OpenAI has released two new open-weight reasoning models, gpt-oss-120B and gpt-oss-20B, marking a return to more open-source AI development after several years. These models are optimized to run efficiently on laptops and local devices, with gpt-oss-120B being OpenAI's largest open-weight model to date and noted for its safety features. The release positions OpenAI competitively against Chinese AI firms like DeepSeek and challenges other industry players such as Meta and Google. Microsoft has integrated the smaller gpt-oss-20B model into Windows, with plans to extend availability to macOS through its local foundry initiatives. The models are available under the Apache 2.0 license, allowing customization without copyleft or patent restrictions. OpenAI's move is seen as a strategic bet to strengthen its market position ahead of the anticipated GPT-5 launch, which is expected to be a breakthrough. The new models have demonstrated strong benchmarking results, rivaling top open-source AI models globally, and are accessible via various platforms including OpenRouter, AWS, and Clarifai. This development enables developers and companies to deploy powerful AI locally with low latency and cost efficiency, expanding the toolkit for coding, scientific analysis, and mathematical reasoning. While some experts urge caution regarding risks, the release has been broadly welcomed as a significant shift in AI model accessibility and competition.