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GPT-6 Astra

OpenAI's frontier flagship model featuring a 1.05M-token context window and 128k output, focused on autonomous computer operation and long-horizon tasks while being the first system to reach the Critical cybersecurity risk threshold under its Preparedness Framework.

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01OpenAI Releases GPT-6 Astra: 1.05M Context Enters Autonomous System Operation as Cyber Capabilities Reach Critical ThresholdOpenAI officially released its next-generation flagship model GPT-6 Astra on September 3, 2026. Featuring a 1,050,000 (1.05M) token context window and 128,000 (128K) output limit, Astra pivots toward end-to-end computer operation and autonomous workflows. Scoring 100% on ExploitBench, it is the first frontier model to trigger the Critical cybersecurity risk threshold under OpenAI's Preparedness Framework, prompting restricted access gates and blocking alignment monitoring.9/7/2026