a) the human would (deservedly[1]) be arrested for manslaughter, possibly murder
b) OpenAI would be deeply (and deservedly) vulnerable to civil liability
c) state and federal regulators would be on the warpath against OpenAI
Obviously we can't arrest ChatGPT. But nothing about ChatGPT being the culprit changes 2) and 3) - in fact it makes 3) far more urgent.
[1] It is a somewhat ugly constitutional question whether this speech would be protected if it was between two adults, assuming the other adult was not acting as a caregiver. There was an ugly case in Massachusetts involving where a 17-year-old ordered her 18-year-old boyfriend to kill himself and he did so; she was convicted of involuntary manslaughter, and any civil-liberties minded person understands the difficult issues this case raises. These issues are moot if the speech is between an adult and a child, there is a much higher bar.
IMO I think AI companies do have the ability out of all of them to actually strike the balance right because you can actually make separate models to evaluate 'suicide encouragement' and other obvious red flags and start pushing in refusals or prompt injection. In communication mediums like discord and such, it's a much harder moderation problem.