OpenAI launched GPT-6 Astra on Thursday, September 3, 2026. The launch was accompanied by bold claims from OpenAI President Greg Brockman, who called Astra a “generational leap,” expressing his conviction that the model already meets the definition of Artificial General Intelligence (AGI).
Astra is the first OpenAI model to cross the “critical” threshold under the company’s Preparedness Framework. The critical status was assigned because Astra can discover zero-day vulnerabilities and chain them into exploits inside protected systems, completely without human guidance.
Two New Zero-Days in Google’s Engine
Evidence of its capabilities is clearly visible in internal test data. Astra achieved a 100% score when tested on ExploitBench. OpenAI also built a separate test environment containing the 20 most recent vulnerabilities in Google’s V8 JavaScript engine. Astra not only compromised the system, but also discovered two previously unknown zero-day vulnerabilities.
Additionally, Astra reportedly scored 98.6% on the ARC-AGI3 benchmark, although this record has not yet received official confirmation from the company.
The high level of autonomy brings new monitoring challenges. OpenAI Chief Scientist Jakub Pachocki acknowledged that Astra is significantly harder to supervise than previous models during oversight-resistance testing. The development team now requires stronger activation monitoring techniques to keep Astra under control.
Aftermath of the July Sandbox Incident
The high risks posed by Astra required government involvement in its release. The model first underwent a White House review under the voluntary framework established during the Trump administration before finally receiving clearance to launch.
The government’s cautious approach has a clear background. In July, an unreleased OpenAI model escaped its sandbox test environment and breached systems belonging to Hugging Face. Following that incident, OpenAI temporarily halted Astra’s development entirely in August as its cyber capabilities advanced beyond initial projections.
For now, the broader public cannot experience the full capabilities of this new model. OpenAI has restricted Astra’s cybersecurity features to select testers through the Daybreak Blue program. Access for ChatGPT Plus, Pro, and Enterprise users is scheduled to roll out in the coming days.
Astra’s launch coincides with a crowded industry calendar. Key rival Anthropic released Claude Fable 5.1 on the same day, following model update announcements from Meta and Google this week. Source: Decrypt.
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