having waited for so long OpenAI A brand-new open-source model was finally officially announced earlier, called “gpt-oss.” It comes in two versions: gpt-oss-120b and gpt-oss-20b, and is now available for download on Hugging Face. For users whose computer hardware isn’t powerful enough, OpenAI also offers an online demo, letting you try it right in your browser.
OpenAI has officially launched two new open-source AI models, gpt-oss 120b and 20b.
Earlier, OpenAI officially announced the release of the gpt-oss open-source model, marking its first new open-source model since GPT-2 in 2019.
Want to see our open models in action?
Watch how gpt-oss builds a video game—using tools step-by-step within chain-of-thought reasoning 👾🍓 pic.twitter.com/WNeV0cpwM2
— OpenAI (@OpenAI) August 5, 2025
According to the description, gpt-oss is designed for powerful reasoning capabilities, agentic tasks, and diverse developer application scenarios. It is licensed under Apache 2.0. Users can adjust the reasoning intensity (low, medium, high) based on their task needs, and it also displays the full reasoning process. It supports fine-tuning and native MXFP4 quantization.
Regarding the agent aspect, the GPT-OSS model natively supports function calling, web browsing, Python code execution, and structured outputs.
gpt-oss-120b is a model with 117 billion parameters, of which 5.1 billion are active. OpenAI says it can run on a single H100 GPU, making it suitable for production environments, general-purpose use, and high-inference-demand scenarios.
The 21-billion-parameter gpt-oss-20b, with 360 million active parameters, is designed specifically for general computers, suitable for lower-latency scenarios, local deployment, or specialized use cases. It can run on devices with just 16GB of memory.
The chart below is test data shared by OpenAI. It shows that gpt-oss-120b scored 90 on the MMLU comprehensive general knowledge test, nearly catching up to OpenAI o3 and o4-mini, and even surpassed o3 on GPQA Diamond (high-difficulty Q&A), coming close to o4-mini. Even the smaller gpt-oss-20b traded blows with o3 and o4-mini overall, and took first place in the AIME 2025 math competition with a score of 98.7:
Currently, gpt-oss-120b and gpt-oss-12b are both available for download on Hugging Face, and can also be installed via Ollama and LM Studio. For users whose computer specs aren’t sufficient, OpenAI also offers an online version for everyone to try for free, so there’s no need to worry about not being able to run it.
After entering the gpt-oss Playground via the link above, you can choose on the left whether you want to use 120b or 12b, and both support Chinese conversation. Below that is the reasoning intensity, with low, medium, and high options. If you don’t want to see the reasoning content, you can turn off Show reasoning. It looks like this is completely free and unlimited here.
Source: KOCPC Chinese