Governor Newsom returned SB 1047 without his signature in 2024. SB 53, the Transparency in Frontier Artificial Intelligence Act, took effect January 1, 2026; its text names “Cybersecurity practices to secure unreleased model weights”.
On open weightsCybersecurity practices to secure unreleased model weights from unauthorized modification or transfer by internal or external parties.
The code says Chapter 25.1 was added by Stats. 2025, Ch. 138, Sec. 2 (SB 53), effective January 1, 2026. It defines a frontier model as a foundation model trained using more than 10^26 operations and defines 'model weight' as a numerical parameter adjusted through training.
Governor Gavin Newsom Veto: Governor Newsom returned Senate Bill 1047 unsigned, a bill on safeguards for developers of large artificial intelligence models and a Board of Frontier Models.
The letter is dated September 29, 2024, and begins 'I am returning Senate Bill 1047 without my signature.' It says the bill would require developers of large artificial intelligence models, and those providing computing power to train them, to put safeguards in place, and would establish a Board of Frontier Models.
Maple runs open-weight models inside a hardware-isolated enclave. Maple cannot see your chats. How it works
Every entry cites one primary source, quotes the document’s own words about open weights, and is checked against that source before it publishes. Corrections keep the old wording visible. Methodology · Corrections · Suggest an entry or a correction
