OpenAI said it considered contacting Canadian police in June last year after flagging a user account for possible violent activity.
The account was later linked to Jesse Van Rootselaar, who carried out a deadly attack in British Columbia.
The company’s safety systems identified the account for “furtherance of violent activities”.
It reviewed whether to notify the Royal Canadian Mounted Police.
At the time, it decided the activity did not show an imminent and credible threat.
Last week, the 18-year-old killed eight people before dying from a self-inflicted gunshot wound.
Police said the victims included a teaching assistant and several students aged 12 to 13.
The attack is the deadliest in Canada since the 2020 Nova Scotia shootings.
After learning of the tragedy, OpenAI contacted the RCMP and shared relevant information.
The company said it will continue to assist the investigation.
Authorities reported the suspect had prior mental health-related contact with police.
The motive for the attack remains unclear.
