{"schema_version":"0.10.0","id":"LR-2026-0751","record_version":1,"title":"Anthropic reports blocking scientists' attempts to use Claude in ways that could support biological weapons development","verification":{"human_verified":false,"method":"automated_gate","auto_verified":true,"score":58.2,"score_breakdown":{"source_authority":12.1,"independent_corroboration":15.0,"implicated_party_confirmed":0.0,"citation_integrity":14.0,"specificity":6.0,"completeness":3.2,"unhedged_language":5.0},"checks":{"schema_valid":true,"every_field_cited":true,"quotes_verbatim":true,"source_fetched":true,"distinct_incident":true,"dates_plausible":true,"sources_agree":true,"source_describes_incident":true,"severe_backed_by_source":true,"record_integrity":true,"eligible":true,"about_this_case":true},"gate_version":"gate-2026-10-18.7","cross_check_model":null,"cross_check_agreement":null,"duplicate_of":null,"verified_by":null,"verified_at":"2026-11-01","extraction_run_id":null,"evidence_level":{"level":"preliminary","reason":"1 report: CBS News · subject to change","original_document":null,"reports_total":2,"reports_independent":1,"reports_derivative":0,"developing":false,"disputed":false,"rules_version":"evidence-2026-10-29.1","computed_at":"2026-11-01","history":[{"date":"2026-11-01","from_level":null,"to_level":"preliminary","reason":"1 report: CBS News · subject to change"}]},"sources_hash":"95141cc6bf11ebe09b8d73367608cea4b8c90c3743756c07ad78452aadcd5e99"},"system":{"model_name":"Claude","model_version":null,"developer":"Anthropic","harness":null,"tools_granted":[],"permissions_scope":null,"autonomy_level":"unknown","guardrails_present":[],"deployment_context":"unknown","tier":null,"lifecycle_stage":null,"integration_type":null,"intended_use":null,"safeguard_state":null,"production_intended":null},"event":{"date_occurred":null,"date_disclosed":"2026-09-10","incident_class":"harmful_output","failure_class":null,"agent_involved":null,"secondary_failure_classes":[],"trigger":"unknown","duration":null,"detection_method":"unknown","summary":"Anthropic reported that scientists used its Claude AI models in ways that could support biological weapons development and that it blocked them. The cases were part of a threat report covering December 2025 to August 2026, and five involved activity with potential to support biological weapons. The people involved are working scientists, and the company said it cannot assert that they intended harm. When detected and investigated, the users' accounts were banned and findings were fed into safeguards, enforcement and threat intelligence. SFist reported that in one state-linked case the same actors re-established accounts and continued research within days. The company said the biological capability was shown but not that it would be used for real weapons. Other misuse in the report, such as influence operations and surveillance, is not part of this record.","tags":[],"date_detected":null,"near_miss":null,"root_cause":null,"root_cause_detail":null,"failure_class_detail":null,"responsible_party":null,"adversarial_actor":null,"input_provenance":null,"time_to_contain":null,"operations_paused":null,"remediation":"Banned the users' accounts and incorporated investigative findings into frontier model safeguards, enforcement and threat intelligence processes","precursor_events":null,"control_chain":[{"layer":"L1","party":"provider","party_name":null,"control_id":"D7","outcome":"held","reason":null,"quote":"When we detected and investigated these cases, we banned the users' accounts and incorporated our investigative findings into our frontier model safeguards, enforcement, and threat intelligence processes to better prevent, detect, and disrupt these activities in the future,\" the report said.","source_index":0,"reviewed":false}]},"impact":{"direct_loss_usd":null,"remediation_hours":null,"records_exposed":null,"third_parties_affected_count":null,"severity":"minor","severity_because":"Minor test: contained to the provider's own platform with accounts banned; the source states no third party was touched and no harm materialised.","harm_class":[],"affected_description":null,"protected_class_involved":null,"data_categories_exposed":[],"loss_range_usd":null,"reversibility":null,"downstream_exposure_count":null},"evidence":{"sources":[{"url":"https://www.cbsnews.com/news/anthropic-ai-claude-biological-weapons-development/","publisher":"CBS News","date":"2026-09-10","type":"press","title":"Anthropic says it disrupted scientists using Claude AI for possible biological weapons development - CBS News","archived_url":null,"attachment":"first_report","independence":"independent"},{"url":"https://sfist.com/2026/09/10/anthropic-says-it-shut-down-several-efforts-to-use-claude-to-develop-biological-weapons/","publisher":"SFist","date":"2026-09-10","type":"press","title":"Anthropic Says It Shut Down Several Efforts to Use Claude to Develop Biological Weapons - SFist","archived_url":null}],"per_field_confidence":{"system.model_name":"C","system.developer":"C","event.remediation":"C","event.incident_class":"D","impact.severity":"D","impact.severity_because":"D","event.control_chain":"C","event.summary":"C","system.autonomy_level":"D","system.deployment_context":"D","event.trigger":"D","event.detection_method":"D","context.country":"D","event.date_disclosed":"D","context.denominator_available":"D"},"field_citations":{"system.model_name":[{"source_index":0,"quote":"Anthropic said Thursday it blocked scientists who used its Claude AI models \"in ways that could support biological weapons development.\""}],"system.developer":[{"source_index":0,"quote":"Anthropic said Thursday it blocked scientists who used its Claude AI models \"in ways that could support biological weapons development.\""}],"event.remediation":[{"source_index":0,"quote":"When we detected and investigated these cases, we banned the users' accounts and incorporated our investigative findings into our frontier model safeguards, enforcement, and threat intelligence processes to better prevent, detect, and disrupt these activities in the future,\" the report said."}],"event.incident_class":[{"source_index":0,"quote":"Anthropic said Thursday it blocked scientists who used its Claude AI models \"in ways that could support biological weapons development.\""}],"impact.severity":[{"source_index":0,"quote":"The company said the cases identified \"provide evidence of capability\" of the AI models, but \"cannot concretely demonstrate that such capability would ever be used to develop biological weapons in the real world.\""}],"impact.severity_because":[{"source_index":0,"quote":"When we detected and investigated these cases, we banned the users' accounts and incorporated our investigative findings into our frontier model safeguards, enforcement, and threat intelligence processes to better prevent, detect, and disrupt these activities in the future,\" the report said."}],"event.control_chain":[{"source_index":0,"quote":"When we detected and investigated these cases, we banned the users' accounts and incorporated our investigative findings into our frontier model safeguards, enforcement, and threat intelligence processes to better prevent, detect, and disrupt these activities in the future,\" the report said."}],"event.summary":[{"source_index":0,"quote":"Anthropic said Thursday it blocked scientists who used its Claude AI models \"in ways that could support biological weapons development.\""},{"source_index":0,"quote":"Anthropic shared five cases involving activity that had the potential to support the development of biological weapons."},{"source_index":0,"quote":"The people involved in these cases are working scientists, whom Anthropic chose not to identify."},{"source_index":0,"quote":"When we detected and investigated these cases, we banned the users' accounts and incorporated our investigative findings into our frontier model safeguards, enforcement, and threat intelligence processes to better prevent, detect, and disrupt these activities in the future,\" the report said."},{"source_index":1,"quote":"Chillingly, after the first activity was intercepted, the same actors re-established new accounts and continued the research within days, trying to evade detection."}]},"notes_on_gaps":"The sources do not state whether an autonomous agent was involved, so agent_involved, failure_class and autonomy_level are omitted. No detection method, responsible party, trigger, root cause, adversarial actor, account or person counts, affected third parties, records, loss or single occurrence date are stated. The date_disclosed value 2026-09-10 comes from the source header and the Thursday reference; the source text gives no calendar date. Severity minor and incident_class harmful_output are my judgements. Control D2 'held' is inferred from the word 'blocked' and is not described as a named control. The Claude Fable 5 safeguards remediation concerns a different, newer model and is not confirmed as a fix for these cases. Source 1 describes the chikungunya case and the second timeline entry; its details are press characterisation of the report. Other misuse in the report (influence operations, surveillance) is excluded because it is not part of this bio-misuse incident. [case created by the backfill: read by claude-haiku-5-5, backfill-2026-11-01.2, 2026-11-01; not yet reviewed] [2026-11-01: evidence level set: Preliminary (1 report: CBS News · subject to change)]"},"context":{"industry":null,"org_size_band":null,"country":"unknown","denominator_available":false,"denominator":null,"related_incident_ids":[],"systemic_exposure":null,"shared_model_id":null,"upstream_incident_id":null,"incident_evidence":null,"regulatory":null,"coverage":null},"narrative":{"steps":[{"step":"doing","text":"Scientists used Claude AI models in ways that could support biological weapons development, according to Anthropic.","quote":"Anthropic said Thursday it blocked scientists who used its Claude AI models \"in ways that could support biological weapons development.\"","source_index":0,"grade":"C"},{"step":"went_wrong","text":"Anthropic identified five cases of activity with potential to support biological weapons development.","quote":"Anthropic shared five cases involving activity that had the potential to support the development of biological weapons.","source_index":0,"grade":"C"},{"step":"caught","text":"Anthropic detected and investigated the cases and banned the users' accounts.","quote":"When we detected and investigated these cases, we banned the users' accounts and incorporated our investigative findings into our frontier model safeguards, enforcement, and threat intelligence processes to better prevent, detect, and disrupt these activities in the future,\" the report said.","source_index":0,"grade":"C"},{"step":"done","text":"Anthropic fed its investigative findings into safeguards, enforcement and threat intelligence processes.","quote":"When we detected and investigated these cases, we banned the users' accounts and incorporated our investigative findings into our frontier model safeguards, enforcement, and threat intelligence processes to better prevent, detect, and disrupt these activities in the future,\" the report said.","source_index":0,"grade":"C"}],"model":"claude-haiku-5-5","prompt_version":"backfill-2026-11-01.2","extracted_at":"2026-11-01","source_urls":["https://www.cbsnews.com/news/anthropic-ai-claude-biological-weapons-development/","https://sfist.com/2026/09/10/anthropic-says-it-shut-down-several-efforts-to-use-claude-to-develop-biological-weapons/"]},"analysis":{"sections":{"timeline":[{"text":"The cases occurred in this period.","quote":"The cases, occurring between December 2025 and August 2026, are examples of \"the most notable and novel threat activity\" identified by Anthropic so far, the company said.","source_index":0,"when":"December 2025 to August 2026"},{"text":"After one activity was intercepted, the same actors re-established accounts and continued the research within days.","quote":"Chillingly, after the first activity was intercepted, the same actors re-established new accounts and continued the research within days, trying to evade detection.","source_index":1,"when":null},{"text":"Anthropic detected and investigated the cases, banned the users' accounts and updated its safeguards and enforcement processes.","quote":"When we detected and investigated these cases, we banned the users' accounts and incorporated our investigative findings into our frontier model safeguards, enforcement, and threat intelligence processes to better prevent, detect, and disrupt these activities in the future,\" the report said.","source_index":0,"when":null}]},"model":"claude-haiku-5-5","prompt_version":"backfill-2026-11-01.2","extracted_at":"2026-11-01","source_urls":["https://www.cbsnews.com/news/anthropic-ai-claude-biological-weapons-development/","https://sfist.com/2026/09/10/anthropic-says-it-shut-down-several-efforts-to-use-claude-to-develop-biological-weapons/"]}}