AI Rules for California Law Firms
Last verified July 8, 2026
California moved faster than most states on AI accountability, and your malpractice carrier, opposing counsel, and local courts have all noticed. If you're a managing partner fielding questions about your firm's AI use, from clients, from insurers, or from the bench, the rules below are where those questions originate.
Where California Stands
California now has a statute, a statewide court rule, and standing ethics guidance all addressing AI, with a rule change still pending. AB 316, effective January 1, 2026, removes "the AI did it" as a defense in harm claims tied to AI development, modification, or use. California Rules of Court, rule 10.430, required every court in the state to adopt a generative AI use policy, or ban it outright, by December 15, 2025. Layered on top is the State Bar's Practical Guidance for the Use of Generative Artificial Intelligence in the Practice of Law, adopted November 16, 2023.
What Your Firm Must Do
Because AB 316 removes autonomy as a defense, any AI tool your firm uses in client matters needs a human checking its output, since the firm carries the liability regardless of what the AI produced. Your firm also needs to know the generative AI policy of every California court where you appear, since rule 10.430 leaves confidentiality handling, disclosure labels, and permitted uses to each court individually rather than setting one statewide standard. The State Bar's Practical Guidance is the working reference for how confidentiality, competence, supervision, candor, and fee obligations apply to that AI use today.
What's Still Pending
The State Bar's Board approved an update to the Practical Guidance on May 14, 2026, adding expectations specific to agentic AI, worth watching for firms using more autonomous tools. Separately, proposed amendments to the Rules of Professional Conduct (Rules 1.1, 1.4, 1.6, 3.3, 5.1, and 5.3) would make independent verification of AI output, client notice when AI materially affects representation, verified citations, and firm-level AI governance policies enforceable rule requirements rather than guidance. Public comment on those amendments closed May 4, 2026, and firms that build these practices now won't be caught flat-footed if the rules are adopted. A separate bill, SB 574 (Umberg), would require attorneys who use generative AI in a filing to personally verify its accuracy; it passed the Senate 39-0 on January 29, 2026, cleared the Assembly Judiciary Committee 12-0 and the Assembly Privacy and Consumer Protection Committee 15-0, and remained pending on the Assembly floor as of its last amendment on July 2, 2026, ahead of the legislature's August 31, 2026 deadline for each house to pass bills.
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- AB 316 (2025), Artificial intelligence: defenses
- California Rules of Court, rule 10.430
- State Bar of California Practical Guidance for the Use of Generative Artificial Intelligence in the Practice of Law
- Proposed Amendments to the Rules of Professional Conduct Related to Artificial Intelligence
- SB 574 (Umberg), attorney generative AI verification bill, Bill History and Votes