Artificial intelligence has entered another consequential and dangerous phase. The debate is no longer simply about who can build the most powerful AI model. Increasingly, it is about who controls those models, who can obtain them, and what happens when increasingly powerful AI capabilities become freely available around the world.
At the centre of this debate is the concept of open-source and open-weight artificial intelligence. The distinction is important. In traditional open-source software, developers generally have access to the source code and the freedom to inspect, modify and redistribute it. The Open Source Initiative argues that genuinely open-source AI should similarly provide sufficient access to the components and information necessary to study, modify and reproduce the system.
Open-weight AI is narrower. Here, developers release the numerical parameters, or “weights”, that a trained neural network has learned. These weights can allow organisations and individuals to download, modify and operate sophisticated AI models on their own infrastructure.
OpenAI itself now offers open-weight models through its gpt-oss family under the permissive Apache 2.0 licence. These models can operate on infrastructure controlled by the user rather than through ChatGPT or OpenAI’s hosted API.
