GPT-6 Astra can find zero-days on its own. OpenAI calls that ‘Critical.’
OpenAI this week shipped GPT-6 Astra, a model its president called a “generational leap,” with some executives suggesting — carefully, and with hedges attached — that it might be a first glimpse of artificial general intelligence. For the security community, the more consequential headline is buried a few paragraphs down: Astra is the first OpenAI model formally designated as reaching the “critical” cybersecurity threshold under the company’s preparedness framework.
It means OpenAI’s own testing found that, absent production safeguards, Astra can identify and exploit previously unknown vulnerabilities in hardened systems without a human walking it through each step. In other words: a model that can independently discover and weaponize zero-days.
The Numbers Behind the Threshold
OpenAI’s release materials lay out benchmark results that illustrate why the critical designation was triggered. On ExploitBench, a benchmark measuring whether a model can convert known vulnerabilities into working exploits, Astra reportedly hit a 100%...
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