The document discloses that Claude Sonnet 4.5 was evaluated for its potential to provide meaningful assistance in creating weapons capable of mass casualties or attacking critical infrastructure, and that these evaluations informed the model's hardcoded refusal behaviors.
This analysis describes what Anthropic's agreement states, permits, or reserves. It does not constitute a legal determination about enforceability. Regulatory applicability and practical outcomes may vary by jurisdiction, enforcement context, and individual circumstances. Read our methodology
This provision provides documented evidence that Anthropic conducted structured pre-deployment safety evaluations for catastrophic risk scenarios, which is operationally relevant to enterprise customers, government users, and regulators assessing the model's safety posture for sensitive deployments.
The document states that Claude Sonnet 4.5 has been evaluated and configured to refuse meaningful assistance with CBRN weapon development and critical infrastructure attacks, providing operators and users with a disclosed basis for relying on these refusals in sensitive deployment contexts.
Cross-platform context
See how other platforms handle CBRN and Cyberweapon Uplift Evaluation Disclosure and similar clauses.
Compare across platforms →"We evaluate whether Claude can be used to provide serious uplift to those seeking to create biological, chemical, nuclear, or radiological weapons with the potential for mass casualties, and whether Claude can be used to assist in attacks on critical infrastructure.Excerpt from Anthropic's Claude Sonnet 5 System Card
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This provision provides documented evidence that Anthropic conducted structured pre-deployment safety evaluations for catastrophic risk scenarios, which is operationally relevant to enterprise customers, government users, and regulators assessing the model's safety posture for sensitive deployments.
The document states that Claude Sonnet 4.5 has been evaluated and configured to refuse meaningful assistance with CBRN weapon development and critical infrastructure attacks, providing operators and users with a disclosed basis for relying on these refusals in sensitive deployment contexts.
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