Conclusion
The current evidence base of the marginal risks and benefits of open-weight foundation models is not sufficient either to definitively conclude that restrictions on such open-weight models are warranted, or that restrictions will never be appropriate in the future. Accordingly, we recommend a three-part framework for the federal government to actively monitor the evidence base for the risks and benefits of dual-use foundation models with widely available model weights: collecting evidence about their capabilities, limitations, and information content, evaluating that evidence against thresholds of concern, and potentially acting upon those evaluations through appropriate policy measures. The government should also incentivize global and domestic research and innovation that harnesses the many benefits of open foundation models.