OpenAI released GPT-6 Cyber on November 5. The model is a specialized version of GPT-6 Astra trained with reinforcement learning to find vulnerabilities, reproduce crashes, and develop exploits while staying inside authorized scope. OpenAI classified it Critical under its Preparedness Framework because it can identify and develop functional zero-day exploits in real-world systems.
On ExploitGym the model scored 48.5 percent. GPT-5.6 Cyber scored 32.1 percent on the same tests. In ExploitGym Honeypot tests without a deployment safety prompt, GPT-6 Cyber left out-of-scope services untouched in 99.93 percent of runs. GPT-5.6 Cyber did so in 94.49 percent of runs.
Researchers used the model to find 81 previously unknown high-severity vulnerabilities in Firefox and to develop working exploits for 948 Linux kernel vulnerabilities, including 588 previously unknown bugs. The Linux findings are being reported with potential patches.
GPT-6 Cyber is available only through the API and Codex to a select group of approved Daybreak Red customers. OpenAI will expand access to all Daybreak Red customers over the coming weeks and is also making GPT-5.6 Cyber available to the same group.