NativeMind

1. Open NativeMind in your browser, and now you can find the gpt-oss model.
2. Select gpt-oss as your current model, and start using it smoothly.

FAQ about Using gpt-oss in NativeMind

1. Can I run gpt-oss without a GPU?

Yes. The smaller model gpt-oss:20b can run on a modern CPU with around 16GB RAM, though having a GPU will improve performance. The gpt-oss:120b variant generally requires a high-end GPU or server hardware.

2. Is gpt-oss free to use?

Yes. You can use gpt-oss totally free in NativeMind.

3. What can I use gpt-oss for?

You can use it for writing, summarizing, translating, coding, Q&A, and long-document analysis. With NativeMind, all of this can run fully offline, keeping your data private.

4. Which version should I choose: 20B or 120B?

• Choose 20B if you want fast, lightweight local AI on standard hardware.
• Choose 120B if you have the hardware and need maximum reasoning power for complex tasks.

Try It Now

After reading the setup guide above, you may have a general idea on gpt-oss and how to use it in NativeMind. Try it now to have a quick experience on using gpt-oss to summary web page content, translate multiple languages, chat on context, and even write blog posts, emails, or notes—without any data sending to cloud.

👉 Install NativeMind: https://github.com/NativeMindBrowser/NativeMindExtension

📁 Setup gpt-oss in Ollama: https://ollama.com/library/gpt-oss

💬 Start chatting locally with NativeMind today—no cloud, no API key, no limits. Just speed, privacy, and productivity in your browser.