{"entities":[{"id":"anthropic","name":"Anthropic"},{"id":"claude-sonnet-4-5-system-card","name":"System Card: Claude Sonnet 4.5","subtype":"Technical report","description":"As dated September 2025 on its cover. The cover states 'September 2025'; no day of the month is given, so the date keeps month precision.","sourceIds":["source-ab-claude-sonnet45-card"]},{"id":"bio-misuse-capability-evaluation","name":"Biological misuse capability evaluation"}],"claims":[{"id":"ab-ev-claude-sonnet45-asl3-determination","statement":"The Claude Sonnet 4.5 system card states that the model demonstrated enhanced performance on several biological risk evaluations while remaining below ASL-4 rule-out thresholds, and that Anthropic has not determined whether it passed the ASL-3 capabilities threshold but cannot clearly rule out ASL-3 risks, so deploys it with ASL-3 measures as a precautionary, provisional action.","derivation":"explicit","resolution":"supported","editorialState":"seed","evidenceIds":["evidence-ab-ev-claude-sonnet45-asl3-determination-1","evidence-ab-ev-claude-sonnet45-asl3-determination-2","evidence-ab-ev-claude-sonnet45-asl3-determination-3"],"attributes":{"evaluatedSystem":"Claude Sonnet 4.5, compared in the card with Claude Sonnet 4, Claude Opus 4 and Claude Opus 4.1","evaluation":{"what":"Whether the model reaches the ASL-3 or ASL-4 capability thresholds, CBRN among the domains, with biological risks the primary focus","how":"Comprehensive automated evaluations across the ASL-3 and ASL-4 thresholds, with comparative assessment against the developer's earlier models","result":"In the card's own words at the cited locator, the model remained well below ASL-4 thresholds across all domains of concern, and demonstrated enhanced performance on several biological risk evaluations while remaining below ASL-4 rule-out thresholds; deployment under ASL-3 protections","caveats":"The card states that it has not determined whether the model definitively passed the ASL-3 capabilities threshold, only that ASL-3 risks cannot clearly be ruled out, and that the ASL-3 measures are precautionary and provisional."}}},{"id":"ab-ev-claude-sonnet45-bio-categories","statement":"The Claude Sonnet 4.5 system card states that its CBRN evaluations primarily focus on biological risks with the largest consequences and sets out separate ASL-3 and ASL-4 threat models for that domain.","derivation":"explicit","resolution":"supported","editorialState":"seed","evidenceIds":["evidence-ab-ev-claude-sonnet45-bio-categories-1","evidence-ab-ev-claude-sonnet45-bio-categories-2"]},{"id":"ab-ev-claude-sonnet45-published","statement":"Anthropic published the Claude Sonnet 4.5 system card, dated September 2025 on its cover.","derivation":"explicit","resolution":"supported","editorialState":"seed","evidenceIds":["evidence-ab-ev-claude-sonnet45-published-1"]}],"sources":[{"id":"source-ab-claude-sonnet45-card","title":"System Card: Claude Sonnet 4.5","authors":["Anthropic"],"publisher":"Anthropic","publicationDate":null,"version":"Retrieved for the candidate pack on 2026-10-28 (SHA-256 d5d1ce28fea101ae3b201a5d4da100090a5d6b73246f7da820cafd7dbb11100e). PDF whose cover reads 'System Card: Claude Sonnet 4.5, September 2025', as served on 2026-10-28; the request redirected to https://www-cdn.anthropic.com/963373e433e489a87a10c823c52a0a013e9172dd.pdf. No day of the month is stated. Retrieved again at admission on 2026-10-30 (SHA-256 d5d1ce28fea101ae3b201a5d4da100090a5d6b73246f7da820cafd7dbb11100e, the same bytes).","evidenceUrl":"https://assets.anthropic.com/m/12f214efcc2f457a/original/Claude-Sonnet-4-5-System-Card.pdf","language":"en"}],"evidence":[{"id":"evidence-ab-ev-claude-sonnet45-asl3-determination-1","sourceRole":"primary","support":"supports","verification":"machine_checked","retrievalRoute":"direct"},{"id":"evidence-ab-ev-claude-sonnet45-asl3-determination-2","support":"supports","verification":"machine_checked","retrievalRoute":"direct"},{"id":"evidence-ab-ev-claude-sonnet45-asl3-determination-3","support":"context","verification":"machine_checked","retrievalRoute":"direct"},{"id":"evidence-ab-ev-claude-sonnet45-bio-categories-1","sourceRole":"primary","support":"supports","verification":"machine_checked","retrievalRoute":"direct"},{"id":"evidence-ab-ev-claude-sonnet45-bio-categories-2","support":"supports","verification":"machine_checked","retrievalRoute":"direct"},{"id":"evidence-ab-ev-claude-sonnet45-published-1","sourceRole":"primary","support":"supports","verification":"machine_checked","retrievalRoute":"direct"}],"at":{"entities":[1,1237,1266],"claims":[3398,3399,3400],"sources":[1082],"evidence":[4673,4674,4675,4676,4677,4678]},"version":"1lg47t7"}