A California attorney must pay a $10,000 fine for filing a state court appeal full of fake quotations generated by the artificial intelligence tool ChatGPT.

The fine appears to be the largest issued over AI fabrications by a California court and came with a blistering opinion stating that 21 of 23 quotes from cases cited in the attorney’s opening brief were made up. It also noted that numerous out-of-state and federal courts have confronted attorneys for citing fake legal authority.

“We therefore publish this opinion as a warning,” it continued. “Simply stated, no brief, pleading, motion, or any other paper filed in any court should contain any citations — whether provided by generative AI or any other source — that the attorney responsible for submitting the pleading has not personall

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