California Legislature · 2025

California SB 53 — Transparency in Frontier AI Act

California's evolution from the vetoed SB 1047 to SB 53 illustrates the real-time negotiation between ambition and political feasibility in AI governance. SB 53 targets large frontier developers with over $500M annual revenue and requires transparency reports on safety testing, with critical safety incident reporting within 15 days standard or 24 hours if imminent harm.

Key Provisions

• Targets large frontier developers with >$500M annual revenue above certain computational thresholds
• Requires transparency reports on safety testing and precautions
• Critical safety incident reporting: 15 days standard, 24 hours if imminent harm
• No kill switch requirement or rigid pre-deployment testing regime
• Transparency-first rather than compliance-first approach
• Beginning to incorporate CAISI-aligned standards

Regulatory Philosophy

Iterative, transparency-driven, with voluntary alignment toward federal standards. California's shift from SB 1047's mandate-heavy approach to SB 53's transparency-first model reflects the political difficulty of imposing pre-deployment requirements on frontier developers headquartered in the state. Disclosure over prohibition is the guiding principle.

Position on Analytical Frameworks