Our Responsible Scaling Policy has been instrumental in addressing catastrophic safety failures and misuse of frontier models, providing a structured framework for organizations to prioritize safety and security. By establishing Red Line Capabilities and testing for them, we can identify potential risks and develop mitigations before they become catastrophic. The policy also emphasizes the importance of balancing commitments with uncertainty, acknowledging that industry actors face increasing commercial pressures while seeking established best practices and regulations. Our teams are actively exploring ways to incorporate practices from existing risk management and operational safety domains, including nuclear security, biosecurity, systems safety, autonomous vehicles, aerospace, and cybersecurity. We are committed to establishing a set of high-level commitments to ensure the responsible scaling of frontier models, including establishing Red Line Capabilities, testing for them, responding to them, iteratively extending the policy, and implementing assurance mechanisms. Our threat modeling and evaluations have revealed the need for further threat modeling, and we are focusing on building evaluations in various domains to monitor capabilities that may still be unsuitable for the ASL-3 standard. The ASL-3 standard aims to design and implement a set of controls that will sufficiently mitigate the risk of model weights being stolen by non-state actors or models being misused via our product surfaces. We are also exploring governance, coordination, and assurance structures to ensure the responsible scaling of frontier models, including creating a "second line of defense" and implementing regular updates to stakeholders.