OpenAI's own system card says GPT-6 Astra can find previously unknown security flaws in well-protected systems and exploit them without a human guiding each step. It is the first model to hit their Critical threshold for cyber capability. Today they gave that model its own computer, its own browser, access to 4,000+ apps, and instructions to keep working after you log off. The system card has a second finding that got less attention. Astra's monitorability went down. The model is better at…