GPT-6 ASTRA
OpenAI GPT-6 Astra is the company's most capable broadly deployed model and the first to reach the Critical cybersecurity level under its Preparedness Framework. The system card said Astra is more robust to jailbreaks and prompt injections than GPT-5.6 Sol, but noted it is also better at controlling its own chain of thought and could evade monitors under adversarial conditions.