GPT-6 Astra
Language modelCard summarizedOur most capable model for the most demanding work.
Overview
OpenAI · 05Astra, front
GPT-6 Astra
Our most capable model for the most demanding work.
- Cost
- $10.00 in
- Context
- 1.05M
- Input / output
- $10.00 / $50.00
- Max output
- 128K
- Knows up to
- April 2026
- Released
- 3 Sep 2026
OpenAI's most capable broadly deployed model and its first to reach the Critical level of cybersecurity capability under the Preparedness Framework. OpenAI reports it is more robust to jailbreaks and prompt injection, and better aligned than GPT-5.6 Sol, but its chain of thought is harder to monitor. p.7–9
gpt-6-astra- Input / output per 1M
- $10.00 / $50.00
- Context window
- 1.05M
- Max output
- 128K
- Knows up to
- April 2026
- Reasoning
- Reasoning, always on (effort low → max)
- Weights
- Closed
About this card. A model card is the maker's own account of a model: what it's for, how it was trained and tested, and where it falls short. This page condenses OpenAI's GPT-6 Astra System Card. Every claim carries its source page.