Roblox this week revealed more information about Sentinel, its AI solution designed to detect potentially dangerous chat messages. Specifically, it’s designed to detect potential grooming or child endangerment by spotting patterns in chat messages. As of this week, Roblox is making Sentinel open-source so that other platforms can use it.
According to Roblox’s announcement, Sentinel will put seemingly innocent chat messages into a larger context to spot possible harmful patterns: “We have developed Roblox Sentinel, an AI system built on contrastive learning that helps us detect early signals of potential child endangerment, such as grooming, allowing us to investigate even sooner and, when relevant, report to law enforcement.”
According to the company, Sentinel has caught 1,200 instances of potential child endangerment in the first half of 2025, leading to reports to the National Center for Missing and Exploited Children. In its announcement, Naren Koneru, Roblox’s VP of engineering and safety and Eleonore Vonck said they hope that making Sentinel open-source will “contribute to the collective advancement of online safety practices and the online communities that rely on them.”
The necessity of protecting children on Roblox is more urgent than ever, as multiple stories of predators harming the platform’s youngest members have come to light. Earlier this week, a family in California sued Roblox after one such criminal allegedly groomed and kidnapped a ten-year-old child via the game platform and Discord. Anapol Weiss, the law firm that brought the suit on behalf of the family, has filed six other similar lawsuits.