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OpenAI’s GPT-5.5 is as Good as Mythos at Finding Security Vulnerabilities

UK evaluation confirms commercially available AI models now match specialized vulnerability discovery tools, democratizing code audit capabilities for both defenders and attackers.

Summary written by editorial AI · Source link below

Filed by Schneier on Security1 min readRead at source ↗

The UK’s AI Security Institute evaluated GPT-5.5’s ability to find security vulnerabilities, and found that it is comparable to Claude Mythos. Note that the OpenAI model is generally available. Here is the Institute’s evaluation of Mythos. And here is an analysis of a smaller, cheaper model. It requires more scaffolding from the prompter, but it is also just as good.

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