OpenAI API listings show gpt-6-astra slug as company readies Astra after Critical cyber rating

The identifier gpt-6-astra has been observed in OpenAI API surfaces, including routing-related listings, while the Responses API returns HTTP 404 for that slug rather than the 400 given to unrecognized names—behavior also seen for known reserved identifiers such as GPT-5.6 Cyber. The model is not publicly callable. OpenAI has separately said it plans to make Astra available soon after rating it the first system to meet the Critical cybersecurity threshold under its Preparedness Framework.