OpenAI considered reporting a user to Canadian police months before the Tumbler Ridge school shooting.
The company said its systems flagged the account for “furtherance of violent activities” in June last year.
The user was later identified as Jesse Van Rootselaar, who killed eight people in British Columbia before taking their own life.
At the time of the alert, OpenAI decided the activity did not meet the threshold for law-enforcement referral.
The company said it found no evidence of an imminent or credible attack plan.
Its policy requires a clear and immediate risk of serious harm before contacting authorities.
After the shooting, OpenAI sent information about the account to the Royal Canadian Mounted Police and pledged to assist the investigation.
Police said the attacker first killed family members at home and then targeted a nearby school.
The victims included a teaching assistant and five students aged 12 to 13.
The motive remains unknown, and the suspect had prior mental-health-related contact with police.
The attack is the deadliest mass killing in Canada since the 2020 Nova Scotia rampage.
