Tertium is a non-profit bringing together a coalition to share the cost of training frontier models, open by default and built to stay under meaningful human oversight.
Our Mission
AI is set to be the most consequential technology humanity has ever developed. Our purpose is to put sovereign access to it within reach of as many countries and their peoples as possible, giving them the agency to shape their own future. Members contribute to the cost of building, but no one has a monopoly on the shared capability; our aim is to narrow the gap between nations.
Open code; open data, subject to privacy and copyright; and open weights wherever responsible. We release every model as widely as we can demonstrate to be safe, and where we can’t release weights openly, we share them with our partners on equal terms.
Tertium is a non-profit. Members carry a fair share of the cost of training, in capital or in kind through data, compute or expertise. The terms are the same for every partner, access is never used as a lever, and paying in more than your share buys no advantage.
Tertium builds and distributes the models; providing inference is left to those who hold the weights. Partners run them downstream on their own infrastructure, from large clusters to small on-premise nodes, on terms that are theirs to set.
Before any model is considered for release, independent external evaluators such as the UK AI Safety Institute, METR and Apollo Research deliver a safety report to our Safety Board. Tertium owns the release decision, and publishes the reasoning behind every one.
Narrow data builds narrow models. We train on the breadth of human knowledge: the world’s languages, cultures and ways of thinking, so that the future they shape is inclusive.
How We Operate
A commitment is only worth as much as it is verifiable and costly to break. We govern Tertium by a plan published in advance, so that we can be held accountable to our own guidelines.
How Tertium is structured, how partner access works, and how we decide whether a model goes out open-weight or shared-weight.
Read the overview→The entrenched principles that bind Tertium, and the operating principles that guide how we build and release frontier models.
Read the principles→
