UK AI Security Institute Benchmarks GPT-5.5's Vulnerability Discovery Prowess
The UK's **AI Security Institute** recently assessed **GPT-5.5**'s capabilities in identifying security vulnerabilities. The findings suggest its performance is on par with **Claude Mythos**, marking a significant advancement in AI-driven cybersecurity analysis. Interestingly, the tested **OpenAI** model is generally available.
The **AI Security Institute** in the UK has published its evaluation of **GPT-5.5**'s ability to detect security vulnerabilities, revealing its capabilities are comparable to those of **Claude Mythos**. This is according to their official report.
[Here](https://www.aisi.gov.uk/blog/our-evaluation-of-claude-mythos-previews-cyber-capabilities) is the Institute’s evaluation of Mythos.
An analysis of a smaller, more cost-effective model suggests that, with sufficient prompting and guidance, it can achieve similar results. The analysis can be found [here](https://aisle.com/blog/ai-cybersecurity-after-mythos-the-jagged-frontier).