OpenAI rates its strongest cyber model Critical and limits access to vetted defenders

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OpenAI has classified its most capable cybersecurity model as Critical under its Preparedness Framework, the top tier, up from High for its previous cyber model. Access is restricted to approved defenders rather than released broadly. The move follows Google's decision eight days earlier to gate its Gemini 4 Carbon model to vetted users, suggesting restricted release is becoming a common approach. OpenAI reports a 99.93% safe-run rate without safety prompting, a figure it has not independently verified. The company also says the model found 81 previously unknown high-severity Firefox vulnerabilities, while Mozilla credits OpenAI with 41 high-severity fixes in one release.

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