GPT-6 Astra

GPT-6 Astra is the top model in OpenAI's GPT-6 family, released 2026-09-04. OpenRouter lists $10 per million input tokens and $50 output, with a 1,050,000-token context and text, image and PDF input. That is five times the input price of GPT-6 Sol and one hundred times Luna. It is closed and proprietary, with no weights to download. We would suggest it for tasks where answer quality outweighs cost, such as complex analysis or long agent runs that a smaller model has failed, and only after a cheaper model has been tried on the same work. The limit is price: a single large prompt can cost cents, and an agent loop can multiply that, so we advise setting spending caps and measuring cost per task before adopting it widely. Prices and specifications come from the OpenRouter listing we checked on 31 October 2026, and we have not tested the model ourselves.