Anthropic's new Claude Mythos model, initially presented as a significant leap in cybersecurity capabilities, has been found to perform comparably to OpenAI's GPT-5.5 in recent tests. Researchers from the UK's AI Security Institute evaluated both models on cybersecurity tasks, finding GPT-5.5 achieved similar or slightly better results, suggesting Mythos's prowess may stem from general model improvements rather than specific cybersecurity breakthroughs. This comes as Anthropic reports substantial revenue growth, while a New Yorker exposé casts doubt on Sam Altman's trustworthiness. AI
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IMPACT Suggests that specialized cybersecurity breakthroughs in models may be less common than general capability improvements.
RANK_REASON New research from the AI Security Institute compares the cybersecurity capabilities of two frontier models.
