SAN FRANCISCO — OpenAI has released a specialized artificial intelligence model designed to find and exploit software vulnerabilities, but it is limiting access to vetted security customers after rating the model's cyber capabilities at its highest risk level.

OpenAI released GPT-6 Cyber, a model built to find and exploit security flaws, to a small group of vetted customers on Thursday, rating it "Critical" in cybersecurity under its safety framework. That is up from "High" for its predecessor, GPT-5.6 Cyber.

GPT-6 Cyber is a version of OpenAI's GPT-6 Astra model trained for authorized vulnerability research.

OpenAI said the model is meant to help security researchers find vulnerabilities, test how they could........

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