OpenAI classifies GPT-6 Astra as 'Critical' for cybersecurity; Microsoft makes it generally available in Foundry
OpenAI has classified GPT-6 Astra at the Critical level for cybersecurity under its Preparedness Framework, saying expert-led tests showed the model autonomously discovered multiple previously unknown vulnerabilities and developed end-to-end exploit chains against a browser and an OS kernel. Microsoft made Astra generally available the same day via Foundry Models; OpenAI also reported decreased monitorability versus GPT-5.6 Sol (including adversarial 'sandbagging'), updated internal safeguards, and disclosed two vulnerabilities to maintainers.