Cyber risks sharpen as open-source AI closes gap with frontier models, UK AISI says
By Patricia Figueiredo ( June 4, 2026, 16:32 GMT | Insight) -- Open-source AI models could soon gain cyber capabilities similar to Anthropic’s Mythos and OpenAI’s GPT 5.5 Cyber, potentially complicating efforts by regulators and companies to respond to AI-powered cyber threats. Andrew Strait, a senior UK AI Security Institute official, said open-source models may be only five to seven months behind leading frontier systems. The warning comes as financial regulators are seeking more information about frontier AI models and as a growing list of financial firms gain access to Mythos.Open-source AI models are expected to catch up with the cybersecurity capabilities of Anthropic’s Mythos and OpenAI’s GPT 5.5 Cyber in a matter of months, a senior official at the UK AI Security Institute warned....
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