US EditionAmid Mythos' Hyped Cybersecurity Prowess, Researchers Find GPT-5.5 Is Just as Good
10 Articles
10 Articles
Amid Mythos' hyped cybersecurity prowess, researchers find GPT-5.5 is just as good
Last month, Anthropic made a big deal about the supposedly outsize cybersecurity threat represented by its Mythos Preview model, leading the company to restrict the initial release to “critical industry partners.” But new research from the UK's AI Security Institute (AISI) suggests that OpenAI's GPT-5.5, which launched publicly last week, reached "a similar level of performance on our cyber evaluations" as Mythos Preview, which the group evaluat…
GPT-5.5 Matches Mythos: AI’s Cyber Prowess Forces New Security Reckoning
A UK government body has tested OpenAI’s latest model and found it neck-and-neck with Anthropic’s closely held Mythos in cybersecurity skills. The Information reported the evaluation from the AI Security Institute (AISI), noting GPT-5.5’s performance puts it roughly on par with a model Anthropic deems too potent for broad release. Released just weeks ago, GPT-5.5 already handles complex tasks with less guidance. But its cyber chops stand out. AI…
Recently, rumors have circulated online that OpenAI's GPT-5.5 has caught up with Anthropic's Claude Mythos Preview. While there is supporting data, it cannot be definitively stated that GPT-5.5 has completely surpassed it. The AI Security Institute (AISI) in the UK released its cybersecurity test results on April 30th, making GPT-5.5 the second AI model from AISI to successfully simulate a corporate network intrusion from start to finish. The te…
The British AISI has published what many feared: GPT-5.5 can execute cyberattacks without anyone taking his hand. And it does so at the level of Claude Mythos, who until now was the uncomfortable reference in this little contest of who scares the most. For those who have just landed: the AI Safety Institute (AISI) is the body of the United Kingdom that evaluates models of AI before and after its exit to the market. It does not sell smoke, does n…
hoffeldt.net
slashdot.orgGPT-5.5 matches heavily hyped Mythos Preview in new cybersecurity tests
New results suggest Mythos' cyber threat isn't "a breakthrough specific to one model." Link: https://arstechnica.com/ai/2026/05/amid-mythos-hyped-cybersecurity-prowess-researchers-find-gpt-5-5-is-just-as-good/ :Cat-A
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