Artificial intelligence developer Anthropic became the first major tech company on Monday to endorse a California bill that would regulate the most advanced AI models.

Proposed by state Sen. Scott Wiener, if passed, S.B. 53 would create the first broad legal requirements for large developers of AI models in the United States.

Among other conditions, the bill would require large AI companies offering services in California to create, publicly share and adhere to safety-focused guidelines and procedures stipulating how each company attempts to mitigate risks from AI. The bill would also strengthen whistleblower requirements, by creating stronger pathways for employees to flag concerns about severe or potentially catastrophic risks that might otherwise go unreported.

“With SB 53, d

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