OpenAI said it considered alerting Canadian authorities about a user later identified as school shooter Jesse Van Rootselaar.
The account was flagged in June for activity linked to the “furtherance of violent activities”.
The company reviewed whether to contact the Royal Canadian Mounted Police.
It decided the case did not meet the threshold for referral.
That threshold requires a credible and imminent risk of serious harm.
Months later, the 18-year-old killed eight people in Tumbler Ridge, British Columbia, before taking his own life.
Police said the victims included a teaching assistant and several students.
Investigators are still examining the motive.
After the attack, OpenAI proactively shared information with the RCMP.
The company said it will continue to support the investigation.
The shooting is Canada’s deadliest mass killing since the 2020 Nova Scotia rampage.
The case has renewed debate about when technology firms should alert law enforcement about threatening user activity.
