California governor Gavin Newsom on Monday signed into law a first-of-its-kind law regulating artificial intelligence chatbots, defying a push from the White House to leave such technology unchecked.

"We've seen some truly horrific and tragic examples of young people harmed by unregulated tech, and we won't stand by while companies continue without necessary limits and accountability," Newson said after signing the bill into law.

The landmark law requires chatbot operators to implement "critical" safeguards regarding interactions with AI chatbots and provides an avenue for people to file lawsuits if failures to do so lead to tragedies, according to state senator Steve Padilla, a Democrat who sponsored the bill.

The law comes after revelations of suicides involving teens who used chatbots prior to taking their lives.

"The Tech Industry is incentivised to capture young people's attention and hold it at the expense of their real world relationships," Padilla said prior to the bill being voted on in the state senate.

Padilla referred to recent teen suicides including that of the 14-year-old son of Florida mother Megan Garcia.

Megan Garcia's son, Sewell, had fallen in love with a "Game of Thrones"-inspired chatbot on Character.AI, a platform that allows users – many of them young people – to interact with beloved characters as friends or lovers.

When Sewell struggled with suicidal thoughts, the chatbot urged him to "come home."

Seconds later, Sewell shot himself with his father's handgun, according to the lawsuit Garcia filed against Character.AI.

"Today, California has ensured that a companion chatbot will not be able to speak to a child or vulnerable individual about suicide, nor will a chatbot be able to help a person to plan his or her own suicide," Garcia said of the new law.

The landmark chatbot safety measure was among a slew of bills signed into law on Monday by Newsom crafted to prevent AI platforms from doing harm to users.

New legislation included a ban on chatbots passing themselves off as health care professionals and making it clear that those who create or use AI tools are accountable for the consequences and can't dodge liability by claiming the technology acted autonomously, according to Newsom's office.

California also ramped up penalties for deepfake porn, allowing victims to seek as much at US$250,000 per infraction from those who aid in distribution of nonconsensual sexually explicit material. (AFP)