Latest
  1. Johns Hopkins Bayview tells 3,182 patients an employee put their health data into a public AI tool
  2. China’s AI compute access expected to double in 2027, with US-designed chips about 65 per cent
  3. UK commits £100m to national AI Biosecurity Lab
  4. Moonshot AI releases Kimi K3.1 Pro with 1-million-token context window
  5. Residents in Newport and Cardiff oppose hyperscale datacentres near homes
  6. Study: Grok 4.7 picked Republicans in 92% of forced midterm answers, GPT-6.1 Sol picked Democrats in 97%
  7. Attackers exploiting the PHP flaws hand the break-in to AI agents, Unit 42 says
  8. Elvis Presley’s rightsholders sue Anthropic over training on 274 songs

Rules / California

Transparency in Frontier Artificial Intelligence Act (SB 53)

In forceLawBinding

Requires developers of frontier models (trained with more than 10^26 operations) to publish transparency reports at release, and ‘large frontier developers’ (over $500M annual revenue) to publish and follow a frontier AI framework on catastrophic risk and send quarterly risk summaries to Cal OES. Critical safety incidents must be reported to Cal OES within 15 days; incidents posing an imminent risk of death or serious injury must be disclosed within 24 hours to an appropriate law-enforcement or public-safety authority, and whistleblowers are protected.

Why it matters

The first binding US frontier-model safety law; it is the template copied by New York’s RAISE Act and Illinois SB 315 and a prime target of federal preemption efforts.

What it requires

Frontier model safetyTransparency to usersIncident reportingPenalties

Key obligations, provision by provision

9 obligations in article order. How IDs work

  1. WTA-R-US-CA-0004-008Labor Code Section 1107.1(a)-(b), (d)DevelopersSince 1 Jan 2026

    Do not adopt rules, policies or contracts that stop covered employees from reporting catastrophic-risk dangers or violations to authorities, or retaliate against them, and give covered employees clear notice of these rights.

  2. WTA-R-US-CA-0004-009Labor Code Section 1107.1(e)DevelopersSince 1 Jan 2026

    Provide a reasonable internal process for covered employees to disclose catastrophic-risk dangers or violations anonymously, with monthly status updates to the discloser and quarterly sharing with officers and directors.

  3. WTA-R-US-CA-0004-001Section 22757.12(a)-(b)DevelopersSince 1 Jan 2026

    Write, follow and publish a frontier AI framework covering catastrophic-risk thresholds, mitigations, third-party assessment, model-weight security, incident response and internal-use risk; review it yearly and publish material changes with justification within 30 days.

  4. WTA-R-US-CA-0004-002Section 22757.12(c)(1)DevelopersSince 1 Jan 2026

    Publish, before or when deploying a new or substantially modified frontier model, a transparency report with release date, languages, output modalities, intended uses, use restrictions and a contact mechanism.

  5. WTA-R-US-CA-0004-003Section 22757.12(c)(2)DevelopersSince 1 Jan 2026

    Include in the transparency report summaries of catastrophic-risk assessments under the frontier AI framework, their results, third-party evaluator involvement, and other framework steps taken for the model.

  6. WTA-R-US-CA-0004-004Section 22757.12(d)DevelopersSince 1 Jan 2026

    Send the Office of Emergency Services a summary of any assessment of catastrophic risk from internal use of frontier models every three months, or on another reasonable schedule communicated in writing.

  7. WTA-R-US-CA-0004-005Section 22757.12(e)DevelopersSince 1 Jan 2026

    Do not make materially false or misleading statements about catastrophic risk from frontier models or its management, or, for large frontier developers, about implementing or complying with the frontier AI framework.

  8. WTA-R-US-CA-0004-006Section 22757.13(c)(1)DevelopersSince 1 Jan 2026

    Report any critical safety incident involving a frontier model to the Office of Emergency Services within 15 days of discovering it.

  9. WTA-R-US-CA-0004-007Section 22757.13(c)(2)DevelopersSince 1 Jan 2026

    Disclose a critical safety incident that poses an imminent risk of death or serious physical injury within 24 hours to an appropriate authority, such as a law enforcement or public safety agency.

Penalties

Civil penalty up to $1,000,000 per violation, enforced by the California Attorney General

SourceOffice of the Governor of California: https://www.gov.ca.gov/2025/09/29/governor-newsom-signs-sb-53-advancing-californias-world-leading-artificial-intelligence-industry/Secondary: https://www.mofo.com/pdf/resources/insights/251001-california-enacts-ai-safety-transparency-regulation-tfaia-sb-53 Checked against the source on 4 Oct 2026. Also sets up a consortium to design the ‘CalCompute’ public compute cluster.

Cite this record

WTA-R-US-CA-0004: Transparency in Frontier Artificial Intelligence Act (SB 53). California Legislature / Governor. wheresthe.ai, https://wheresthe.ai/rule/us-ca-sb53-tfaia-2025/ (checked 4 Oct 2026).

History

  • Summary changed from …days (24 hours if there is imminent risk of death or serious injury),… to …days; incidents posing an imminent risk of death or serious injury must be disclosed within 24 hours to an appropriate law-enforcement or...…

More from California