License to train
Authorization before frontier training. Get a regulator's approval before you start a training run above the threshold.
What it does
Before starting a very large training run, the lab submits a safety plan to a regulator and waits for approval. The regulator can say no.
Applies to: Training runs above a compute threshold (10^26 FLOP or a successor).
- Before beginning a training run above the threshold, submit a safety and security plan for the run and receive authorization.
- The regulator may impose conditions or withhold approval.
- Distinct from SB 1047, which required a self-certified protocol before training but no approval.
Where things stand
No U.S. law does this. SB 1047 required a written protocol and cybersecurity before training, self-certified. The EU AI Act requires notification, not approval. A true licensing gate on training has been proposed by think tanks and in early drafts of federal bills but not enacted.
Why it costs ~2.5 months
This comes before the model exists, so waiting for approval delays the next training run. The model estimates about four weeks of lost U.S. progress a year after the law takes effect.
Biggest unknown: Whether the regulator can say no, and how long it takes to say yes.
Why it lowers p(doom) by ~0.4%
Stops a lab from building a much more powerful model until it can show it can keep it under control.
This acts before a dangerous model exists, when prevention is easiest. It's among the stronger measures, though regulators may struggle to judge the cases.
The strongest case that it costs more
Licensing regimes in other industries take far longer than 30 days once they mature, and a regulator that can say no will eventually say no. The first refusal costs a generation, not a month. A lab also cannot plan a run it does not know will be approved, so the parallel-filing assumption breaks down as the regime tightens. Three months could be the floor rather than the ceiling.
The debate
For
- Sens. Blumenthal and Hawley proposed a licensing regime run by an independent oversight body, 2023.
- Sam Altman, OpenAI told the Senate the U.S. should consider licensing for models above a capability threshold, 2023.
- Brad Smith, Microsoft called for licensing so an agency is informed of testing before deployment, 2023.
Against
Sources
Rough starting points, not precise forecasts. Lead costs assume China doesn't depend on U.S. models, the case least favorable to safety laws, and count 3 years. On the menu you can change every assumption and put in your own numbers. Last priced 2026-09-26.