OpenAI on Thursday officially unveiled GPT‑6 Astra, which it described as the "world's most intelligent and aligned model." The development comes days after the artificial intelligence (AI) company said the model had reached the "Critical" cybersecurity capability threshold under its Preparedness Framework. "Astra is state-of-the-art on computer use, browsing, software engineering, cybersecurity, science, and professional work. Astra saturates FrontierMath Tier 4 with a 98% score," OpenAI said. "Astra also saturates ARC-AGI-3 with a 99.9% score and ExploitBench with a 100% score. It also sets a new frontier on computer and browser use, handling the most demanding professional work with unmatched speed, accuracy, and judgment." The model is currently rolling out to a small set of organizations and is expected to be available to all ChatGPT Plus, Pro, Business, and Enterprise users, as well as through the OpenAI API, Microsoft Azure, and Amazon Web Services (AWS) Bedrock. On ExploitBench, which evaluates a model's ability to turn known software vulnerabilities into working exploits, Astra achieved a perfect score of 100%, as opposed to 78.5% for GPT‑5.6 Sol, its previous frontier cyber-capable model. OpenAI said the model also achieves substantially higher arbitrary code-execution rates than GPT‑5.6 Sol when testing its exploit development capabilities using flaws from the previous three months between July and August 2026. This included two zero-day vulnerabilities in unspecified software. Astra is also equipped to use previously unknown vulnerabilities to achieve code execution in hardened browsers and develop privilege-escalation exploits for hardened operating-systems, if allowed to run without any safeguards. Given the dual-use nature of these tools – the capabilities that can help defenders find weaknesses faster can also be abused by bad actors to exploit them more easily – OpenAI said the version of Astra being released is limited to secure code review and patching, while refusing to comply