{"slug":"us-california-sb-53","title":"California SB 53: Transparency in Frontier Artificial Intelligence Act","short_title":"California SB 53","jurisdiction":"us-california","instrument_type":"act","status":"in_force","is_binding":true,"issuing_body":"California State Legislature","summary_plain":"SB 53 requires \"large frontier developers\" (developers of the most compute-intensive models above statutory thresholds) to publish a frontier AI framework describing how they assess and mitigate catastrophic risks, publish transparency reports when deploying new frontier models, report critical safety incidents to the California Office of Emergency Services, and protect employees who report safety concerns. It also directs creation of a public computing cluster (\"CalCompute\").\n","adopted_on":"2025-09-29","in_force_on":"2026-01-01","applies_from":"2026-01-01","official_source_url":"https://leginfo.legislature.ca.gov/faces/billNavClient.xhtml?bill_id=202520260SB53","last_verified_at":null,"review_status":"pending_review","confidence_level":"medium","updated_at":"2026-09-11T14:53:09+00:00","url":"https://aipolicytracker.org/policies/us-california-sb-53","status_note":"Signed 29 September 2025; operative 1 January 2026 for most provisions. A reviewer must confirm the operative dates and any federal pre-emption challenge.\n","scope_summary":"Applies to developers of frontier models meeting compute-based thresholds, with heightened duties for large frontier developers above a revenue threshold. Most obligations are transparency and reporting duties rather than prescriptive technical requirements.\n","who_it_applies_to":"Frontier-model developers operating in California, including companies based elsewhere that train frontier models and do business in the state.","key_dates_summary":"Signed 29 September 2025; operative 1 January 2026 (to be confirmed).","penalties_summary":"Civil penalties enforced by the Attorney General for non-compliance, with amounts set in the statute (reviewer to confirm figures).","what_organizations_must_do":"Large frontier developers should publish a frontier AI framework and model transparency reports, set up critical safety incident reporting, and implement whistleblower protections and internal reporting channels.\n","published_on":"2025-09-29","date_notes":null,"taxonomy":{"actor":["provider","gpai_provider"],"ai_system_type":["general_purpose_ai_model","generative_ai"],"sector":["cross_sector"],"risk_category":["systemic_risk"],"use_case":["generative_ai"]},"sections":[],"obligations":[{"slug":"us-california-sb-53-frontier-ai-framework","title":"Large frontier developers must publish a frontier AI framework","category":"safety_testing","summary":"Large frontier developers must publish and maintain a framework describing how they incorporate national and international standards, assess catastrophic risk, apply mitigations, secure model weights, and govern internal processes, and must review it at least annually.\n","practical_action":"Publish a safety framework and keep a change log of revisions.","is_binding":true,"applies_from":"2026-01-01","section":null,"source_reference":"Business and Professions Code, Chapter 25.1 (as added by SB 53)","official_source_url":"https://leginfo.legislature.ca.gov/faces/billNavClient.xhtml?bill_id=202520260SB53","review_status":"pending_review","confidence_level":"medium","last_verified_at":null,"actors":["gpai_provider"],"sectors":["cross_sector"],"use_cases":["generative_ai"],"applicability":[{"description":"Large frontier developers above the statutory compute and revenue thresholds.","actors":["gpai_provider"],"conditions":null}],"evidence_examples":[{"title":"Published frontier AI framework","description":null,"artifact_type":"document"}],"framework_mappings":[{"framework":"nist_ai_rmf","framework_name":"NIST AI RMF 1.0","reference":"GOVERN 1.x; NIST AI 600-1","note":"Original editorial mapping.","confidence_level":"medium","is_original":true}],"url":"https://aipolicytracker.org/obligations/us-california-sb-53-frontier-ai-framework"},{"slug":"us-california-sb-53-critical-safety-incident-reporting","title":"Report critical safety incidents to the Office of Emergency Services","category":"incident_handling","summary":"Frontier developers must report critical safety incidents to the California Office of Emergency Services within the statutory time limit after discovery, and the Office is to establish a reporting mechanism.\n","practical_action":"Define critical-safety-incident criteria and an escalation path with the statutory clock.","is_binding":true,"applies_from":"2026-01-01","section":null,"source_reference":"Business and Professions Code, Chapter 25.1 (as added by SB 53)","official_source_url":"https://leginfo.legislature.ca.gov/faces/billNavClient.xhtml?bill_id=202520260SB53","review_status":"pending_review","confidence_level":"medium","last_verified_at":null,"actors":["provider","gpai_provider"],"sectors":["cross_sector"],"use_cases":["generative_ai"],"applicability":[{"description":"Frontier developers.","actors":["gpai_provider","provider"],"conditions":null}],"evidence_examples":[{"title":"Incident classification and reporting procedure","description":null,"artifact_type":"document"}],"framework_mappings":[{"framework":"nist_ai_rmf","framework_name":"NIST AI RMF 1.0","reference":"MANAGE 4.3","note":"Incident response.","confidence_level":"medium","is_original":true}],"url":"https://aipolicytracker.org/obligations/us-california-sb-53-critical-safety-incident-reporting"}],"applicability_rules":[],"deadlines":[{"title":"Operative date","due_on":"2026-01-01","date_precision":"exact","date_label":null,"display_date":"1 January 2026","description":"Most provisions operative; confirm on the official bill page.","source_reference":null,"official_source_url":null,"status":"passed","confidence_level":"medium"}],"versions":[],"enforcement_events":[],"procurement_rules":[],"sources":[{"title":"SB 53 Transparency in Frontier Artificial Intelligence Act (bill text and history)","publisher":"California Legislative Information","url":"https://leginfo.legislature.ca.gov/faces/billNavClient.xhtml?bill_id=202520260SB53","document_date":"2025-09-29","document_type":"legislation","tier":1,"tier_label":"Official primary source (government, legislature, regulator, court, standards body, intergovernmental)"}],"related_policies":["eu-ai-act","us-nist-ai-rmf"],"related_frameworks":[],"faq":[],"source":{"official_source_url":"https://leginfo.legislature.ca.gov/faces/billNavClient.xhtml?bill_id=202520260SB53","source_title":"SB 53 Transparency in Frontier Artificial Intelligence Act","source_publisher":"California Legislative Information","source_document_date":"2025-09-29","source_reference":"Chapter 853, Statutes of 2025 (reviewer to confirm chapter number)","source_tier":1,"last_checked_at":null,"last_verified_at":null,"review_status":"pending_review","confidence_level":"medium","content_version":1,"change_summary":"Initial structured record; penalty amounts and chapter number to be confirmed.","reviewed_by":null}}