A frontier lab works near the current leading edge of model capability, often using large research teams, substantial computing resources, and private evaluation systems. Its work may cover model training, deployment, safety research, and the infrastructure needed to operate powerful systems.
The label describes a lab's position relative to current capabilities, not a permanent status or a guarantee of responsible behavior. Independent evidence is still needed to assess a lab's models, controls, disclosures, and response to discovered risks.
ELI5
A frontier lab is an organization working on some of the most capable general AI models available at a particular time. The word frontier moves as technology improves, so it is a description of current position rather than a permanent title.
For example, a frontier lab may spend heavily on training, model serving, safety testing, and developer tools. It may also limit how competitors use its model outputs, especially when those outputs could help train another model.

